Magnetization switching by microwaves initially rotating in opposite direction to precession

A common understanding of magnetization switching in microwave-assisted magnetization reversal is that the rotation direction of the microwaves should be the same as the precession direction of the magnetization. In this letter, however, we show that microwaves initially rotating opposite to the mag...

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Bibliographic Details
Published in:Applied physics express 2015-12, Vol.8 (12), p.123002
Main Author: Taniguchi, Tomohiro
Format: Article
Language:English
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Summary:A common understanding of magnetization switching in microwave-assisted magnetization reversal is that the rotation direction of the microwaves should be the same as the precession direction of the magnetization. In this letter, however, we show that microwaves initially rotating opposite to the magnetization precession destabilize the magnetization at an equilibrium and induce switching more efficiently when the microwave frequency depends on time. This argument is analytically deduced from an energy balance equation. We also establish a model satisfying this condition and confirm magnetization switching solely by microwaves by using numerical simulation.
ISSN:1882-0778
1882-0786
DOI:10.7567/APEX.8.123002