Mixed magnetic phases in (Ga,Mn)As epilayers
K. Hamaya, T. Taniyama, Y. Kitamoto, and Y. Yamazaki
TL;DR
This study reveals two distinct ferromagnetic-paramagnetic transitions in (Ga,Mn)As epilayers, attributed to cluster phases and the matrix, with a temperature-dependent change in magnetic easy axis explained by anisotropy contributions.
Contribution
It identifies and characterizes two separate magnetic phases and their transitions in (Ga,Mn)As epilayers, highlighting the role of anisotropy in magnetic behavior.
Findings
Two ferromagnetic-paramagnetic transitions detected
Cluster phases exhibit [110] uniaxial anisotropy
Matrix shows <100> cubic anisotropy and a change in easy axis with temperature
Abstract
Two different ferromagnetic-paramagnetic transitions are detected in (Ga,Mn)As/GaAs(001) epilayers from ac susceptibility measurements: transition at a higher temperature results from (Ga,Mn)As cluster phases with [110] uniaxial anisotropy and that at a lower temperature is associated with a ferromagnetic (Ga,Mn)As matrix with <100> cubic anisotropy. A change in the magnetic easy axis from [100] to [110] with increasing temperature can be explained by the reduced contribution of <100> cubic anisotropy to the magnetic properties above the transition temperature of the (Ga,Mn)As matrix.
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