Theoretical study on spin torque induced magnetization dynamics in thermally activated region

2015 Fiscal Year Final Research Report

• Project/Area Number: 25790044
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Applied materials
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Taniguchi Tomohiro 国立研究開発法人産業技術総合研究所, スピントロニクス研究センター, 研究員 (90635806)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: スピントロニクス / 理論 / スピントルク

Outline of Final Research Achievements

The purpose of this research is to develop a theory of magnetization dynamics in nanostructured ferromagnetic multilayer in the presence of both spin transfer torque and thermal fluctuations. Solving the stochastic equation of motion of the magnetization, we derive a formula of the switching probability of the magnetization in thermally activated region excited by spin torque. This theory will enable to establish method to evaluate the thermal stability of the ferromagnet with high accuracy. It was also found that the present theory can be applied to other phenomena, such as spin torque oscillator and microwave assisted magnetization reversal.

Free Research Field

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