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

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

doi:10.1016/j.jmmm.2022.169627

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

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

Physics

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

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. 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.

Original language	English (US)
Article number	169627
Journal	Journal of Magnetism and Magnetic Materials
Volume	560
DOIs	https://doi.org/10.1016/j.jmmm.2022.169627
State	Published - Oct 15 2022

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1016/j.jmmm.2022.169627

Cite this

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. (2022). Interfacial magnetic vortex formation in exchange-coupled hard-soft magnetic bilayers. Journal of Magnetism and Magnetic Materials, 560, Article 169627. https://doi.org/10.1016/j.jmmm.2022.169627

@article{36b0daf533494ffcb78bcf2fa6b2bf0b,

title = "Interfacial magnetic vortex formation in exchange-coupled hard-soft magnetic bilayers",

abstract = "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. 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.",

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

note = "Publisher Copyright: {\textcopyright} 2022",

year = "2022",

month = oct,

day = "15",

doi = "10.1016/j.jmmm.2022.169627",

language = "English (US)",

volume = "560",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier",

}

TY - JOUR

T1 - Interfacial magnetic vortex formation in exchange-coupled hard-soft magnetic bilayers

AU - Zhang, X. H.

AU - Gao, T. R.

AU - Fang, L.

AU - Fackler, S.

AU - Borchers, J. A.

AU - Kirby, B. J.

AU - Maranville, B. B.

AU - Lofland, S. E.

AU - N'Diaye, A. T.

AU - Arenholz, E.

AU - Ullah, A.

AU - Cui, J.

AU - Skomski, R.

AU - Takeuchi, I.

PY - 2022/10/15

Y1 - 2022/10/15

N2 - 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. 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.

AB - 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. 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.

UR - http://www.scopus.com/inward/record.url?scp=85133801546&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85133801546&partnerID=8YFLogxK

U2 - 10.1016/j.jmmm.2022.169627

DO - 10.1016/j.jmmm.2022.169627

M3 - Article

AN - SCOPUS:85133801546

SN - 0304-8853

VL - 560

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

M1 - 169627

ER -

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

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this