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Struktur und Magnetismus nanoskaliger Systeme
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Das Verständnis magnetischer Eigenschaften von nanostrukturierten Materialien ist unsere Herausforderung !
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News
2020-11-10: Neue AG Mitglieder
2020-10-07: DAAD funded research stay of scientists from Russia
2020-09-15: Auszeichnung für Priv.-Doz. Dr. Ulf Wiedwald und Kollegen Mageschneiderte Winzlinge gegen den Krebs Ihre Nanopartikel aus Gold und Magnetit haben sie speziell für die Diagnose und Therapie von Tumoren entwickelt: Physiker vom Center for Nanointegration (CENIDE) der Universität Duisburg-Essen (UDE) und Moskauer Kollegen werden am 15. September für ihre erfolgreiche Zusammenarbeit ausgezeichnet (CENIDE: News). 2020-07-24: New publication in AIP Advances - Editor's Pick!
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); https://doi.org/10.1063/1.5139881 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. |