Study on magnetization reversal and dynamics induced by lattice oscillation

2015 Fiscal Year Final Research Report

• Project/Area Number: 25610098
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: University of Hyogo
• Principal Investigator: Yamaguchi Akinobu 兵庫県立大学, 高度産業科学技術研究所, 准教授 (70423035)
• Co-Investigator(Kenkyū-buntansha): TATARA Gen 国立研究開発法人理学研究所, 創発物性科学研究センター・スピン物性理論研究チーム, チームリーダー (10271529) ; UTSUMI Yuichi 兵庫県立大学, 高度産業科学技術研究所, 教授 (80326298)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 磁壁移動 / 表面弾性波 / スピンダイナミクス / 磁化反転

Outline of Final Research Achievements

Magnetization reversal, that has been investigated through the ages, is crucial important for both fundamental magnetism and engineering applications. Recently, on the technological application of new spintronic devices, microscale and nanoscale ferromagnets have proven to be appropriate for clarifying the spintronics associated with magnetization dynamics induced by spin-polarized current and voltage. However, the Joule heating and high current density required for the magnetization reversal are problems for device applications. In this study, we focused on that the magnetic moments tightly coupled with their lattice within a crystal. We investigated that the magnetization dynamics induced by the surface acoustic wave (SAW), spin-polarized current, and microwave magnetic fields. By comparison of theoretical approach, micromagnetic calculations and experimental results, we qualitatively understood the magnetization dynamics induced by the current, magnetic fields, and temperature.

Free Research Field

磁気物理