Magnetization reversal in perpendicularly magnetized L10 FePd/FePt heterostructures
Magnetization reversal in perpendicularly magnetized L10 FePd/FePt heterostructures
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垂直磁化的 L10 FePd/FePt 异质结构中的磁化反转
DOI：
10.1063/1.4890936
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发表时间：
2014-07-21
影响因子：
3.2
通讯作者：
Zhou, S. M.
中科院分区：
文献类型：
--
作者：
Ma, L.;Gilbert, D. A.;Zhou, S. M.
研究了不同FePd厚度的L1（0）FePd/FePt（24 nm）外延薄膜垂直弹簧磁体的磁化反转过程。对于薄的FePd层，反转是由反转的气泡畴的成核开始的，然后主要由畴壁的脱钉和横向移动来完成。对于厚FePd层，磁化反转主要由成核过程而不是壁运动支配，导致在更负的磁场下气泡畴的密度增加。随着FePd厚度的增加，开关场显著减小，并且由于FePd中的倾斜磁化，在局部形成交换弹簧。这些结果产生于不同的强垂直磁各向异性之间的相互作用，在FePd和FePt和层依赖的结构修改，这是重要的高密度磁记录介质。(C)2014 AIP出版有限责任公司。
The magnetization reversal process is investigated in perpendicular spring magnets of epitaxial L1(0) FePd/FePt (24 nm) thin films with varying FePd thickness. For thin FePd layers, the reversal is initiated by the nucleation of reversed bubble domains and is then mainly accomplished by the depinning and lateral movement of domain walls. For thick FePd layers, the magnetization reversal is predominantly governed by the nucleation process rather than wall motion, resulting in an increased density of bubble domains at more negative magnetic fields. The switching field is reduced significantly with increasing FePd thickness and exchange springs are formed locally due to a tilted magnetization in the FePd. These results arise from the interplay between differently strong perpendicular magnetic anisotropies in FePd and FePt and from layer dependent structural modifications, which is important for high density magnetic recording media. (C) 2014 AIP Publishing LLC.