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

Journal Article · Mon Jul 21 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4890733· OSTI ID:22311147

Oshima, M. ^[1]; Anh, L. D.; Hai, P. N.; Tanaka, M. ^[2]; Takeda, Y.; Okane, T.; Saitoh, Y.; Yamagami, H. ^[3]; Sakamoto, S.; Kadono, T.; Fujimori, A. ^[4]; Harada, Y. ^[5]

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1. Department of Applied Chemistry, School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan)
2. Department of Electrical Engineering and Information Systems, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan)
3. Synchrotron Radiation Research Unit, Japan Atomic Energy Agency, Sayo-gun, Hyogo 679-5148 (Japan)
4. Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 (Japan)
5. Synchrotron Radiation Research Organization, University of Tokyo, 1-490-2 Kouto, Sayo-cho, Tatsuno, Hyogo 679-5165 (Japan)

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 L{sub 2,3} 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 (M{sub orb}/M{sub spin}) 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 M{sub orb}/M{sub spin} implies that the Fe 3d shell is more than half-filled, which arises from the hybridization of the Fe{sup 3+} (d{sup 5}) state with the charge-transfer d{sup 6}L{sub ¯} states, where L{sub ¯} 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.

• OSTI ID: 22311147
• Journal Information: Applied Physics Letters, Vol. 105, Issue 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTROSCOPY
ARSENIC COMPOUNDS
ATOMS
BERYLLIUM ADDITIONS
ELECTRICAL PROPERTIES
FERROMAGNETIC MATERIALS
INDIUM ARSENIDES
INDIUM COMPOUNDS
IRON
IRON COMPOUNDS
MAGNETIC CIRCULAR DICHROISM
MAGNETIC FIELDS
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MAGNETIC SEMICONDUCTORS
SPECTRA
SPIN
SUPERPARAMAGNETISM
X RADIATION
X-RAY SPECTROSCOPY