Staff

Name: Dr. Tom Kammermeier
Mail address:

Dissertation:
Structural and magnetic investigation of dilute magnetic semiconductors based on GaN and ZnO

Publikationsliste von Dr. Tom Kammermeier
2012
25 - Structural and magnetic analysis of epitaxial films of Gd-doped ZnO
V. Ney, S. Ye, T. Kammermeier, K. Ollefs, F. Wilhelm, A. Rogalev, S. Leb�gue, A. L. da Rosa, and A. Ney
Phys. Rev. B 85, 235203 (2012) DOI: 10.1103/PhysRevB.85.235203
24 - Effects of the Inhomogenous Co Doping on the Magnetoresistance of Zn1−xCoxO Epitaxial Films
S. Ye, L. Klar, A. Ney, V. Ney, T. Kammermeier, K. Ollefs, F. Liu and G. Wang
Journal of Nanoscience and Nanotechnology 2, 1054 (2012) DOI: 10.1166/jnn.2012.4266
2011
23 - Structural, chemical and magnetic properties of secondary phases in Co-doped ZnO
A. Ney, A. Kov�cs, V. Ney, S. Ye, K. Ollefs, T. Kammermeier, F. Wilhelm, A. Rogalev and R. E. Dunin-Borkowski
New J. Phys. 13, 103001 (2011) DOI: 10.1088/1367-2630/13/10/103001
2010
22 - Co-Doped ZnO Epitaxial Films: From a Brillouin-Like Paramagnet to a Phase-Separated Superparamagnetic Ensemble
V. Ney, S. Ye, K. Ollefs, T. Kammermeier, F. Wilhelm, A. Rogalev, and A. Ney
J. Nanosci. Nanotechnol. 10, 5958 (2010) DOI: 10.1166/jnn.2010.2590
21 - Magnetism of Co doped ZnO with Al codoping: Carrier-induced mechanisms versus extrinsic origins
A. Ney, V. Ney, S. Ye, K. Ollefs, T. Kammermeier, T. C. Kaspar, S. A. Chambers, F. Wilhelm and A. Rogalev
Phys. Rev. B 82, 041202(R) (2010) DOI: 10.1103/PhysRevB.82.041202
20 - Influence of the developing magnetic order on the transport properties of epitaxial Zn_1-xCo_xO films
S. Ye, V. Ney, T. Kammermeier, K. Ollefs, S. Zhou, H. Schmidt, A. Ney
J. Phys.: Conference Series 200, 052034 (2010) DOI: 10.1088/1742-6596/200/5/052034
19 - Anisotropic paramagnetism of Co-doped ZnO epitaxial films
A. Ney, T. Kammermeier, K. Ollefs, S. Ye, V. Ney, T. C. Kaspar, S. A. Chambers, F. Wilhelm and A. Rogalev
Phys. Rev. B 81, 054420 (2010) DOI: 10.1103/PhysRevB.81.054420
18 - Advanced spectroscopic synchrotron techniques to unravel the intrinsic properties of dilute magnetic oxides: the case of Co:ZnO
A. Ney, M. Opel, T. C. Kaspar, V. Ney, S. Ye, K. Ollefs, T. Kammermeier, S. Bauer, K.-W. Nielsen, S. T. B. Goennenwein, M. H. Engelhard, S. Zhou, K. Potzger, J. Simon, W. Mader, S. M. Heald, J. C. Cezar, F. Wilhelm, A. Rogalev, R. Gross and S. A. Chambers
New J. Phys. 12, 013020 (2010) DOI: 10.1088/1367-2630/12/1/013020
17 - Tuning the magnetic properties of Zn_1-xCo_xO films
V. Ney, S. Ye, T. Kammermeier, K. Ollefs, A. Ney, T.C. Kaspar, S.A. Chambers, F. Wilhelm and A. Rogalev
J. Magn. Magn. Mater. 322, 1232 (2010) DOI: 10.1016/j.jmmm.2009.04.024
16 - Gd-doped GaN studied with element specifity: very small polarization of Ga, paramagnetism of Gd and the formation of magnetic clusters
A. Ney, T. Kammermeier, K. Ollefs, V. Ney, S. Ye, S. Dhar, K. H. Ploog, M. R�ver, J. Malindretos, A. Rizzi, F. Wilhelm, A. Rogalev
J. Magn. Magn. Mater. 322, 1162 (2010) DOI: 10.1016/j.jmmm.2009.06.033
15 - Observation of the Onset of Magnetic Clustering in Superparamagnetic Zn_1-xCo_xO Films
S. Ye, V. Ney , T. Kammermeier, K. Ollefs, A. Ney, F. Wilhelm and A. Rogalev
J. Supercond. Nov. Magn. 23, 91 (2010) DOI: 10.1007/s10948-009-0566-6
2009
14 - Absence of ferromagnetic-transport signatures in epitaxial paramagnetic and superparamagnetic Zn_0.95Co_0.05O films
