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Abstract: Using the angular dependence of the planar Hall effect in GaMnAsferromagnetic films, we were able to determine the distribution of magneticdomain pinning fields in this material. Interestingly, there is a majordifference between the pinning field distribution in as-grown and in annealedfilms, the former showing a strikingly narrower distribution than the latter.This conspicuous difference can be attributed to the degree of non-uniformityof magnetic anisotropy in both types of films. This finding provides a betterunderstanding of the magnetic domain landscape in GaMnAs that has been thesubject of intense debate.



Author: Jungtaek Kim, D. Y. Shin, Sanghoon Lee, X. Liu, J. K. Furdyna

Source: https://arxiv.org/







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