Anomalously Damped Heat-Assisted Route for Precessional Magnetization Reversal in an Iron Garnet

A heat-assisted route for subnanosecond magnetic recording is discovered for the dielectric bismuth-substituted yttrium iron garnet, known for possessing small magnetic damping. The experiments and simulations reveal that the route involves nonlinear magnetization precession, triggered by a transien...

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Bibliographic Details
Published in:Physical review letters 2019-01, Vol.122 (2), p.027202-027202, Article 027202
Main Authors: Davies, C S, Prabhakara, K H, Davydova, M D, Zvezdin, K A, Shapaeva, T B, Wang, S, Zvezdin, A K, Kirilyuk, A, Rasing, Th, Kimel, A V
Format: Article
Language:English
Subjects:
Anisotropy
Bismuth
Dissimilar materials
Iron
Magnetic damping
Magnetic recording
Magnetism
Magnetization reversal
Yttrium
Yttrium-iron garnet
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Summary:A heat-assisted route for subnanosecond magnetic recording is discovered for the dielectric bismuth-substituted yttrium iron garnet, known for possessing small magnetic damping. The experiments and simulations reveal that the route involves nonlinear magnetization precession, triggered by a transient thermal modification of the growth-induced crystalline anisotropy in the presence of a fixed perpendicular magnetic field. The pathway is rendered robust by the damping becoming anomalously large during the switching process. Subnanosecond deterministic magnetization reversal was achieved within just one-half of a precessional period, and this mechanism should be possible to implement in any material with suitably engineered dissimilar thermal derivatives of magnetization and anisotropy.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.122.027202