S. Ye, V. Ney, T. Kammermeier, K. Ollefs, S. Zhou, H. Schmidt, F. Wilhelm, A. Rogalev, and A. Ney
Phys. Rev. B 80, 245321 (2009) DOI: 10.1103/PhysRevB.80.245321
13 - Nonferromagnetic nanocrystalline ZnO:Co thin films doped with Zn interstitials
Christoph Knies, Matthias T. Elm, Peter J. Klar, Jan Stehr, Detlev M. Hofmann, Nikolai Romanov, Tom Kammermeier, and Andreas Ney
J Appl. Phys. 105, 073918 (2009) DOI: 10.1063/1.3095469
12 - Element specific measurements of the structural properties and magnetism of Co_xZn_1-xO
T. Kammermeier, V. Ney, S. Ye, K. Ollefs, T. C. Kaspar, S. A. Chambers, F.Wilhelm, A. Rogalev, and A. Ney
J. Magn. Magn. Mater. 321, 699 (2009) DOI: 10.1016/j.jmmm.2008.11.028
2008
11 - Structural, Magnetic and Optical Properties of Co- and Gd-implanted ZnO(0001) substrates
V. Ney, S. Ye, T. Kammermeier, A. Ney, H. Zhou, J. Fallert, H. Kalt, F.-Y. Lo, A. Melnikov, and A. D. Wieck
J. Appl. Phys. 104, 083904 (2008) DOI: 10.1063/1.3000452
10 - Metastable magnetism and memory effects in dilute magnetic semiconductors
A. Ney, R. Rajaram, T. Kammermeier, V. Ney, S. Dhar, K. H. Ploog and S. S. P. Parkin
J. Phys.: Condens. Matter 20, 285222 (2008) DOI: 10.1088/0953-8984/20/28/285222
9 - Limitations of measuring small magnetic signals of samples deposited on a diamagnetic substrate
A. Ney, T. Kammermeier, V. Ney, K. Ollefs, and S. Ye
J. Magn. Magn. Mater. 320, 3341 (2008) DOI: 10.1016/j.jmmm.2008.07.008
8 - Element specific magnetic properties of Gd:GaN: very small polarization of Ga and paramagnetism of Gd
A. Ney, T. Kammermeier, V. Ney, S. Ye, K. Ollefs, E. Manuel, S. Dhar, K. H. Ploog, E. Arenholz, F. Wilhelm, and A. Rogalev
Phys. Rev. B 77, 233308 (2008) DOI: 10.1103/PhysRevB.77.233308
7 - Paramagnetic and ferromagnetic resonance studies on dilute magnetic semiconductors based on GaN
T. Kammermeier, S. Dhar , V. Ney, E. Manuel, A. Ney, K. H. Ploog, F.-Y. Lo, A. Melnikov, A. D. Wieck
phys. stat. sol. (a) 205 (8), 1872 (2008) DOI: 10.1002/pssa.200824023
6 - Absence of intrinsic ferromagnetic interactions of isolated and paired Co dopant atoms in Zn_1-xCo_xO with high structural perfection
A. Ney, K. Ollefs, S. Ye, T. Kammermeier, V. Ney, T. C. Kaspar, S. A. Chambers, F. Wilhelm, and A. Rogalev
Phys. Rev. Lett. 100, 157201 (2008) DOI: 10.1103/PhysRevLett.100.157201
2007
5 - Experimental investigation of the metastable magnetic properties of Cr-doped InN
A. Ney, R. Rajaram, S.S.P. Parkin, T. Kammermeier, S. Dhar
Phys. Rev. B 76, 035205 (2007) DOI: 10.1103/PhysRevB.76.035205
4 - Magnetic and structural properties of Gd-implanted zinc-blende GaN
F.-Y. Lo, A. Melnikov, D. Reuter, A. D. Wieck, V. Ney, T. Kammermeier, A. Ney, J. Sch�rmann, S. Potthast, D. J. As, and K. Lischka
Appl. Phys. Lett. 90, 262505 (2007) DOI: 10.1063/1.2753113
3 - Element specific investigations of the structural and magnetic properties of Gd:GaN
A. Ney, T. Kammermeier, E. Manuel, V. Ney, S. Dhar, K.H. Ploog, F. Wilhelm, and A. Rogalev
Appl. Phys. Lett. 90, 252515 (2007) DOI: 10.1063/1.2750542
2006
2 - Magnetic properties of epitaxial CrN films
A. Ney, R. Rajaram, S. S. P. Parkin, T. Kammermeier, S. Dhar
Appl. Phys. Lett. 89, 112504 (2006) DOI: 10.1063/1.2352795
1 - Ferromagnetism and colossal magnetic moment in Gd-focused ion-beam-implanted GaN
S. Dhar, T. Kammermeier, A. Ney, L. Perez, K. H. Ploog, A. Melnikov, and A. D. Wieck
Appl. Phys. Lett. 89, 062503 (2006) DOI: 10.1063/1.2267900

