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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Abstract

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
Volume107
Issue number19
DOIs
Publication statusPublished - 2015 Nov 9

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interlayers
configurations
adjusting
hysteresis
predictions
magnetic fields

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  • Physics and Astronomy (miscellaneous)

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Experimental determination of next-nearest-neighbor interlayer exchange coupling in ferromagnetic GaMnAs/GaAs : Be multilayers. / Lee, Hakjoon; Bac, Seul Ki; Lee, Sangyeop; Choi, Seonghoon; Yoo, Taehee; Lee, Sang Hoon; Liu, Xinyu; Furdyna, Jacek K.

In: Applied Physics Letters, Vol. 107, No. 19, 192403, 09.11.2015.

Research output: Contribution to journalArticle

Lee, Hakjoon ; Bac, Seul Ki ; Lee, Sangyeop ; Choi, Seonghoon ; Yoo, Taehee ; Lee, Sang Hoon ; Liu, Xinyu ; Furdyna, Jacek K. / Experimental determination of next-nearest-neighbor interlayer exchange coupling in ferromagnetic GaMnAs/GaAs : Be multilayers. In: Applied Physics Letters. 2015 ; Vol. 107, No. 19.
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