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Spin Torque Nano-Oscillator with an Exchange-Biased Free Rotating Layer

Journal of Magnetics, Volume 14, Number 4, 31 Dec 2009, Pages 168-171

Chun-Yeol You *

(Department of Physics, Inha University)

Abstract

We propose a new type of spin torque nano-oscillator structure with an exchange- biased free rotating layer. The proposed spin torque nano-oscillator consists of a fixed layer and a free rotating layer with an additional anti-ferromagnetic layer, which leads to an exchange bias in the free rotating layer. The spin dynamics of the exchange-biased free rotating layer can be described as an additional exchange field because the exchange bias manifests itself by the existance of a finite exchange bias field. The exchange bias field plays a similar role to that of a finite external field. Hence, microwave generation can be achieved without an external field in the proposed structure.

Keywords: spin transfer torque; microwave oscillator; anti-ferromagnetic layer; exchange bias

DOI: 10.4283/JMAG.2009.14.4.168

Full Text: PDF

Copyright(c) 2009 The Korean Magnetics Society All rights reserved. E-mail : komag@unitel.co.kr