Publication: Interfacial exchange coupling in Fe/(Ga,Mn)As bilayers
Issued Date
2014-06-16
Resource Type
ISSN
1550235X
10980121
10980121
Other identifier(s)
2-s2.0-84902668542
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Mahidol University
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SCOPUS
Bibliographic Citation
Physical Review B - Condensed Matter and Materials Physics. Vol.89, No.22 (2014)
Suggested Citation
A. M. Alsmadi, Y. Choi, D. J. Keavney, K. F. Eid, B. J. Kirby, X. Liu, J. Leiner, K. Tivakornsasithorn, M. Dobrowolska, J. K. Furdyna Interfacial exchange coupling in Fe/(Ga,Mn)As bilayers. Physical Review B - Condensed Matter and Materials Physics. Vol.89, No.22 (2014). doi:10.1103/PhysRevB.89.224409 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/34114
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Title
Interfacial exchange coupling in Fe/(Ga,Mn)As bilayers
Abstract
We carried out a systematic study of magnetic order and magnetic interlayer coupling in Fe/(Ga,Mn)As bilayers using superconducting quantum interference device magnetometry, polarized neutron reflectometry, element-specific x-ray absorption spectroscopy, x-ray magnetic circular dichroism, and x-ray specular reflectivity. Our results clearly show that Fe/(Ga,Mn)As bilayers are strongly exchange coupled at the interface. However, contrary to recent reports in the literature, we observe a ferromagnetic rather than antiferromagnetic coupling between the magnetic moments of the Mn ions and the Fe layer. It is interesting in this context that the surface region of the (Ga,Mn)As layer that is in direct contact with the Fe film displays a nearly identical coercivity to that of Fe (indicating perfect ferromagnetic coupling of that region), while the bulk of the (Ga,Mn)As layer, which is more weakly ferromagnetically coupled with Fe, shows a significantly smaller coercive field. © 2014 American Physical Society.