Magnetization reversal process in Fe/FePt films

A soft/hard Fe/FePt bilayer with perpendicular magnetization was prepared on a glass substrate. Controlling the Fe layer thickness allowed modification of the hysteresis loops from rigid magnet with perpendicular magnetization to exchange-spring like magnet with parallel magnetization due to the nan...

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Bibliographic Details
Published in:Applied physics letters 2010-01, Vol.96 (3), p.032505-032505-3
Main Authors: Tsai, Jai-Lin, Tzeng, Hsin-Te, Lin, Guo-Bin
Format: Article
Language:English
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Summary:A soft/hard Fe/FePt bilayer with perpendicular magnetization was prepared on a glass substrate. Controlling the Fe layer thickness allowed modification of the hysteresis loops from rigid magnet with perpendicular magnetization to exchange-spring like magnet with parallel magnetization due to the nanoscale soft/hard interface coupling. For rigid magnetic films, the magnetization was reversed at a single switching field and interpreted by the two-spin model. In an exchange-spring like film, the in-plane magnetization reversal process was in two-steps and resulted from domain wall nucleation and propagation from the Fe layer into the FePt layer.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3293444