Spin-wave Devices for Collecting and Detecting Magnetic Nano-particles

2014 Fiscal Year Final Research Report

• Project/Area Number: 25630146
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Electron device/Electronic equipment
• Research Institution: Nagoya University
• Principal Investigator: IWATA Satoshi 名古屋大学, エコトピア科学研究所, 教授 (60151742)
• Co-Investigator(Kenkyū-buntansha): KATO Takeshi 名古屋大学, 工学研究科, 准教授 (50303665)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: スピン波 / 磁性微粒子 / バイオセンサ / 磁性多層膜 / スピンダイナミクス / ダンピング定数

Outline of Final Research Achievements

In order to develop spin-wave devices for detection of biological molecules using magnetic nano-particles, perpendicular magnetized films have been prepared and their spin dynamics were measured. Perpendicular magnetized Co/Ni multilayers with period of 1 nm exhibit large perpendicular anisotropy, where the multilayers with Pt underlayer show larger anisotropy compared to the films with Ta underlayer. In spin dynamics observation using pump-prove method, precession of magnetization caused by a pump light sustained during over 300 ps. Damping parameter obtained fitting method of Co/Ni multilayers were approximately 0.020. This value is less than half value of 0.046 for GdFeCo amorphous films. These results implies that Co/Ni multilayers were appropriate material for spin-wave devices.

Free Research Field

ナノマグネティックス