Reserch on dynamical process of spinwave-assisted magnetization reversal and observation of spinwaves excited along thickness direction

2016 Fiscal Year Final Research Report

• Project/Area Number: 26249052
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Electron device/Electronic equipment
• Research Institution: Keio University
• Principal Investigator: Nozaki Yukio 慶應義塾大学, 理工学部(矢上), 教授 (30304760)
• Co-Investigator(Kenkyū-buntansha): 渡邉 紳一 慶應義塾大学, 理工学部, 准教授 (10376535)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 強磁性共鳴 / スピン波 / 磁気記録 / 非線形ダイナミクス

Outline of Final Research Achievements

In order to study a magnetization switching assisted by a spin waves along a thickness direction of an exchange coupled composite (ECC) medium, we developed a micro-MOKE measurement system which enables to spatially resolve the magnetization dynamics. In addition, we succeeded to demonstrate a temporarily resolved observation of nonlinear magnetization dynamics in nonequilibrium state of nano-scaled ferromagnet. From the dependence of a critical switching frequency of an ECC medium on the strength of interlayer exchange coupling, we experimentally confirmed that the spin wave assisted magnetization reversal could be realized even in ultra-thin ECC media with a thickness of 16 nm.

Free Research Field

磁性物理学