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Appl. Phys. Express 3 (2010) 033001 (3 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Coupled-Mode Excitations Induced in an Antiferromagnetically Coupled Multilayer by Spin-Transfer Torque

Takeshi Seki, Hiroyuki Tomita, Masashi Shiraishi, Teruya Shinjo, and Yoshishige Suzuki

Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan

(Received December 21, 2009; accepted February 8, 2010; published online February 26, 2010)

Auto-oscillation of the magnetization in an Fe/Cr/Fe antiferromagnetically coupled multilayer was induced by spin-transfer torque. The acoustic mode, a coupled mode in the multilayer, was excited when a dc bias current was applied at relatively small magnetic fields. The external magnetic field dependence of the oscillation frequency is explained by a macrospin model with an antiferromagnetic coupling field. The excitation of the optical mode is also discussed. ©2010 The Japan Society of Applied Physics

URL: http://apex.ipap.jp/link?APEX/3/033001/
DOI: 10.1143/APEX.3.033001


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