Development of high-efficiency techniques of microwave-assisted magnetization switching

2016 Fiscal Year Final Research Report

• Project/Area Number: 26289083
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Electronic materials/Electric materials
• Research Institution: Tohoku University
• Principal Investigator: Okamoto Satoshi 東北大学, 多元物質科学研究所, 准教授 (10292278)
• Co-Investigator(Kenkyū-buntansha): 島津 武仁 東北大学, 学際科学フロンティア研究所, 教授 (50206182) ; 北上 修 東北大学, 多元物質科学研究所, 教授 (70250834) ; 菊池 伸明 東北大学, 多元物質科学研究所, 助教 (80436170)
• Research Collaborator: SATO KIMINORI 富士電機(株)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: スピンダイナミクス / 磁気記録

Outline of Final Research Achievements

In this study, we have investigated various approaches to improve the efficiency of microwave-assisted magnetization switching effect. First, we successfully developed novel quantitative evaluation methods for large cone angle magnetization precession in a nano-scale magnetic dot based on anomalous Hall effect (AHE) and x-ray magnetic circular dichroism (XMCD) detection techniques. Then, we studied the microwave-assisted magnetization switching against various factors, such as the interlayer coupling in a dot composed of two magnetic layers, the effective gyromagnetic ratio in ferromagnetic materials, and inter-grain magnetic interaction in granular magnetic films. It is well verified that these factors can be significantly modify the microwave-assisted switching behavior. These findings are beneficial for practical application of the microwave-assisted magnetization switching.

Free Research Field

工学