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2020-10-07: DAAD funded research stay of scientists from Russia
We welcome in our group Dr. Natalia Shkodich (Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences) and Dr. Mikhail Cherkasskii (Saint Petersburg State University) who recently joined us for a 3 months research stay funded by DAAD scholarships ("Research stays for University Academics and Scientists, 2020" and "Dmitrij Mendeleev" Program).

Dr. Natalia Shkodich is an expert on combining High-Energy Ball Milling (HEBM) and Spark Plasma Sintering (SPS) to produce nanostructured and amorphous materials from immiscible metals (so-called pseudo alloys), metallic glasses, and high-entropy alloys (HEAs). She aims at producing novel nanostructured CoCrFeNiGa magnetic high entropy alloy (Mag HEA) particles and volume MagHEA materials with a large magnetization, high Curie temperature and tuneable coercivity as well as excellent mechanical properties.

Interests of Assoc. Prof. Dr. Mikhail Cherkasskii are focused on the understanding of magnetization nutation in ferromagnets and its coupling to precession and ferromagnetic resonance. He is working on the development of an analytical approach to describe inertial spin dynamics, nutation resonance and collective excitations in ferromagnets.
2020-07-24: New publication in AIP Advances - Editor's Pick!
Reversal of uniaxial magnetic anisotropy in Fe/GaAs (110) films driven by surface relaxation: An in situ ferromagnetic resonance study by Babli Bhagat et al.

Performing in situ studies of ferromagnetic resonance in thin metallic films in ultrahigh vacuum, we found a dramatic change of in-plane magnetic anisotropy in 4 nm Fe film grown on GaAs(110) substrate occurring after deposition. Initially grown, Fe/GaAs(110) film exhibits unusual uniaxial in-plane anisotropy which reverses its sign within 40 hours while the film is kept in vacuum at room temperature. The effect of surface contamination has been excluded using surface-sensitive techniques AES and LEED, which let us to conclude on metastability and ongoing surface relaxation of Fe film. This finding opens up a further study of such island-like grown metastable thin films where magneto-morphological transitions can be altered by temperature and other external stimuli.
2020-03-10: Non-standing spin-waves in confined micrometer-sized ferromagnetic structures under uniform excitation
Editors Pick (!) Non-standing spin-waves in confined micrometer-sized ferromagnetic structures under uniform excitation Appl. Phys. Lett. 116, 072401 (2020); Santa Pile et al. A long effort within an international collaboration (U. Linz, Duisburg-Essen, Stanford) including partners from the CRC/TRR 270 broke new ground in element-specific magnetic imaging with picosecond temporal and few nanometer spatial resolution. A non-standing characteristic of directly imaged spin-waves in confined micrometer-sized ultrathin Permalloy (Ni80Fe20) structures is reported along with evidence of the possibility to alter the observed state by modifications to the sample geometry.
2020-03-10: Dynamic unidirectional anisotropy in cubic FeGe with antisymmetric spin-spin-coupling
Nicolas Josten, et al. Scientific Reports 10, 2861, (2020) DOI: 10.1038/s41598-020-59208-8 Successful collaboration with TU-Darmstadt within CRC/TRR 270. We studied bulk polycrystalline B20 FeGe samples prepared in Darmstadt and measured ferromagnetic resonance spectroscopy. As a result we discovered strong (dynamical) unidirectional anisotropy. Such anisotropy is not present in static magnetometry measurements. B20 FeGe exhibits inherent Dzyaloshinskii-Moriya interaction, resulting in a nonreciprocal spin-wave dispersion. By X-band ferromagnetic resonance spectroscopy at 276 K  1 K, near the Curie temperature, a distribution of resonance modes was observed in accordance with the cubic anisotropy of FeGe. This distribution exhibits a unidirectional anisotropy, i.e. shift of the resonance field under field inversion, of KUD = 960 J/m3  10 J/m3, previously unknown in bulk ferromagnets. Additionally, more than 25 small amplitude standing spin wave modes were observed inside a micron sized FeGe wedge, measured at 293 K  2 K. These modes also exhibit unidirectional anisotropy. This effect, only dynamically measurable and not detectable in static magnetometry measurements, may open new possibilities for directed spin transport in chiral magnetic systems.
2020-01-17: Highlighted Publication
The publication based on our long term collaboration with the group of Vernica Salgueirio (university of Vigo, Spain) Shaping iron oxide nanocrystals for magnetic separation applications has been selected to be a part of a themed collection International Year of the Periodic Table: As attractive as magnets applications for magnetic materials. This themed collection is the seventh, and final, in a series celebrating the International Year of the Periodic Table. As Attractive as Magnets Applications for Magnetic Materials features papers from across the Materials and Nano journal portfolio; Materials Horizons, Nanoscale Horizons, Nanoscale, Nanoscale Advances and Journal of Materials Chemistry A, B & C. The papers selected for this themed issue focus on the current hot trends in the field of magnetic materials.
2019-11-26: Cooperate Research Center TRR 270 HoMMage
We celebrate the new Cooperate Research Center TRR 270 HoMMage "Hysteresis Design of Magnetic Materials for Efficient Energy Conversion".
Starting Jan 1st, 2020 we will design and develop magnetic materials for applications in electro mobility, robotics and energy converters over the first period till Dec. 31st , 2023. In our group we have three positions for Ph.D. students available on projects related to this programme (see separate announcements).
2019-09-26: Workshop SpinS-2019 gathers experts in nanomagnetism at the University of Duisburg-Essen

