Magnetic Properties of Single Crystalline Ge } Mn Nanowires

A detailed study of the magnetic properties of single crystalline Ge 1-x Mn x nanowires is presented. Free-standing nanowires with an averaged diameter of 30-180 nm and several microns in length were grown by a supercritical fluid-liquid-solid method. The absence of various Ge-Mn crystallographic pr...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2009-10, Vol.45 (10), p.4085-4088
Main Authors: Kazakova, O., van der Meulen, M.I., Petkov, N., Holmes, J.D.
Format: Article
Language:English
Subjects:
Area measurement
Atomic measurements
Crystallization
Crystallography
Ferromagnetic materials
germanium compounds
Magnetic moments
Magnetic properties
magnetic semiconductors
Magnetism
Magnetization
Nanowires
Temperature
Wire
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Summary:A detailed study of the magnetic properties of single crystalline Ge 1-x Mn x nanowires is presented. Free-standing nanowires with an averaged diameter of 30-180 nm and several microns in length were grown by a supercritical fluid-liquid-solid method. The absence of various Ge-Mn crystallographic precipitates and oxide shells around the wire was confirmed by a number of structural techniques. Magnetization measurements demonstrate a clear ferromagnetic ordering at room temperature. However, the net magnetic moment is relatively low, with the maximum measured saturation moment per Mn atom in the order of 0.7 mu B at T = 300 K. The weak room-temperature ferromagnetism most likely originates from areas rich in diluted Mn atoms. The magnetic properties of Ge 1-x Mn x nanowires can be qualitatively explained by propagation and the merge of bound magnetic polarons, which seed initially in areas with the largest local concentration of dispersed Mn ions.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2009.2023073