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Determination of current-induced spin-orbit effective magnetic field in GaMnAs ferromagnetic semiconductor

Authors
Lee, SangyeopChoi, SeonghoonBac, Seul-KiLee, Kyung JaeChang, JihoonChoi, SuhoChongthanaphisut, PhunviraLee, SanghoonLiu, XinyuDobrowolska, M.Furdyna, Jacek K.
Issue Date
18-12월-2017
Publisher
AMER INST PHYSICS
Citation
APPLIED PHYSICS LETTERS, v.111, no.25
Indexed
SCIE
SCOPUS
Journal Title
APPLIED PHYSICS LETTERS
Volume
111
Number
25
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/81156
DOI
10.1063/1.5012532
ISSN
0003-6951
Abstract
We report a method for accurate determination of the strength of the current-induced spin-orbit (SO) field in ferromagnetic GaMnAs films. The SO-field manifests itself in the form of a hysteresis between planar Hall resistances (PHR) measured with positive and negative currents as an applied magnetic field is rotated in the sample plane at constant field strength. The width of the hysteresis, which is related to the strength of the SO-field, is observed to change significantly for different values of the rotating external field strength. Since the SO field occurring at a given current is an intrinsic property of the crystal, such a field dependence of the hysteresis indicates that the width of the hysteresis measured with a single field strength is insufficient for determining the SO field. However, using a model based on magnetic free energy that includes the effects of magnetic anisotropy and the SO-field as developed in the present paper, we show that the SO field for a given current density can be accurately established by fitting to the experimentally observed dependence of transition angles of PHR measured with different applied field strengths. Using the known dependence of magnetic anisotropy of GaMnAs on temperature, we also show that this method applies reliably as the temperature varies. Published by AIP Publishing.
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