Fabrication of twisted magnetic structure materials for high-performance spin devices

2015 Fiscal Year Final Research Report

• Project/Area Number: 25709056
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Physical properties of metals/Metal-base materials
• Research Institution: Tohoku University
• Principal Investigator: SEKI Takeshi 東北大学, 金属材料研究所, 准教授 (40579611)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 磁気構造制御 / スピンデバイス / 磁化ダイナミクス / ナノ構造 / 積層制御

Outline of Final Research Achievements

The main purpose of this research project was to develop artificially-controlled magnetic structures having spatially twisted magnetization configurations in order to realize high performance spin devices. We successfully controlled the twisted magnetic structures by using the L10-FePt | Ni81Fe19 exchanged-coupled bilayers, and systematically investigated the magnetization dynamics for the twisted magnetic structures. We demonstrated the high efficient magnetization switching in the perpendicular configuration owing to the characteristic dynamics of the magnetic vortex formed in the bilayer, and examined the spin torque for nonuniform magnetic structures by exploiting the twisted magnetic structures. Also, we successfully observed the spin motive force in the twisted magnetic structure, which originated from the spin wave dynamics.

Free Research Field

磁性材料学