Magnetization process of the n -type ferromagnetic semiconductor (In,Fe)As:Be studied by x-ray magnetic circular dichroism

In order to investigate the mechanism of ferromagnetic ordering in the new n-type magnetic semiconductor (In,Fe)As codoped with Be, we have performed x-ray absorption spectroscopy and x-ray magnetic circular dichroism (XMCD) studies of ferromagnetic and paramagnetic samples. The spectral line shapes...

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Bibliographic Details
Published in:Physical review. B 2016-01, Vol.93 (3), Article 035203
Main Authors: Sakamoto, S., Anh, L. D., Hai, P. N., Shibata, G., Takeda, Y., Kobayashi, M., Takahashi, Y., Koide, T., Tanaka, M., Fujimori, A.
Format: Article
Language:English
Subjects:
Circularity
Condensed matter
Dichroism
Ferromagnetism
N-type semiconductors
Nanostructure
Semiconductors
X-rays
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Summary:In order to investigate the mechanism of ferromagnetic ordering in the new n-type magnetic semiconductor (In,Fe)As codoped with Be, we have performed x-ray absorption spectroscopy and x-ray magnetic circular dichroism (XMCD) studies of ferromagnetic and paramagnetic samples. The spectral line shapes suggest that the ferromagnetism is intrinsic, originating from Fe atoms incorporated into the zinc-blende-type InAs lattice. The magnetization curves of Fe measured by XMCD were well reproduced by the superposition of a Langevin function representing superparamagnetic (SPM) behavior of nanoscale ferromagnetic domains and a T-linear function representing Curie-Weiss paramagnetism even much above the Curie temperatures. The data at 20 K showed a deviation from the Langevin behavior, suggesting a gradual establishment of macroscopic ferromagnetism on lowering temperature. The existence of nanoscale ferromagnetic domains indicated by the SPM behavior suggests spatial fluctuations of Fe concentration on the nanoscale.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.93.035203