Magnetic noise spectra and spin transfer torque of a magnetic tunnel junction with an exchange biased synthetic ferrimagnetic reference layer

被引：11

作者：

You, Chun-Yeol ^{[2
]}

Yoon, Jungbum ^{[2
]}

Park, Seung-Young ^{[3
]}

Yuasa, Shinji ^{[4
]}

Jung, Myung-Hwa ^{[1
]}

机构：

[1] Sogang Univ, Dept Phys, Seoul 121742, South Korea

[2] Inha Univ, Dept Phys, Inchon 402751, South Korea

[3] Korea Basic Sci Inst, Div Mat Sci, Taejon 305333, South Korea

[4] Natl Inst Adv Ind Sci & Tech, Nanoelect Res Ctr, Tsukuba, Ibaraki 3058568, Japan

来源：

CURRENT APPLIED PHYSICS | 2011年 / 11卷 / 02期

关键词：

Magnetic tunnel junction; Magnetic noise spectra; Spin transfer torque; Thermal spin dynamics; FERROMAGNETIC-RESONANCE; DEPENDENCE; STABILITY; DEVICES; FILMS;

D O I：

10.1016/j.cap.2010.11.128

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate magnetic thermal noise spectra in magnetic tunneling junction with spin transfer torque. The basic structure of the examined magnetic tunneling junction is PtMn/F-3/Ru/F-2/MgO/F-1, where F-1,F-2,F-3 are ferromagnetic layers. F-1 acts as a soft free layer, while PtMn/F-3/Ru/F-2, an exchange biased synthetic ferrimagnet structure, serves as a fixed reference layer. With the assumption of rigid fixed reference layer, the magnetic thermal noise is only related with the thermal motion of the free layer spins. However, we find additional resonance peaks in the magnetic noise spectra, which correspond to the thermal motion of the reference layer spins. Furthermore, the magnetic noise spectra show intricate field dependences, which are related with the spin dynamics of the reference layer induced by spin transfer torque. (C) 2011 Elsevier B. V. All rights reserved.

引用

页码：E92 / E94

页数：3

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