Interfacial magnetic vortex formation in exchange-coupled hard-soft magnetic bilayers

Zhang, X. H.; Gao, T. R.; Fang, L.; Fackler, S.; Borchers, J. A.; Kirby, B. J.; Maranville, B. B.; Lofland, S. E.; N'Diaye, A. T.; Arenholz, E.; Ullah, A.; Cui, J.; Skomski, R.; Takeuchi, I.

doi:10.1016/j.jmmm.2022.169627

Title: Interfacial magnetic vortex formation in exchange-coupled hard-soft magnetic bilayers

Journal Article · 17 June 2022 · Journal of Magnetism and Magnetic Materials

DOI: https://doi.org/10.1016/j.jmmm.2022.169627 · OSTI ID:1992459

Zhang, X. H. ^[1]; Gao, T. R. ^[1]; Fang, L. ^[1]; Fackler, S. ^[1]; Borchers, J. A. ^[2]; Kirby, B. J. ^[2]; Maranville, B. B. ^[2]; Lofland, S. E. ^[3]; N'Diaye, A. T. ^[4]; Arenholz, E. ^[4]; Ullah, A. ^[5]; Cui, J. ^[6]; Skomski, R. ^[5]; Takeuchi, I. ^[1]

University of Maryland, College Park, MD (United States)
National Institute of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
Rowan University, Glassboro, NJ (United States)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
University of Nebraska, Lincoln, NE (United States)
Ames Laboratory (AMES), Ames, IA (United States); Iowa State University, Ames, IA (United States)

The exchange coupling between a hard magnetic layer MnBi and a soft magnetic layer Co-Fe has been found to significantly improve the maximum energy product. In this work, the spin structure of exchange coupled MnBi:Co-Fe bilayers is experimentally investigated by X-ray magnetic circular dichroism (XMCD) and polarized neutron reflectometry (PNR). We find that the out-of-plane magnetization reversal process of the MnBi:Co-Fe bilayer structure involves formation of a curling-type twisting of the magnetization in the film plane at low or intermediate reversal fields. Additionally, micromagnetic simulations are further performed to provide a detailed view of the spins at the curling center. Reminiscent of chiral spin structures known as spin bobbers, this curling in the exchange-coupled hard-soft magnetic bilayers is a new type of skyrmionic spin structure and worth further investigation.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1992459

Journal Information:: Journal of Magnetism and Magnetic Materials, Journal Name: Journal of Magnetism and Magnetic Materials Vol. 560; ISSN 0304-8853

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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