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Magnetic properties of full-Heusler alloy Co2Fe1-xMnxAl films grown by molecular-beam epitaxy

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6 Author(s)
Meng, K.K. ; State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, P.O. Box 912, Beijing 100083, People''s Republic of China ; Wang, S.L. ; Xu, P.F. ; Chen, L.
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We have investigated magnetic properties of single-crystalline full-Heusler alloy Co2Fe1-xMnxAl films (0<x<1) grown on GaAs (001) by molecular-beam epitaxy at different temperatures. It is found that as x increases, the films grown at 160 °C have complex magnetic phases, but show pure ferromagnetic properties when grown at 280 °C. We attribute this magnetic behavior to the competition between ferromagnetic and antiferromagnetic Mn–Mn interactions, which are proved by x-ray magnetic circular dichroism measurements. Moreover, we have investigated in-plane magnetic anisotropies of Co2Fe1-xMnxAl films with pure ferromagnetic phases and deduced the corresponding anisotropy constants which also remarkably depend on x.

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Applied Physics Letters  (Volume:97 ,  Issue: 23 )