NDLI: Anisotropic AC Magnetic Susceptibility in (Ga,Mn)As Films

Content Provider	IEEE Xplore Digital Library
Author	Xiang Li Sining Dong Taehee Yoo Xinyu Liu Sanghoon Lee Furdyna, J.K. Dobrowolska, M.
Copyright Year	1965
Abstract	We report a systematic investigation of ac magnetic susceptibility in (Ga,Mn)As films as a function of temperature and magnetic field, carried out in parallel with dc magnetization measurements. The temperature dependence of ac susceptibility χ_ac shows anisotropic behavior: 1) a single peak in χ_ac is observed close to T for the [11̅0] orientation of the driving ac field; 2) a single peak is also seen close to 22 K for the field along [110]; and 3) peaks at both these temperatures are observed for the field applied along [100]. A detailed analysis of the ac and dc data unambiguously indicates that the peak near T is related to the paramagnetic-to-ferromagnetic phase transition, with the ferromagnetic domains nucleating with their easy axes aligned with the [11̅0] direction, providing a clear picture of uniaxial domain behavior near T . The peak near 22 K, on the other hand, is related to the onset of biaxial domain structure in (Ga,Mn)As induced by the competition between uniaxial and cubic anisotropy. More specifically, the ac susceptibility peak near T_C involves 180° magnetization flips along the [11̅0] easy axis of the domains, while the peak near 22 K originates from magnetization wobbling between two biaxial easy axes separated by a small angle.
Sponsorship	IEEE Magnetics Society
Starting Page	1
Ending Page	4
Page Count	4
File Size	1450022
File Format	PDF
ISSN	00189464
Volume Number	51
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Temperature measurement Magnetization Magnetic susceptibility Magnetic hysteresis Magnetic field measurement Magnetic anisotropy Films magnetic domains and magnetic susceptibility Ferromagnetic semiconductors magnetic anisotropy magnetic susceptibility magnetic domains
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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