	Name: Dr. Tom Kammermeier Mail address: Dissertation: Structural and magnetic investigation of dilute magnetic semiconductors based on GaN and ZnO
Publikationsliste von Dr. Tom Kammermeier
2012

25 - Structural and magnetic analysis of epitaxial films of Gd-doped ZnO
V. Ney, S. Ye, T. Kammermeier, K. Ollefs, F. Wilhelm, A. Rogalev, S. Leb�gue, A. L. da Rosa, and A. Ney
Phys. Rev. B 85, 235203 (2012) DOI: 10.1103/PhysRevB.85.235203

24 - Effects of the Inhomogenous Co Doping on the Magnetoresistance of Zn1−xCoxO Epitaxial Films
S. Ye, L. Klar, A. Ney, V. Ney, T. Kammermeier, K. Ollefs, F. Liu and G. Wang
Journal of Nanoscience and Nanotechnology 2, 1054 (2012) DOI: 10.1166/jnn.2012.4266
2011

23 - Structural, chemical and magnetic properties of secondary phases in Co-doped ZnO
A. Ney, A. Kov�cs, V. Ney, S. Ye, K. Ollefs, T. Kammermeier, F. Wilhelm, A. Rogalev and R. E. Dunin-Borkowski
New J. Phys. 13, 103001 (2011) DOI: 10.1088/1367-2630/13/10/103001
2010

22 - Co-Doped ZnO Epitaxial Films: From a Brillouin-Like Paramagnet to a Phase-Separated Superparamagnetic Ensemble
V. Ney, S. Ye, K. Ollefs, T. Kammermeier, F. Wilhelm, A. Rogalev, and A. Ney
J. Nanosci. Nanotechnol. 10, 5958 (2010) DOI: 10.1166/jnn.2010.2590

21 - Magnetism of Co doped ZnO with Al codoping: Carrier-induced mechanisms versus extrinsic origins
A. Ney, V. Ney, S. Ye, K. Ollefs, T. Kammermeier, T. C. Kaspar, S. A. Chambers, F. Wilhelm and A. Rogalev
Phys. Rev. B 82, 041202(R) (2010) DOI: 10.1103/PhysRevB.82.041202

