Experimental determination of next-nearest-neighbor interlayer exchange coupling in ferromagnetic GaMnAs/GaAs: Be multilayers

Hakjoon Lee, Seul Ki Bac, Sangyeop Lee, Seonghoon Choi, Taehee Yoo, Sang Hoon Lee, Xinyu Liu, Jacek K. Furdyna

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We report direct experimental determination of next-nearest-neighbor (NNN) interlayer exchange coupling (IEC) in antiferromagnetically coupled GaMnAs/GaAs:Be multilayers. Magnetoresistance in such multilayers shows step-like transitions as a function of applied magnetic field that corresponds to abrupt changes of spin configuration. By adjusting the field range, one obtains minor hysteresis loops that allow one to determine spin configurations occurring in the multilayer, which in turn can be used to obtain the ratio of NNN IEC to NN IEC. By using this method on a series of GaMnAs/GaAs:Be with different numbers of GaMnAs layers, we obtain this ratio to be 0.23, in good agreement with theoretical predictions.

Original languageEnglish
Article number192403
JournalApplied Physics Letters
Issue number19
Publication statusPublished - 2015 Nov 9


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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