Interface mixing and its impact on exchange coupling in exchange biased systems

Manna, P. K.; Skoropata, E.; Ting, Y-W; Lin, K-W; Freeland, J. W.; van Lierop, J.

doi:10.1088/0953-8984/28/48/486004

Title: Interface mixing and its impact on exchange coupling in exchange biased systems

Journal Article · Wed Oct 05 00:00:00 EDT 2016 · Journal of Physics. Condensed Matter

DOI:https://doi.org/10.1088/0953-8984/28/48/486004· OSTI ID:1378109

Manna, P. K. ^[1]; Skoropata, E. ^[1]; Ting, Y-W ^[2]; Lin, K-W ^[2]; Freeland, J. W. ^[3]; van Lierop, J. ^[1]

Univ. of Manitoba, Winnipeg MB (Canada). Dept. of Physics and Astronomy
National Chung Hsing Univ., Taichung (Taiwan). Dept. of Materials Science and Engineering
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source

Exchange bias and interlayer exchange coupling are interface driven phenomena. Since an ideal interface is very challenging to achieve, a clear understanding of the chemical and magnetic natures of interfaces is pivotal to identify their influence on the magnetism. We have chosen Ni₈₀Fe₂₀/CoO(t_CoO)/Co trilayers as a model system, and identified non-stoichiometric Ni-ferrite and Co-ferrite at the surface and interface, respectively. These ferrites, being ferrimagnets typically, should influence the exchange coupling. But, in our trilayers the interface ferrites were found not to be ferro-or ferri-magnetic; thus having no observable influence on the exchange coupling. Our analysis also revealed that (i) interlayer exchange coupling was present between Ni₈₀Fe₂₀ and Co even though the interlayer thickness was significantly larger than expected for this phenomenon to happen, and (ii) the majority of the CoO layer (except some portion near the interface) did not contribute to the observed exchange bias. Here, we also identified that the interlayer exchange coupling and the exchange bias properties were not interdependent.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Natural Sciences and Engineering Research Council of Canada (NSERC); Canada Foundation for Innovation (CFI)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1378109

Alternate ID(s):: OSTI ID: 1328246

Journal Information:: Journal of Physics. Condensed Matter, Vol. 28, Issue 48; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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Title: Interface mixing and its impact on exchange coupling in exchange biased systems

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