Magnetic clusters in semiconductors

Collaboration:

Dr. A. Ney, Universität Duisburg-Essen, now at University of Linz

Dr. C. Sürges, KIT

Abstract

According to the necessity of ferromagnetic semiconductor materials for spintronics, the project is focused on the investigation of magnetic clusters embedded in semiconductors. The new aspects of the project are given by the investigation of the effect of magnetic nanoparticles on the charge carriers and of magnetic  phenomena induced by implantation defects. The analysis is focused on high-resolution techniques using photon beams. These techniques will allow the clear identification of secondary phases as well as the element specific investigation of the electronic structure.


Figures

  • The presence of a ferromagnetic diluted magnetic semiconductor (DMS) based on ZnO can be confused with non-detectable metallic nanoparticles.

SQUID

Röntgendiffraktion

ZnO SQUID

ZnO XRD1

  • The zero-field cooled / field cooled magnetization vs. temperature dependence clearly shows freezing/defreezing effects of magnetic moments. The latter can be explained by the presence of superparamagnetic nanoparticles
  • Direct evidence for the existence of crystalline α-Fe nanoparticles is given by XRD. Note that only the high sensitive synchrotron XRD can detect these tiny particles while common lab XRD fails.
  • Non - systematic dependence of the magnetisation on the particle size of MnSi nanoparticles formed via Mn implantation into Si has been observed.

MnSi_abc The nanoparticles MnSi1.7 show increase in size with increasing Mn fluence ((a) 1×1015 cm-2, (b) 1×1016 cm-2 and (c) 5×1016 cm-2. ). Only for the middle fluence, however, superparamagnetism can be observed.

Publications

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,

N. J. Phys. 12, 013020 (2010).

Memory effect of Mn5Ge3 nanomagnets embedded inside a Mn-diluted Ge matrix

Shengqiang Zhou, A. Shalimov, K. Potzger, N. M. Jeutter, C. Baehtz, M. Helm, J. Fassbender, and H. Schmidt,

Appl. Phys. Lett. 95, 192505 (2009).

MnSi1.7 nanoparticles embedded in Si: Superparamagnetism with collective behavior

Shengqiang Zhou, A. Shalimov, K. Potzger, M. Helm, J. Fassbender, and H. Schmidt,

 

Phys. Rev. B 80, 174423 (2009).

Spinel ferrite nanocrystals embedded inside ZnO: Magnetic, electronic, and magnetotransport properties

S. Q. Zhou, K. Potzger, Q. Y. Xu, K. Kuepper, G. Talut, D. Marko, A. Muecklich, M. Helm, J. Fassbender, E. Arenholz, and H. Schmidt

Phys. Rev. B 80, 094409 (2009).

Spin-dependent transport in nanocomposite C:Co films

S. Q. Zhou, M. Berndt, D. Buerger, V. Heera, K. Potzger, G. Abrasonis, G. Radnoczi, G. J. Kovacs, A. Kolitsch, M. Helm, J. Fassbender, W. Moeller, and H. Schmidt

Act. Mater. 57, 4758 (2009).

Magnetism of carbon doped Mn5Si3 and Mn5Ge3 films

C. Suergers, K. Potzger, and G. Fischer

J. Chem. Sci. 121, 173 (2009).

Amorphous clusters in Co implanted ZnO induced by boron preimplantation

K. Potzger, A. Shalimov, S. Q. Zhou, H. Schmidt, A. Muecklich, M. Helm, J. Fassbender, M.  Liberati, and E. Arenholz

J. Appl. Phys. 105, 123917 (2009).

Inverse spinel ZnFe2O4 nanoparticles synthesized by ion implantation and post-annealing: An investigation using X-ray spectroscopy and magneto-transport

S. Zhou, K. Potzger, D. Buerger, K. Kuepper, M. Helm, J. Fassbender, and H. Schmidt

Nucl. Instrum. Meth. B 267, 1620 (2009).

Ferromagnetic transition metal implanted ZnO: A diluted magnetic semiconductor?

