Biquadratic magnetic coupling effect in CoPt/Cr/Fe 90 Co 10 orthogonal structures

In this work, we present the biquadratic field H bq contribution to increase a frequency of spin-torque oscillation (STO) in an orthogonal magnetization structure in simulation, and realize such an orthogonal structure by preparing Co/Pt lamination as the bottom perpendicular magnetic anisotropy lay...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2024-02, Vol.63 (2), p.2
Main Authors: Liu, Chuhan, Kurokawa, Yuichiro, Hashimoto, Naoki, Tanaka, Terumitsu, Yuasa, Hiromi
Format: Article
Language:English
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Summary:In this work, we present the biquadratic field H bq contribution to increase a frequency of spin-torque oscillation (STO) in an orthogonal magnetization structure in simulation, and realize such an orthogonal structure by preparing Co/Pt lamination as the bottom perpendicular magnetic anisotropy layer, Cr or Cu as the spacer, and experimentally realize Fe 90 Co 10 as the top free layer. Our observations of the Cr-spacer sample reveal a notable challenge in achieving magnetic saturation, underscoring the role of H bq in suppressing magnetization reversal and its potential to broaden the STO current range and increase the STO frequency. This leads to the manifestation of spin-transfer-torque oscillations in an orthogonal structure, bolstered by robust biquadratic magnetic coupling, thus attaining high and stable STOs in the simulations.
ISSN:0021-4922
1347-4065
DOI:10.35848/1347-4065/ad0e28