Direct observation of magnetic process in quasi-antiferromagnet by high-resolution Kerr microscopy

We investigated the relationship between the magnetic hysteresis loop and domain structure modulation of an artificial material, a quasi-antiferromagnet (AFM) with domains of alternating antiparallel magnetization fabricated by a strong 90° magnetic coupling between two ferromagnetic layers through...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2021-05, Vol.60 (SB), p.SBBI05
Main Authors: Hashimoto, Naoki, Horiike, Shuu, Kurokawa, Yuichiro, Tanaka, Terumitsu, Chang, Po-Chun, Lin, Wen-Chin, Yuasa, Hiromi
Format: Article
Language:English
Subjects:
Antiferromagnetism
Atomic force microscopy
Coupling coefficients
Domains
Ferromagnetism
High resolution
High-resolution Kerr microscopy
Hysteresis loops
Image resolution
Magnetic structure
Magnetization curves
Magnetization reversal
Micromagnetic simulation
Nucleation
Quasi-antiferromagnet
Spintronics
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Description
Summary:We investigated the relationship between the magnetic hysteresis loop and domain structure modulation of an artificial material, a quasi-antiferromagnet (AFM) with domains of alternating antiparallel magnetization fabricated by a strong 90° magnetic coupling between two ferromagnetic layers through an Fe–O thin layer. High-resolution Kerr images show simultaneous magnetization rotation, nucleation, and growth of stripe-type domains with maintained magnetization along the longitudinal direction of the domain. The nucleation and growth were dominant in the magnetization reversal of the quasi-AFM. By fitting not only the magnetization curve but also the domain structure to the Landau–Lifshitz–Gilbert equation, the 90° coupling coefficients were properly obtained, which enables us to design the magnetic structure of the quasi-AFM.
ISSN:0021-4922
1347-4065
DOI:10.35848/1347-4065/abe5c2