S. Q. Zhou, K. Potzger, Q. Y. Xu, G. Talut, M. Lorenz, W. Skorupa, M. Helm, J. Fassbender, M. Grundmann, and H. Schmidt

Vacuum 83, S13 (2009).

Non-DMS related ferromagnetism in transition metal doped zinc oxide

K. Potzger and S. Q. Zhou

Phys. Stat. Sol. B 246, 1147 (2009).

Paramagnetism in Co-doped ZnO films

Q. Y. Xu, S. Zhou, D. Marko, K. Potzger, J. Fassbender, M. Vinnichenko, M. Helm, H. Hochmuth, M. Lorenz, M. Grundmann, and H. Schmidt

J. Phys. D Appl. Phys. 42, 085001 (2009).

Ferromagnetic structurally disordered ZnO implanted with Co ions

K. Potzger, S. Q. Zhou, Q. Y. Xu, A. Shalimov, R. Groetzschel, H. Schmidt, A. Muecklich, M. Helm, and J. Fassbender

Appl. Phys. Lett. 93, 232504 (2008).

Room temperature ferromagnetism in carbon-implanted ZnO

S. Q. Zhou, Q. Y. Xu, K. Potzger, G. Talut, R. Groetzschel, J. Fassbender, M. Vinnichenko, J. Grenzer, M. Helm, H. Hochmuth, M. Lorenz, M. Grundmann, and H. Schmidt

Appl. Phys. Lett. 93,  232507 (2008).

High cluster formation tendency in Co implanted ZnO

K. Potzger, K. Kuepper, Q. Y. Xu, S. Q. Zhou, H.Schmidt, M.Helm, and J. Fassbender

J. Appl. Phys. 104, 023510 (2008).

Magnetic order by C-ion implantation into Mn5Si3 and Mn5Ge3 and its lateral modification

C. Suergers, K. Potzger, T. Strache, W. Moeller, G. Fischer, N. Joshi, and H. von Loehneysen

Appl. Phys. Lett. 93, 062503 (2008).

X-ray Spectroscopic and Magnetic Investigation of C:Ni Nanocomposite Films Grown by Ion Beam Cosputtering

G. Abrasonis, A. C. Scheinost, S. Zhou, R. Torres, R. Gago, I. Jiménez, K. Kuepper, K. Potzger, M. Krause, A. Kolitsch, W. Moller, S. Bartkowski, M. Neumann, and R. R. Gareev

J. Phys. Chem. C 112, 12628 (2008).

Crystallographically oriented Fe nanocrystals formed in Fe-implanted TiO2

Shengqiang Zhou, G. Talut, K. Potzger, A. Shalimov, J. Grenzer, W. Skorupa, M. Helm, J. Fassbender, E. Cizmar, S. A. Zvyagin, and J. Wosnitza

J. Appl. Phys. 103, 083907 (2008).

Using x-ray diffraction to identify precipitates in transition metal doped semiconductors

Shengqiang Zhou, K. Potzger, G. Talut, J. von Borany, W. Skorupa, M. Helm, and J. Fassbender,

J. Appl. Phys. 103, 07D530 (2008).

Structural and magnetic properties of Tb implanted ZnO single crystals

Shengqiang Zhou, K. Potzger, A. Mücklich, F. Eichhorn, M. Helm, W. Skorupa, J. Fassbender

Nucl. Instrum. Meth. B 266, 589 (2008).

Fe implanted ZnO: Magnetic precipitates versus dilution

S.Q. Zhou, K. Potzger, G. Talut, H. Reuther, J. von Borany, W. Skorupa, M. Helm, J. Fassbender, N. Volbers, M. Lorenz, T. Hermannsdörfer

J. App. Phys. 103, 023902 (2008).

Crystallographically oriented Co and Ni nanocrystals inside ZnO formed by ion implantation and post-annealing

S. Q. Zhou, K. Potzger, J. von Borany, R. Grötzschel, W. Skorupa, M. Helm, J. Fassbender

Phys. Rev. B 77, 035209 (2008) and Virt. J. Nanoscale Sci. and Technol., Feb. 2008.

