An extensive comparison of anisotropies in MBE grown (Ga,Mn)As material
C. Gould, S. Mark, K. Pappert, G. Dengel, J. Wenisch, R.P. Campion,, A.W. Rushforth, D. Chiba, Z. Li, X. Liu, W. Van Roy, H. Ohno, J.K. Furdyna,, B. Gallagher, K. Brunner, G. Schmidt, L.W. Molenkamp
TL;DR
This study provides a comprehensive magnetotransport analysis of magnetic anisotropies in (Ga,Mn)As layers, revealing common uniaxial anisotropy contributions and their layer-specific amplitudes across samples.
Contribution
It introduces anisotropy fingerprinting as a method to identify and quantify higher order anisotropy terms in (Ga,Mn)As layers, highlighting their prevalence and variability.
Findings
Presence of both [100] and [110] uniaxial anisotropies in all samples
Amplitude of uniaxial anisotropies varies with individual layers
Higher order anisotropy terms are common in (Ga,Mn)As layers
Abstract
This paper reports on a detailed magnetotransport investigation of the magnetic anisotropies of (Ga,Mn)As layers produced by various sources worldwide. Using anisotropy fingerprints to identify contributions of the various higher order anisotropy terms, we show that the presence of both a [100] and a [110] uniaxial anisotropy in addition to the primary ([100] + [010]) anisotropy is common to all medium doped (Ga,Mn)As layers typically used in transport measurement, with the amplitude of these uniaxial terms being characteristic of the individual layers.
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