Next week, 2-4 October 2019, more than 40 experts in physics, chemistry and materials science from 12 countries meet in “Die Wolfsburg” Academy in Mülheim an der Ruhr/Duisburg to share their research results and discuss new concepts in nanomagnetism and its applications, like energy-efficient computing and magnetic refrigeration.

The Workshop program covers the most recent experimental and theoretical research developments related to spin phenomena in nanoscale systems as well as the design, properties and applications of magnetic nanomaterials. It includes several emergent technologies based on spin-orbit torques, ultrafast spin dynamics in THz frequency range, magnonics, magnetoacoustics as well as novel materials like shell-ferromagnets, MAX phases (including 2D MXenes), and nanohybrids for theranostics applications actively developed in the working group AG Farle. The SpinS-2019 provides an interdisciplinary platform for meeting the specialists in fabrication and imaging of 2D and 3D magnetic nanostructures, and experts working towards various application areas – from spin dynamics and magnetic memory to additive manufacturing and biomedicine.

The meeting is organized by Michael Farle, Katharina Ollefs and Anna Semisalova, with a technical support of Michael Vennemann and Sabina Grubba. Organizers highly appreciate the financial support of the Center for Nanointegration Duisburg-Essen (CENIDE).

SpinS-2019 website


2019-09-26: High Entropy Alloys: How to induce ferromagnetism?
High-entropy alloys are currently the focus of significant attention in materials science and engineering. Some HEAs have considerably better strength-to-weight ratios, with a higher degree of fracture resistance, tensile strength, as well as corrosion and oxidation resistance than conventional alloys. In the recent publication Mehmet Acet showed how to introduce strong magnetism in a Cr20Mn20Fe20Co20Ni20 high-entropy alloy. He could show through the thermal expansion properties that the alloy carries similar anti-Invar properties as FCC-Fe, but unlike FCC-Fe it is stable throughout its solid-state temperature range. Therefore, by exploiting the anti-Invar property and expanding the lattice of the alloy by introducing interstitial carbon, we make Cr20Mn20Fe20Co20Ni20 ferromagnetic with a Curie temperature lying above room temperature. For details see:
Picture from Von Shaoqing Wang - Wang, Shaoqing (13 December 2013). "Atomic Structure Modeling of Multi-Principal-Element Alloys by the Principle of Maximum Entropy". Entropy 15 (12): 55365548. DOI:10.3390/e15125536., CC BY 3.0,
2019-09-26: A novel concept for bio-inspired architectures
A novel concept for bio-inspired architectures in up-scalable, energy efficient computing is discussed in our recent publication "Biologically encoded magnonics". For details read here (
2019-05-20: Magnetite-Gold nanohybrids as ideal all-in-one platforms for theranostics
Maria V. Efremova, Victor A. Naumenko, Marina Spasova, Anastasiia S. Garanina, Maxim A. Abakumov, Anastasia D. Blokhina, Pavel A. Melnikov, Alexandra O. Prelovskaya, Markus Heidelmann, Zi-An Li, Zheng Ma, Igor V. Shchetinin, Yuri I. Golovin, Igor I. Kireev, Alexander G. Savchenko, Vladimir P. Chekhonin, Natalia L. Klyachko, Michael Farle, Alexander G. Majouga and Ulf Wiedwald