Suppression of secondary phase formation in Fe implanted ZnO single crystals

K. Potzger, Shengqiang Zhou, H. Reuther, K. Kuepper, G. Talut, M. Helm, J. Fassbender, and J. D. Denlinger,

Appl. Phys. Lett. 91, 062107 (2007)

Absence of ferromagnetism in V-implanted ZnO single crystals

Shengqiang Zhou, K. Potzger, H. Reuther, K. Kuepper, W. Skorupa, M. Helm, J. Fassbender

J. Appl. Phys.101, 033906 (2007)

Crystallographically oriented magnetic ZnFe2O4 nanoparticles synthesized by Fe implantation into ZnO

Shengqiang Zhou, K. Potzger, H. Reuther, G. Talut, F. Eichhorn, J. von Borany, W. Skorupa, M. Helm, J. Fassbender

J. Phys. D: Appl. Phys, 40, 964 (2007)

The effect of flash lamp annealing on Fe implanted ZnO single crystals

K. Potzger, W. Anwand , H. Reuther , Shengqiang Zhou , G. Talut , G. Brauer , W. Skorupa , J. Fassbender

J. Appl. Phys., 101, 033906 (2007).

Crystalline Ni nanoparticles as the origin of ferromagnetism in Ni implanted ZnO crystals

Shengqiang Zhou, K. Potzger, Gufei Zhang, F. Eichhorn, W. Skorupa, M. Helm, and J. Fassbender

J. Appl. Phys. 100, 114304 (2006).

Ferromagnetic Gd-implanted ZnO single crystals

K. Potzger, Shengqiang Zhou, F. Eichhorn, M. Helm, W. Skorupa, A. Mücklich, J. Fassbender, T. Herrmannsdörfer, and A. Bianchi

J. Appl. Phys. 99, 063906 (2006).

Fe implanted ferromagnetic ZnO

K. Potzger, Shengqiang Zhou, H. Reuther, A. Mücklich, F. Eichhorn, N. Schell, W. Skorupa, M. Helm, and J. Fassbender, T. Herrmannsdörfer and T. P. Papageorgiou

Appl. Phys. Lett. 88, 052508 (2006).

Structural and magnetic properties of Mn-implanted Si

Shengqiang Zhou, K. Potzger, Gufei Zhang, A. Muecklich, F. Eichhorn, N. Schell, R. Groetzschel, B. Schmidt, W. Skorupa, M. Helm, J. Fassbender

Phys. Rev. B 75, 085203 (2007).


Content from Sidebar

Interface magnetism(1)

Contact

Dr. Kay Potzger(2)
Project group leader
(3)
Tel.: 0351-260-3244, 2411
E-Mail: k.potzger@hzdr.de(4)


Group members

Dr. Rantej Bali

Joao Cabaco


Former group members

Shadab Anwar

Serhii Sorokin

Hamza Cansever

Alexander Schmeink

Jonathan Ehrler
Thu Trang Trinh

Dr. Maciej Oskar Liedke
Dr. Anna Semisalova
Naren Srinivasan

Alireza Heidarian
Julius Beck
Alevtina Smekhova

Oguz Yildirim
Steffen Cornelius
Camilo Otalora

Daniel Blaschke
Maik Butterling
Nico Spahn
Falk Meutzner
Armin Haase

Tim Andrae
Kerstin Bernert
Nikolas Blum
Marcel Höwler

Tina Nestler
Julia Osten
Artem Shalimov
Georg Talut
Gufei Zhang
Shengqiang Zhou


Meetings

-FWIN-G -meeting: thursdays usually at 2 pm


Downloads

PREM(5) (Preisach simulations)

MBE sample sheet(6)

Further MBE instructions: O:\Labs\MBE_712_108_108a


Lectures

- Magnetic materials(7), TUBA Freiberg, summer semester


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