Spin and orbital magnetic moments of Fe in the n -type ferromagnetic semiconductor (In,Fe)As

The electronic and magnetic properties of Fe atoms in the ferromagnetic semiconductor (In,Fe)As codoped with Be have been studied by x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) at the Fe L2,3 edge. The XAS and XMCD spectra showed simple spectral line shapes simil...

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Published inApplied physics letters Vol. 105; no. 3
Main Authors Kobayashi, M., Anh, L. D., Hai, P. N., Takeda, Y., Sakamoto, S., Kadono, T., Okane, T., Saitoh, Y., Yamagami, H., Harada, Y., Oshima, M., Tanaka, M., Fujimori, A.
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 21.07.2014
Subjects
ABSORPTION SPECTROSCOPY
Applied physics
ARSENIC COMPOUNDS
ATOMS
Beryllium
BERYLLIUM ADDITIONS
Charge transfer
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Dichroism
ELECTRICAL PROPERTIES
FERROMAGNETIC MATERIALS
Ferromagnetism
INDIUM ARSENIDES
INDIUM COMPOUNDS
IRON
IRON COMPOUNDS
Line spectra
MAGNETIC CIRCULAR DICHROISM
Magnetic domains
MAGNETIC FIELDS
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MAGNETIC SEMICONDUCTORS
Magnetism
N-type semiconductors
SPECTRA
Spectrum analysis
SPIN
Sum rules
SUPERPARAMAGNETISM
Valence band
X RADIATION
X ray absorption
X ray spectra
X-RAY SPECTROSCOPY
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ISSN0003-6951
1077-3118
DOI10.1063/1.4890733

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Summary:The electronic and magnetic properties of Fe atoms in the ferromagnetic semiconductor (In,Fe)As codoped with Be have been studied by x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) at the Fe L2,3 edge. The XAS and XMCD spectra showed simple spectral line shapes similar to Fe metal, but the ratio of the orbital and spin magnetic moments (Morb/Mspin) estimated using the XMCD sum rules was significantly larger than that of Fe metal, indicating a significant orbital moment of Fe 3d electrons in (In,Fe)As:Be. The positive value of Morb/Mspin implies that the Fe 3d shell is more than half-filled, which arises from the hybridization of the Fe3+ (d5) state with the charge-transfer d6L¯ states, where L¯ is a ligand hole in the host valence band. The XMCD intensity as a function of magnetic field indicated hysteretic behavior of the superparamagnetic-like component due to discrete ferromagnetic domains.
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ISSN:0003-6951
1077-3118
DOI:10.1063/1.4890733