was published in Scientific Reports in July 2018 and is listed by the journal among the top 25 articles in the collection 'Chemistry Top 100' articles in 2018. This list is based on most highly accessed chemistry articles covering January-December 2018.
(DOI: 10.1038/s41598-018-29618-w |
2019-04-29: Energy Technology "Best of 2018"
Our review article "Hysteresis Design of Magnetocaloric Materials - From Basic Mechanisms to Applications" Franziska Scheibel, Tino Gottschall, Andreas Taubel, Maximilian Fries, Konstantin P. Skokov, Alexandra Terwey, Werner Keune, Katharina Ollefs, Heiko Wende, Michael Farle, Mehmet Acet, Oliver Gutfleisch, Markus E. Gruner, (Collaboration partners from TU Darmstadt and U. Duisburg-Essen)
published in Energy Technology in 2018 has been named one of the top articles of the year as the "Best of 2018".
This selection is based upon the download and citation numbers as well as the opinions and feedback of the editorial office of the journal.
Understanding hysteresis: Materials with magnetostructural phase transitions (MSPT) show a large magnetocaloric effect (MCE). The understanding of MSPT and its thermal hysteresis requires the knowledge about the electronic, magnetic, and lattice entropy contributions. In this Review, we provide an overview of the properties of MSPT in La-Fe-Si, Heusler alloys, Mn3GaC, and Fe2P‐type materials with respect to the MCE and its reversibility based on studies under static/dynamic conditions at micro‐ and mesoscopic scales.
2019-04-10: MA PhD Focus Session Biogenic Spin Phenomena, DPG SKM Spring Meeting, Regensburg, March 31- April 5, 2019
The PhD Focus session Biogenic Spin Phenomena, which was organized by Ph.D. students from the group of M. Farle, H. Wende and T. Weels from FZ Jlich, assembled a group of prominent experts to share insights and perspectives of Biomagnetism. The symposium with about 80 participant and funded by the DPG was successful and established new links between research groups.

The picture shows: Front row: Prof. M. Winklhofer, Prof. C. Monzel, Prof. R. Dunin-Borkowski, Prof. G. V. Kurlyandskaya; Back row: Prof. M. Farle, I. Iglesias, T. Weels, Th. Feggeler, N. Rothenbach, I. Novoselova, B. Zingsem. We thank all speakers for their excellent contribution and an extraordinary panel discussion. For us, PhD students, the organization of the event was a great experience. We are very grateful to the DPG, the jDPG, the University of Duisburg-Essen, and the Forschungszentrum Jlich for enabling this experience. In particular, we would like to acknowledge the Center of Nanointegration of Duisburg-Essen University CENIDE for financial support.

Organization Committee:
  • Iuliia Novoselova (
  • Thomas Feggeler (
  • Irene Iglesias (
  • Nico Rothenbach (
  • Teresa Weels (
  • Benjamin Zingsem (
  • 2019-04-10: MA Focus Session Magnetic Materials for Energy Efficient Applications, SKM Spring Meeting, Regensburg, March 31- April 5, 2019
    Coordinators:Katharina Ollefs (, Franziska Scheibel (
    The focus session which was organized by Franziska Scheibel and Katharina Ollefs turned out to be a success after having been selected by the biggest Magnetism Association ("Fachverband Magnetismus" of DPG) of the world as one of its 5 Focus session in 2019.
    High performance magnetic materials are at the heart of many energy-related technologies, such as direct drive wind turbines and e-mobility. They are also important in robotics and automatization, sensors, actuators, and information technology as well as in solid state-based refrigeration. All of these technologies are expected to grow significantly in the next decades and especially, so-called green energy technologies are likely to see an exponential increase. Several international experts in the field of permanent magnets and magnetocalorics reported on different aspects of magnetic materials:
    Microstructure optimization for rare-earth efficient permanent magnets (Thomas Schrefl)
  • Advanced methods for the development of high performance hard and soft magnetic materials (Dagmar Goll)
  • Compositionally graded films as model systems to study magnetic materials for energy applications (Nora Dempsey)
  • Dissecting the magneto-structural transformation in materials with first-order field-induced transitions (Konstantin Skokov)