20 - Influence of the developing magnetic order on the transport properties of epitaxial Zn_1-xCo_xO films
S. Ye, V. Ney, T. Kammermeier, K. Ollefs, S. Zhou, H. Schmidt, A. Ney
J. Phys.: Conference Series 200, 052034 (2010) DOI: 10.1088/1742-6596/200/5/052034

19 - Anisotropic paramagnetism of Co-doped ZnO epitaxial films
A. Ney, T. Kammermeier, K. Ollefs, S. Ye, V. Ney, T. C. Kaspar, S. A. Chambers, F. Wilhelm and A. Rogalev
Phys. Rev. B 81, 054420 (2010) DOI: 10.1103/PhysRevB.81.054420

18 - Advanced spectroscopic synchrotron techniques to unravel the intrinsic properties of dilute magnetic oxides: the case of Co:ZnO
A. Ney, M. Opel, T. C. Kaspar, V. Ney, S. Ye, K. Ollefs, T. Kammermeier, S. Bauer, K.-W. Nielsen, S. T. B. Goennenwein, M. H. Engelhard, S. Zhou, K. Potzger, J. Simon, W. Mader, S. M. Heald, J. C. Cezar, F. Wilhelm, A. Rogalev, R. Gross and S. A. Chambers
New J. Phys. 12, 013020 (2010) DOI: 10.1088/1367-2630/12/1/013020

17 - Tuning the magnetic properties of Zn_1-xCo_xO films
V. Ney, S. Ye, T. Kammermeier, K. Ollefs, A. Ney, T.C. Kaspar, S.A. Chambers, F. Wilhelm and A. Rogalev
J. Magn. Magn. Mater. 322, 1232 (2010) DOI: 10.1016/j.jmmm.2009.04.024

16 - Gd-doped GaN studied with element specifity: very small polarization of Ga, paramagnetism of Gd and the formation of magnetic clusters
A. Ney, T. Kammermeier, K. Ollefs, V. Ney, S. Ye, S. Dhar, K. H. Ploog, M. R�ver, J. Malindretos, A. Rizzi, F. Wilhelm, A. Rogalev
J. Magn. Magn. Mater. 322, 1162 (2010) DOI: 10.1016/j.jmmm.2009.06.033

15 - Observation of the Onset of Magnetic Clustering in Superparamagnetic Zn_1-xCo_xO Films
S. Ye, V. Ney , T. Kammermeier, K. Ollefs, A. Ney, F. Wilhelm and A. Rogalev
J. Supercond. Nov. Magn. 23, 91 (2010) DOI: 10.1007/s10948-009-0566-6
2009

14 - Absence of ferromagnetic-transport signatures in epitaxial paramagnetic and superparamagnetic Zn_0.95Co_0.05O films
S. Ye, V. Ney, T. Kammermeier, K. Ollefs, S. Zhou, H. Schmidt, F. Wilhelm, A. Rogalev, and A. Ney
Phys. Rev. B 80, 245321 (2009) DOI: 10.1103/PhysRevB.80.245321

13 - Nonferromagnetic nanocrystalline ZnO:Co thin films doped with Zn interstitials
Christoph Knies, Matthias T. Elm, Peter J. Klar, Jan Stehr, Detlev M. Hofmann, Nikolai Romanov, Tom Kammermeier, and Andreas Ney
J Appl. Phys. 105, 073918 (2009) DOI: 10.1063/1.3095469

12 - Element specific measurements of the structural properties and magnetism of Co_xZn_1-xO
T. Kammermeier, V. Ney, S. Ye, K. Ollefs, T. C. Kaspar, S. A. Chambers, F.Wilhelm, A. Rogalev, and A. Ney
J. Magn. Magn. Mater. 321, 699 (2009) DOI: 10.1016/j.jmmm.2008.11.028
2008

