Biquadratic magnetic coupling effect in CoPt/Cr/Fe90Co10 orthogonal structures

IF 1.5 4区物理与天体物理 Q3 PHYSICS, APPLIED

Japanese Journal of Applied Physics Pub Date : 2024-01-04 DOI:10.35848/1347-4065/ad0e28

Chuhan Liu, Yuichiro Kurokawa, Naoki Hashimoto, Terumitsu Tanaka, Hiromi Yuasa

引用次数: 0

Abstract

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 Fe₉₀Co₁₀ 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.

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CoPt/Cr/Fe90Co10 正交结构中的双向磁耦合效应

在这项工作中，我们提出了在正交磁化结构中提高自旋扭矩振荡（STO）频率的模拟双向场 Hbq 贡献，并通过制备 Co/Pt 层压作为底部垂直磁各向异性层、Cr 或 Cu 作为间隔层以及实验实现 Fe90Co10 作为顶部自由层来实现这种正交结构。我们对铬-间隔层样品的观察结果表明，在实现磁饱和方面存在明显挑战，这突出了 Hbq 在抑制磁化反转方面的作用，以及它在拓宽 STO 电流范围和提高 STO 频率方面的潜力。这导致了正交结构中自旋转移力矩振荡的出现，并得到了强大的双四边形磁耦合的支持，从而在模拟中实现了高而稳定的 STO。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Japanese Journal of Applied Physics 物理-物理：应用

CiteScore

3.00

自引率

26.70%

发文量

818

审稿时长

3.5 months

期刊介绍： The Japanese Journal of Applied Physics (JJAP) is an international journal for the advancement and dissemination of knowledge in all fields of applied physics. JJAP is a sister journal of the Applied Physics Express (APEX) and is published by IOP Publishing Ltd on behalf of the Japan Society of Applied Physics (JSAP). JJAP publishes articles that significantly contribute to the advancements in the applications of physical principles as well as in the understanding of physics in view of particular applications in mind. Subjects covered by JJAP include the following fields: • Semiconductors, dielectrics, and organic materials • Photonics, quantum electronics, optics, and spectroscopy • Spintronics, superconductivity, and strongly correlated materials • Device physics including quantum information processing • Physics-based circuits and systems • Nanoscale science and technology • Crystal growth, surfaces, interfaces, thin films, and bulk materials • Plasmas, applied atomic and molecular physics, and applied nuclear physics • Device processing, fabrication and measurement technologies, and instrumentation • Cross-disciplinary areas such as bioelectronics/photonics, biosensing, environmental/energy technologies, and MEMS