  • The Organizers thank for the support by the Sektion Kondensierte Materie of the Deutsche Physikalische Gesellschaft.
    2019-03-18: 69th Lindau Nobel Laureate Meeting (30 June5 July 2019) with Iuliia Novoselova and Benjamin Zingsem
    Only 600 young scientists from around the world are invited to participate at the 69th Lindau Nobel Laureate Meeting ( ) dedicated to physics . They have the chance to meet and discuss with 41 Nobel Laureates including the 2018 laureates in physics Donna Strickland and Grard Mourou.
    Congratulations to our Group Members !!!
    2019-03-05: Neue Mitarbeiterin: Dr. Anna Semisalova

    New colleague: Dr. Anna Semisalova
    We welcome Dr. Anna Semisalova as a new colleague and Habilitation candidate in our group.
    Anna brings a DFG-funded project to the University of Duisburg-Essen and is looking for students for bachelor or master theses on topics related to spin dynamics and magnonics.
    Also, a PhD position for investigation of magnetization dynamics in nanostructures is available.

    2019-03-04: PhD students organizing PhD focus session
    Magnetism in Biology and Medicine

    Young scientists at the University Duisburg-Essen, RWTH Aachen and the Forschungszentrum Jlich organize a symposium at Europes largest physics congress. Participants of the DPG meeting in Regensburg are encouraged to join the symposium on 3rd April, 2019. No further registration is required.

    The invited talks will cover innovative discoveries ranging from theranostic (theranostics = combination of therapy and diagnostics) over biogenic to bioinspired research areas, featuring renowned scientists from Europe and the US:
  • Prof. Dr. Kannan M. Krishnan (University of Washington, USA)
  • Prof. Dr. Galina V. Kurlyandskaya (University of the Basque Country, Spain)
  • Prof. Dr. Cornelia Monzel (Heinrich-Heine University Dsseldorf, Germany)
  • Prof. Dr. Michael Winklhofer (Carl von Ossietzky University of Oldenburg, Germany)

  • The topic of the symposium revolves around magnetism in biomedical applications, magnetic materials for biodetection, biomimetics and spin dynamics of individual biogenic magnetic nanoassemblies.
    The symposium will conclude with a panel discussion, aiming to allow participants to get in contact with the experts and formulate future perspectives for Biomagnetism. Prof. Dr. Michael Farle kindly agreed to moderate the panel.

    Further information can be found here.

    Organizing committee
    We are PhD students:
    Iuliia Novoselova (University of Duisburg-Essen and CENIDE)
    Thomas Feggeler (University of Duisburg-Essen and CENIDE)
    Irene Iglesias (University of Duisburg-Essen and CENIDE)
    Nico Rothenbach (University of Duisburg-Essen and CENIDE)
    Teresa Weels (Forschungszentrum Jlich and RWTH Aachen University)
    Benjamin Zingsem (University of Duisburg-Essen and CENIDE and Forschungszentrum Jlich)
    2019-01-22: Dr. Merivan Sasmaz from Adiyaman University in our group
    We welcome Dr. Merivan Sasmaz from the Physics Department, Adiyaman University, Turkey in our group.
    She successfully completed a DAAD sponsored project working in our group for two months. Now, she received a one year research grant from TUBITAK (Turkish Research Foundation) for the "Investigation of the effects of magnetic proximity effect on the magnetocaloric properties of Ni-Mn based Heusler alloys" We congratulate her on her success with DAAD and TUBITAK and look forward to a fruitful collaboration.
    2017-09-01: Ulf Wiedwald ist Gastprofessor in Moskau
    (c) NUST In 2017 and 2018, PD Dr. Ulf Wiedwald will temporarily exchange the Salvatorkirche for the St. Basil's Cathedral and the Magic Mountain for the Red Square: He prevailed in an international competition and has been appointed as visiting professor at the renowned National University of Science and Technology (NUST) MISiS in Moscow, Russia.

