Spin wave-assisted reduction in switching field of highly coercive iron-platinum magnets

Takeshi Seki (), Kazutoshi Utsumiya, Yukio Nozaki, Hiroshi Imamura and Koki Takanashi
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Takeshi Seki: Institute for Materials Research, Tohoku University
Kazutoshi Utsumiya: Institute for Materials Research, Tohoku University
Yukio Nozaki: Keio University
Hiroshi Imamura: National Institute of Advanced Industrial Science and Technology
Koki Takanashi: Institute for Materials Research, Tohoku University

Nature Communications, 2013, vol. 4, issue 1, 1-6

Abstract: Abstract Recent rapid progress in spintronic and magnetic storage nanodevices has required nanomagnets to balance competing goals for high coercive field and low switching field. However, a decisive route for highly efficient magnetization switching has not been established yet. Here we propose a novel switching method using a spin wave of magnetic structures twisted in a nanometre scale. We have experimentally demonstrated extremely low field-magnetization switching in a highly coercive FePt by using a spin wave excited in a soft magnetic permalloy (Ni81Fe19), where permalloy is exchange-coupled to FePt through the interface. We can tune the switching field by varying the magnitude and frequency of the radio frequency magnetic field, and a significant decrease in switching field by one order of magnitude is achieved under the optimum conditions. The spin wave-assisted magnetization switching is a promising technique for ultralow-energy magnetization manipulation.

Date: 2013
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DOI: 10.1038/ncomms2737

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