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Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/15382

Title: Magnetic Reversal Study of Au–FePt Thin Films with Very High Coercivity
Authors: Yuan, F. T.;Chen, S. K.;Horng, Lance;Tsai, J. L.
Contributors: 物理學系
Keywords: Bilayer thin films;Coercivity enhancement;Domain structure;Domain-wall motion;FePt;Magnetic reversal behavior;Magnetization rotation
Date: 2005-10
Issue Date: 2013-02-05T02:18:54Z
Publisher: IEEE
Abstract: Magnetic reversal behaviors of Au (60 nm)-FePt (x nm) thin films with various x values are investigated. A high temperature heat treatment at 800�C was applied to obtain an isolated microstructure with L10 FePt particles embedded in a face-centered cubic gold matrix through interfacial diffusion. The coercivity of the thin films was increased from 13.6 kOe to a maximum value of 30.0 kOe as the thickness of the FePt layer was decreased from 200 to 10 nm. From the dc demagnetization and isothermal remanence magnetization measurements, we found that the bilayer sample with x=10 exhibits larger reversible magnetization. The coercive mechanism was found to be controlled by the magnetization rotation of the isolated FePt particles. As x is increased, the reversal behavior is changed into a domain-wall motion mode gradually. The magnetic force microscopy investigations further confirm the change of mechanism. The domain-wall motion appears to result from the formation of large multidomain grains. Considering the relation of reversal behavior and the coercivity, we thus conclude that the removal of domain walls is beneficial for hard magnetic performance.
Relation: IEEE Trans. on Magnetics, 41(10): 3346-3348
Appears in Collections:[物理學系] 期刊論文

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