    Wiedwald has been cooperating with Prof. Alexander Majouga and Dr. Maxim Abakumov from the "Biomedical Nanomaterials Laboratory" and Prof. Alexander Savchenko from the Department of Physical Materialogy in NUST MISiS for a long time now. Together, they have been working on particles for theranostics: magnetic nanomaterials, which can simultaneously be used for the diagnosis and therapy of cancer diseases.
    For a period of three weeks each, the physicist will be visiting NUST MISiS twice, in 2017 and 2018. In addition to research, teaching and working on the joint project will be on the agenda.
    Wiedwald is particularly interested in the cooperation for two aspects: "For a successful implementation of our project, we have to combine different research disciplines, which I find very enriching. Moreover, I am looking forward to learn more about the Russian culture and mentality, which I have already appreciated during my previous visits."
    Further information: PD Dr. Ulf Wiedwald, 0203 379-2633
    Redaktion: Birte Vierjahn, 0203 379-8176
    2017-06-28: Breakthrough in forming Fe containing MAX Phases
    The first Fe-based MAX phase is realized by solid-state substitution reaction of an Fe/Au/Mo2GaC. Chemical analysis together with elemental mapping reveals that as much as 50 at.% Fe on the A site can be obtained by thermally induced Au and Fe substitution for Ga atomic layers in Mo2GaC. This finding is an important step towards synthesizing oxidation and wear resistant, nanoscale laminated magnetic MAX Phases with large magnetization and higher Curie temperature.
    Breakthrough in forming Fe containing MAX Phases
    For details see Chung-Chuan Lai et al.
    2016-10-31: Michael Farle is one of four recipients of the 2017 Distinguished Lecturer Awards
    Michael Farle is one of the four recipients of the 2017 Distinguished Lecturer Awards of the IEEE Magnetics Society. The price money (20.000 US$ ) is intended to cover travel expenses for lectures around the globe in 2017 (Details).
    2016-06-07: 07.06.2016 DFG Projekt SA 3095/2-1
    Wir gratulieren unserem Mitarbeiter Dr. Ruslan Salikhov zur erfolgreichen Einwerbung eines DFG Projektes zum Thema: Magnetische Anisotropie und Relaxation in einer neuen Materialklasse: Nanolaminierte magnetische MAX Phasen. Das dreijhrige Forschungsvorhaben, welches am 1.7.2016 beginnt, wird mit einer Gesamtsumme von rund 280.000 gefrdert. Wir freuen uns mit ihm und feiern !!! Anfragen bezglich Master oder Bachelorarbeiten sind willkommen. Weitere Infos:
    2016-06-07: 07.06.2016 Alexander von Humboldt (AvH) Forschungspreistrger Kannan Krishnan
    Seit dem 7.6.2016 ist Prof. Kannan Krishnan von der University of Washingthon in unserer Arbeitsgruppe. Er wird zunchst fr zwei Monate bei uns sein und uns mit Rat und Tat in den Forschungsaktivitten unserer Arbeitsgruppe begleiten. Eine Rckkehr fr den Herbst und im nchsten Jahr ist geplant. Zusammen mit AvH Forschungspreistrger Prof. Dieter Weller, der seit Anfang des Jahres bei uns ist, freuen wir uns auf die internationale Expertise der internationalen Kollegen vertrauen zu drfen. Anfragen bzgl. Bachelor- und Masterarbeiten sind willkommen.
    2016-04-29: 01.04.2016 Auf in die Industrie: Dr. Sara Liebana-Vinas geht zu Evonik
    Nach Ihrer erfolgreichen Promotion mit internationaler Betreuung im Grenzgebiet zwischen kolloidaler Chemie und Nano-Festkrperphysik verlies uns Sara, um in der Industriellen Projektentwicklung bei EVONIK Ihr Glck zu suchen. Wir bedauern Ihren Weggang und wnschen alles Gute. Hasta Luego !
    2016-04-29: 01.03.2016 Auf in die Promotion: M.Sc. Nanoeng. Alexandra Terwey und M.Sc. Sabrina Masur
    Nach erfolgreichem Abschluss Ihrer Masterarbeiten in unserer Arbeitsgruppe haben Sabrina und Alexandra problemlos Promotionsstellen gefunden. Sabrina wird an der University of Cambridge und Alexandra in der Arbeitsgruppe Wende ihre Promotionsprojekte durchfhren. Alles Gute und bis bald mal wieder !
    2016-02-10: 05.02.2016 Publikationen der AG Farle
    Wir freuen uns, dass unsere Publikationen auch wieder in der letzten Woche (wie in den letzten 20 Wochen) zu denen der Fakultt Physik gehrte, die international auf der Internet Plattform Researchgate das grte Interesse (most downloaded) fanden.
    2015-11-25: 22.11.2015 Verleihung des Forschungspreises der Alexander von Humboldt Stiftung an Dr. D. Weller
    Dr. Dieter Weller from Hitachi Global Storage, Western Digital, and University of York, United Kingdom is well known internationally for his outstanding research in magnetic data storage media, permanent magnets and experimental work on the atomistic understanding of macroscopic parameters like magnetic anisotropy and magnetization in novel magnetic thin film structures. He was among the first to introduce the concept of using colloidal nanoparticles as possible magnetic single bits in magnetic media opening a pathway to Terrabit/inch storage densities. During his stay in Germany in 2016, he intends to bring his expertise to the synthesis and better understanding of a novel magnetic material called MAX phases and also to magnetic materials useful for applications in magnetic cooling. Dr. Dieter Weller will be hosted by Professor Michael Farle at the University of Duisburg Essen.
    2015-10-05: Sabrina Masur erringt Auszeichnung
    Auf der "International Baltic Conference on Magnetism: Focus on Biomedical Aspects" in Svetlogorsk (Kaliningrad), Russia, gewinnt Sabrina Masur den "Best Poster Presentation Award" fr Ihren Beitrag "CHARACTERISATION OF FUNCTIONALYSED IRONOXIDE NANOPARTICLES BY MAGNETIC RESONANCE MEASUREMENTS". Wir gratulieren !
    2013-02-21: Vacant PhD position
    We offer a PhD position in Nanomagnetism. For details see PDF.
    2012-11-07: New open Bachelor- / Masterpositions
    We offer new Bachelor- and Masterpositions. For Details see Jobs.
    2012-03-08: G.-D.-Baedeker-Preis 2012: Andreas Ney
    Andreas Ney Prof. Dr. Andreas Ney, der zum 1.2.2012 die Professur fr Festkrperphysik an der Johannes Kepler-Universitt in Linz (sterreich) angetreten hat, erhlt den mit 5.000 Euro dotierten Gottschalk-Diederich-Baedeker-Preis fr seine herausragende Habilitation. Die Preisverleihung findet am 25.05.2012, 17:00 am Campus Essen statt. Wir gratulieren und freuen uns mit ihm ber diese Auszeichnungen und auf die zuknftige weitere Zusammenarbeit !

