Magnetic properties of Ge1-xMnxTe ferromagnetic semiconductors doped with gadoliniumстатья
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Дата последнего поиска статьи во внешних источниках: 19 июля 2013 г.
Авторы:
Zvereva E.A. ,
Skipetrov E.P. ,
Savelieva O.A. ,
Pichugin N.A. ,
Primenko A.E. ,
Akishina V.P. ,
Slyn’ko E.I. ,
Slyn’ko V.E.
Журнал:
Journal of Physics: Conference Series
Том:
200
Номер:
6
Год издания:
2010
Издательство:
IOP Publishing
Местоположение издательства:
[Bristol, UK], England
Первая страница:
062040
DOI:
10.1088/1742-6596/200/6/062040
Аннотация:
We report on magnetic measurements and X-band electron paramagnetic resonance for Ge1-x-yMnxGdyTe (x=0.15-0.40, y=0, 0.02) single crystals. Ferromagnetic behavior was observed with the Curie temperature TC=70-90 K depending on the alloy composition. Effective magnetic moment p eff per Mn ion estimated from the Curie constant increases with increasing x from 2.8 up to 4.3 μ B, while saturation magnetization per magnetic ion at 4.2 K gives 1.7-3.4 μ B. EPR spectra at low temperatures are described by Dysonian type line, which splits into two lines at T ≈ 150 K. At temperature lower this value we observe distinct anomalies on temperature dependencies of the linewidths and g-factors. In paramagnetic region anomalous broadening of the linewidth with decreasing the temperature is revealed, while the g-factor is practically independent both on temperature and alloy composition. © 2010 IOP Publishing Ltd.
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