Zhang, X.
, Gao, T.
, Fang, L.
, Fackler, S.
, Borchers, J.
, Kirby, B.
, Maranville, B.
, Lofland, S.
, N'Diaye, A.
, Arenholz, E.
, Ullah, A.
, Cui, J.
, Skomski, R.
and Takeuchi, I.
(2022),
Chiral Spin Bobbers in Exchange-Coupled Hard-Soft Magnetic Bilayers, Physical Review Materials
(Accessed May 19, 2022)
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Chiral Spin Bobbers in Exchange-Coupled Hard-Soft Magnetic Bilayers
Published
Author(s)
X. H. Zhang, T. R. Gao, L. Fang, S. Fackler, , , , S. E. Lofland, A. T. N'Diaye, E. Arenholz, A. Ullah, J. Cui, R. Skomski, Ichiro Takeuchi
Abstract
The spin structure of exchange-coupled MnBi:Co-Fe bilayers is investigated by X-ray magnetic circular dichroism (XMCD), polarized neutron reflectometry (PNR), and micromagnetic simu-lations. The purpose of the present research is two-fold. First, the current search for new permanent-magnet materials includes hard-soft nanocomposites, and the analysis of coercivity mechanisms in these structures is an important aspect of this quest. Second, topological micro-magnetic structures such as skyrmions have recently become of intense fundamental and applied research, for example in the context of spin-based electronics. We find that the magnetization reversal of the MnBi:Co-Fe bilayer structure involves a curling-type twisting of the magnetization in the film plane. This curling in the exchange-coupled hard-soft magnetic bilayers is reminiscent of chiral spin structures known as bobbers and, in fact, establishes a new type of skyrmionic spin structure.Citation
Physical Review Materials
Pub Type
Journals
Keywords
Permanent magnet, Neutron reflectivity, Chiral bobbers, Exchange coupling
Citation
Created April 13, 2022