    2012-02-16: Faszinierende Physik
    Ferrofluidbrunnen begeistert bei youtube in ber 27.000 Aufrufen

    Das Physik nicht nur spannend ist, sondern auch faszinierende Bilder hervorbringt, zeigt der von Florian Rmer aus der AG Farle fr CeNIDE konstruierte Ferrofluidbrunnen.
    Die schwarze Flssigkeit besteht aus in l dispergierten winzigen Eisenpartikeln mit einem Durchmesser von je rund 10 Nanometern.
    Welche Formen das Fluid in einem Magentfeld annehmen kann, zeigt ein youtube Video, welches allein im vergangenen Dezember 16.000 Nutzer aufgerufen haben.
    Zur Meldung auf der CeNIDE-Webseite geht es hier.
    Das Video direkt bei youtube ansehen.
    2011-04-21: Master-positions available
    We offer positions for research projects to students of physics and nanoengineering on an exciting topic using sophisticated experimental techniques:
    - Mechanical, magnetic and transport properties of nanostructures (nanowires, nanoparticles and nanotubes) studied by in-situ Transmission Electron Microscopy (TEM). See PDF for details.
    2009-06-29: Bachelor-, Masterarbeiten zu vergeben / Bachelor-, Master-positions available
    We offer positions for research projects to students of physics, nanoengineering, materials science or related subjects:
    - Magnetic nanoparticles: Dipolar interactions, element-specific magnetism and manipulation
    - Magnetic nanoparticles: Three-dimensional imaging of composition and shape by Transmission electron microscopy
    - Magnetic Colloids: Understanding the interface to bio systems
    - Magnetic colloids: Creating and manipulating bi-functional particles with optical and magnetic functionality.
    Details: PDF
    2009-04-09: WEH Best Poster Prize fr Igor Barsukov

