Anomalous damping dependence of the switching time in Fe/FePt bilayer recording media

Razvan V. Ababei; Matthew O.A. Ellis; Richard F.L. Evans; Roy W. Chantrell

doi:10.1103/PhysRevB.99.024427

Anomalous damping dependence of the switching time in Fe/FePt bilayer recording media

Razvan V. Ababei, Matthew O.A. Ellis, Richard F.L. Evans, Roy W. Chantrell

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

Abstract

Gilbert damping plays a significant role in magnetic reversal processes, and it determines the timescale of the switching. Here we investigate the properties of exchange-coupled composite media and the dependence of the switching time on the damping constant of the soft layer using atomistic spin dynamics. For a bilayer Fe/FePt medium, we find an anomalous increase of the switching time with increasing soft layer damping constant. The reversal occurs via a high-temperature exchange spring, and we show that the increase in the switching time is related to a corresponding increase in the time to establish the exchange spring. This phenomenon is delicately balanced in that the switching time increase occurs only in fields close to the coercivity.

Original language	English
Article number	024427
Number of pages	6
Journal	Physical Review B
Volume	99
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.99.024427
Publication status	Published - 24 Jan 2019

Bibliographical note

© 2019 American Physical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

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10.1103/PhysRevB.99.024427

Anomalous damping dependence of the switching time in Fe/FePt bilayer recording media
© 2019 American Physical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.
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Anomalous damping dependence of the switching time in Fe/FePt bilayer recording media

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