11 - Structural, Magnetic and Optical Properties of Co- and Gd-implanted ZnO(0001) substrates
V. Ney, S. Ye, T. Kammermeier, A. Ney, H. Zhou, J. Fallert, H. Kalt, F.-Y. Lo, A. Melnikov, and A. D. Wieck
J. Appl. Phys. 104, 083904 (2008) DOI: 10.1063/1.3000452

10 - Metastable magnetism and memory effects in dilute magnetic semiconductors
A. Ney, R. Rajaram, T. Kammermeier, V. Ney, S. Dhar, K. H. Ploog and S. S. P. Parkin
J. Phys.: Condens. Matter 20, 285222 (2008) DOI: 10.1088/0953-8984/20/28/285222

9 - Limitations of measuring small magnetic signals of samples deposited on a diamagnetic substrate
A. Ney, T. Kammermeier, V. Ney, K. Ollefs, and S. Ye
J. Magn. Magn. Mater. 320, 3341 (2008) DOI: 10.1016/j.jmmm.2008.07.008

8 - Element specific magnetic properties of Gd:GaN: very small polarization of Ga and paramagnetism of Gd
A. Ney, T. Kammermeier, V. Ney, S. Ye, K. Ollefs, E. Manuel, S. Dhar, K. H. Ploog, E. Arenholz, F. Wilhelm, and A. Rogalev
Phys. Rev. B 77, 233308 (2008) DOI: 10.1103/PhysRevB.77.233308

7 - Paramagnetic and ferromagnetic resonance studies on dilute magnetic semiconductors based on GaN
T. Kammermeier, S. Dhar , V. Ney, E. Manuel, A. Ney, K. H. Ploog, F.-Y. Lo, A. Melnikov, A. D. Wieck
phys. stat. sol. (a) 205 (8), 1872 (2008) DOI: 10.1002/pssa.200824023

6 - Absence of intrinsic ferromagnetic interactions of isolated and paired Co dopant atoms in Zn_1-xCo_xO with high structural perfection
A. Ney, K. Ollefs, S. Ye, T. Kammermeier, V. Ney, T. C. Kaspar, S. A. Chambers, F. Wilhelm, and A. Rogalev
Phys. Rev. Lett. 100, 157201 (2008) DOI: 10.1103/PhysRevLett.100.157201
2007

5 - Experimental investigation of the metastable magnetic properties of Cr-doped InN
A. Ney, R. Rajaram, S.S.P. Parkin, T. Kammermeier, S. Dhar
Phys. Rev. B 76, 035205 (2007) DOI: 10.1103/PhysRevB.76.035205

4 - Magnetic and structural properties of Gd-implanted zinc-blende GaN
F.-Y. Lo, A. Melnikov, D. Reuter, A. D. Wieck, V. Ney, T. Kammermeier, A. Ney, J. Sch�rmann, S. Potthast, D. J. As, and K. Lischka
Appl. Phys. Lett. 90, 262505 (2007) DOI: 10.1063/1.2753113

3 - Element specific investigations of the structural and magnetic properties of Gd:GaN
A. Ney, T. Kammermeier, E. Manuel, V. Ney, S. Dhar, K.H. Ploog, F. Wilhelm, and A. Rogalev
Appl. Phys. Lett. 90, 252515 (2007) DOI: 10.1063/1.2750542
2006

2 - Magnetic properties of epitaxial CrN films
A. Ney, R. Rajaram, S. S. P. Parkin, T. Kammermeier, S. Dhar
Appl. Phys. Lett. 89, 112504 (2006) DOI: 10.1063/1.2352795

1 - Ferromagnetism and colossal magnetic moment in Gd-focused ion-beam-implanted GaN
S. Dhar, T. Kammermeier, A. Ney, L. Perez, K. H. Ploog, A. Melnikov, and A. D. Wieck
Appl. Phys. Lett. 89, 062503 (2006) DOI: 10.1063/1.2267900

Farle Research Group

Structure and Magnetism on the Nanoscale

Staff