    Igor Barsukov Magnetische Relaxation in dnnen Schichten
    Im Rahmen des Wettbewerbs am 429. WE-Heraeus-Seminar in Bad Honnef "Microwaves for Condesed Matter Physics" gewann Igor Barsukov diesen Preis fr sein Poster mit dem Titel "Relaxation channels in iron based thin films". Es handelt von Magnetisierungsdynamik unter Bercksichtigung von intrinsischen und extrinsischen Relaxationsprozessen. Die Ergebnisse stellen einen wichtigen Schritt auf dem Weg zum Verstndnis und zur Modellierung von Symmetrie und Intensitt der magnetischen Dmpfung dar.
    2008-04-28: Invited Review Article: "Microwave spectroscopy based on scanning thermal microscopy: Resolution in the nanometer range" by R. Meckenstock published
    Scanning thermal microscope-detected ferromagnetic resonance (SThM-FMR) combines a thermal near-field microscope with a FMR spectrometer and detects the thermal response due to resonant microwave absorption by measuring the resistivity change in the thermal nanoprobe. The advantage of this technique is to provide imaging capabilities at fixed resonance conditions as well as local microwave spectroscopy at the nanoscale. A technique that uses the same setup but detects the thermoelastic response of the sample is the scanning thermoelastic microscope-detected FMR (SThM-FMR) This latter technique is advantageous when FMR spectra of single nanostructures have to be recorded at a fixed position. The experimental setups and the signal generation processes of SThM/SThEM-FMR are described in detail. With the SThM-FMR setups a temperature resolution of 1 mK and a local resolution of 30 nm are actually achieved. With SThEM-FMR the obtained local resolution is 10 nm. The detection limits of both techniques can be as low as 106 spins. To demonstrate the potential of these new techniques SThM/SThEM-FMR investigations of local magnetic anisotropies, magnetization dynamics of single nanodots and inhomogeneous FMR excitations due to finite size effects are presented. Simultaneously, information on the magnetic parameters, the topography, and the thermal properties is provided. To describe the further potential of this recently developed SThM-FMR technique, combined magnetoresistance and FMR investigations are presented and an outlook on possible future applications is given. © 2008 American Institute of Physics. DOI: 10.1063/1.2908445
    2008-01-04: Review Article "Magnetic Anisotropy of Heterostructures" by J. Lindner and M. Farle published
    This book chapter provides a detailled introduction to magnetic anisotropy of ferromagnetic ultrathin films and multilayers and its analysis by ferromagnetic resonance on a tutorial level. Additionally, recent results for interface magnetic anisotropies of Ni on Cu, Fe on GaAs (001) and on MgO (001) are discussed.
    Reference: J. Lindner and M. Farle Magnetic Anisotropy of Heterostructures in Advances and Perspectives in Spinstructures and Spintransport, Series: Springer Tracts in Modern Physics , Vol. 227 Zabel, H.; Bader, Samuel D (Eds.) 2008, ISBN: 978-3-540-73461-1
    2008-01-10: Giant surface relaxation at FePt nanoparticle surface:
    The lattice spacing of (111) planes in the surface region of icosahedral FePt nanoparticles was found to expand by as much as 9% with respect to the bulk value of Fe52Pt48. Controlled removal of the (111) surface layers in situ results in a similar outward relaxation of the new surface layer. This unusually large layerwise outward relaxation is discussed in terms of preferential Pt segregation to the surface forming a Pt enriched shell around a Fe-rich Fe/Pt core. (for details see Phys. Rev. Lett. 100 (2008) 017205)
    2007-12-11: English Homepage Navigation
    The english language button is now working again.