Current Driven Magnetic Damping in Dipolar-Coupled Spin System

Magnetic damping of the spin, the decay rate from the initial spin state to the final state, can be controlled by the spin transfer torque. Such an active control of damping has given birth to novel phenomena like the current-driven magnetization reversal and the steady spin precession. The spintron...

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Bibliographic Details
Published in:Scientific reports 2012-07, Vol.2 (1), p.531-531, Article 531
Main Authors: Lee, Sung Chul, Pi, Ung Hwan, Kim, Keewon, Kim, Kwang Seok, Shin, Jaikwang, -In Chung, U
Format: Article
Language:English
Subjects:
639/301
639/766/25
639/925/357/997
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Humanities and Social Sciences
Magnetic fields
multidisciplinary
Random access memory
Science
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Summary:Magnetic damping of the spin, the decay rate from the initial spin state to the final state, can be controlled by the spin transfer torque. Such an active control of damping has given birth to novel phenomena like the current-driven magnetization reversal and the steady spin precession. The spintronic devices based on such phenomena generally consist of two separate spin layers, i.e., free and pinned layers. Here we report that the dipolar coupling between the two layers, which has been considered to give only marginal effects on the current driven spin dynamics, actually has a serious impact on it. The damping of the coupled spin system was greatly enhanced at a specific field, which could not be understood if the spin dynamics in each layer was considered separately. Our results give a way to control the magnetic damping of the dipolar coupled spin system through the external magnetic field.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep00531