Improvement of spin-torque oscillator with magnetic vortex and inter-layer coupling

磁涡和层间耦合自旋扭矩振荡器的改进

• 批准号: 24760014
• 负责人: YAKATA Satoshi
• 金额: $ 2.41万
• 依托单位: Fukuoka Institute of Technology (2013)Kyushu University (2012)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-24760014/
• 关键词: スピントロニクス; 磁気渦; 発振素子; 熱安定性; 磁性; 層間交換結合; スピントルクオシレータ

Spin torque oscillator is one of the candidates for next generation oscillator with low power consumption and high frequency, over GHz. One of the practical problem is thermal stability because spin torque oscillator is small. Our purpose is to improve thermal stability of spin torque oscillator with magnetic vortex and exchange coupled ferromagnetic layer. At first, we developed novel method to evaluate thermal stability of magnetic vortex in ferromagnetic layer. This method allowed us to map the potential for magnetic vortex in ferromagnetic dot. We also succeeded to fabricate spin torque oscillator with magnetic vortex. It showed higher Q-value compared with that of conventional spin torque oscillator due to its higher thermal stability. Using these technique, we could evaluate spin torque oscillator with exchange coupled ferromagnetic layers.

自旋转矩振荡器是低功耗、高频率（GHz以上）的下一代振荡器的候选对象之一。由于自旋转矩振荡器体积小，热稳定性是一个实际问题。本文的目的是提高磁涡流和交换耦合铁磁层的自旋力矩振荡器的热稳定性。首先，我们提出了一种评价铁磁层中磁涡热稳定性的新方法。这种方法使我们能够绘制铁磁点的磁涡势。我们还成功地制作了磁涡流自旋转矩振荡器。由于具有较高的热稳定性，与传统的自旋力矩振荡器相比，其q值更高。利用这些技术，我们可以对具有交换耦合铁磁层的自旋转矩振荡器进行评价。

项目成果

Ferromagnetic Resonance in Exchange-Coupled NiFe/FeMn Films and Its Control

• DOI: 10.1109/tmag.2012.2201925
• 发表时间: 2012-10
• 期刊: IEEE Transactions on Magnetics
• 影响因子: 2.1
• 作者: Shaojie Hu;K. Kiseki;S. Yakata;T. Kimura

Giant spin accumulation at room temperature in Co2FeSi/Cu lateral spin valves

Co2FeSi/Cu 横向自旋阀在室温下存在巨大的自旋积累

• 发表时间: 2012
• 作者: S. Oki;N. Hashimoto;S. Yamada;T. Kimura;M. Miyao and K. Hamaya
• 通讯作者: M. Miyao and K. Hamaya

Resonant vortex core oscillation detected by using anisotropic magnetoresistance

利用各向异性磁阻检测共振涡核振荡

• 发表时间: 2013
• 作者: Y. Okamura;K. Nakao;N. Okada;K. Yamane;and K. Tadatomo;Xiaomin Cui,Kohei Kiseki,Satoshi Yakata,Takashi Kimura
• 通讯作者: Xiaomin Cui,Kohei Kiseki,Satoshi Yakata,Takashi Kimura

Possibility for ferromagnetic resonance control using exchange-coupled NiFe/FeMn film

使用交换耦合 NiFe/FeMn 薄膜进行铁磁共振控制的可能性

• 发表时间: 2012
• 作者: K. Kiseki;S. Hu;S. Yakata;T. Kimura
• 通讯作者: T. Kimura

Formations of magnetic vortices in a chain array of triangle Py dots and an isosceles triangle Py dot

• DOI: 10.1063/1.3673349
• 发表时间: 2012-02
• 期刊: Journal of Applied Physics
• 影响因子: 3.2
• 作者: M. Miyata;K. Kiseki;S. Yakata;H. Wada;T. Kimura