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A. Shalimov,
K. Potzger, D. Geiger,
H. Lichte,
G. Talut,
A. Misiuk,
H. Reuther,
F. Stromberg,
Shengqiang Zhou,
C. Baehtz,
J. Fassbender
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ABSTRACT: Iron nanoparticles embedded in MgO crystals were synthesized by Fe <sup>+</sup> ion implantation at an energy of 100 keV and varying fluences from 3×10<sup>16</sup> to 3×10<sup>17</sup> cm <sup>-2</sup> . Investigations of structural and magnetic properties of Fe nanoparticles have been performed using magnetometry, x-ray diffraction, transmission electron microscopy, and Mössbauer spectroscopy, as well as by theoretical Preisach modeling of bistable magnetic systems. It has been found that α - and γ -Fe nanoparticles are formed for all fluences. The content of the α -Fe phase increases at higher fluences and after annealing. The influence of postimplantation annealing at 800 ° C in vacuum and under enhanced hydrostatic pressure on the formation of nanoparticles has been analyzed.
Journal of Applied Physics 04/2009; · 2.17 Impact Factor
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Zhou Shengqiang,
K. Potzger,
Zhang Gufei,
A. Muecklich,
F. Eichhorn,
N. Schell,
R. Groetzschel,
B. Schmidt,
W. Skorupa,
M. Helm,
J. Fassbender, D. Geiger,
Institute of Structure Physics, Dresden University, Zellescher Weg Dresden
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ABSTRACT: Structural and magnetic properties in Mn-implanted, p-type Si were investigated. High resolution structural analysis techniques such as synchrotron x-ray diffraction revealed the formation of MnSi{sub 1.7} nanoparticles already in the as-implanted samples. Depending on the Mn fluence, the size increases from 5 nm to 20 nm upon rapid thermal annealing. No significant evidence is found for Mn substituting Si sites either in the as-implanted or annealed samples. The observed ferromagnetism yields a saturation moment of 0.21{mu}{sub B} per implanted Mn at 10 K, which could be assigned to MnSi{sub 1.7} nanoparticles as revealed by a temperature-dependent magnetization measurement.
Physical Review. B, Condensed Matter and Materials Physics. 02/2007; 75(8).
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Shengqiang Zhou,
K. Potzger,
Gufei Zhang,
A. Mücklich,
F. Eichhorn,
N. Schell,
R. Grötzschel,
B. Schmidt,
W. Skorupa,
M. Helm,
J. Fassbender, D. Geiger
[show abstract]
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ABSTRACT: Structural and magnetic properties in Mn-implanted, p-type Si were investigated. High resolution structural analysis techniques such as synchrotron x-ray diffraction revealed the formation of MnSi1.7 nanoparticles already in the as-implanted samples. Depending on the Mn fluence, the size increases from 5 nm to 20 nm upon rapid thermal annealing. No significant evidence is found for Mn substituting Si sites either in the as-implanted or annealed samples. The observed ferromagnetism yields a saturation moment of 0.21μB per implanted Mn at 10 K, which could be assigned to MnSi1.7 nanoparticles as revealed by a temperature-dependent magnetization measurement.
Phys. Rev. B. 01/2007; 75(8).
