Chemical Composition Tuning of the Anomalous Hall Effect in Isoelectronic L10FePd1-xPtx Alloy Films
Chemical Composition Tuning of the Anomalous Hall Effect in Isoelectronic L10FePd1-xPtx Alloy Films
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DOI：
10.1103/physrevlett.109.066402
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发表时间：
2012-08-08
影响因子：
8.6
通讯作者：
Zhou, S. M.
中科院分区：
文献类型：
--
作者：
He, P.;Ma, L.;Zhou, S. M.
从实验和理论上研究了L1（0）FePd（1-x）Pt（x）合金薄膜的反常霍尔效应（AHE）。我们发现，通过增加Pt组分x，对AHE的本征贡献（sigma（int）（AH））可以显著增加，而非本征侧跳贡献（sigma（sj）（AH））可以从略大于L1（0）FePd中的sigma（int）（AH）连续减小到远小于L1（0）FePt中的sigma（int）（AH）。我们表明，这种化学成分调谐的内在贡献是由更强的自旋-轨道耦合强度的Pd/Pt网站时，较轻的Pd原子被较重的Pt原子取代。我们的研究结果提供了一种手段，操纵铁磁合金中的竞争AHE机制，充分了解AHE和铁磁合金的技术应用。
The anomalous Hall effect (AHE) in L1(0)FePd(1-x)Pt(x) alloy films is studied both experimentally and theoretically. We find that the intrinsic contribution (sigma(int)(AH)) to the AHE can be significantly increased, whereas the extrinsic side-jump contribution (sigma(sj)(AH)) can be continuously reduced from being slightly larger than sigma(int)(AH) in L1(0) FePd to being much smaller than sigma(int)(AH) in L1(0) FePt, by increasing the Pt composition x. We show that this chemical composition tuning of the intrinsic contribution is afforded by the stronger spin-orbit coupling strength on the Pd/Pt site when the lighter Pd atoms are replaced by the heavier Pt atoms. Our results provide a means of manipulating the competing AHE mechanisms in ferromagnetic alloys for fully understanding the AHE and also for technological applications of ferromagnetic alloys.