从Bloch到Néel:FePd薄膜中依赖各向异性的畴壁特征
From Bloch to Néel: Anisotropy-dependent Domain-Wall Character in FePd Thin Films
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中文总结 AI 辅助
通过圆二色X射线共振磁散射等技术,实验研究了高垂直磁各向异性L1₀-FePd薄膜中畴壁的深度演化,发现磁晶各向异性强度影响畴壁从混合Bloch-Néel型向纯Néel型的转变,并揭示长程有序的关键作用。
中文摘要 AI 辅助
我们报告了对具有高垂直磁各向异性的L1$_0$-FePd薄膜中深度依赖的畴壁形成的实验研究。利用随入射X射线角度变化的圆二色X射线共振磁散射(CD-XRMS),我们探索了两个具有不同磁晶各向异性强度的样品中手性自旋纹理的深度演化。结合CD-STXM、CD-叠层成像以及结构有序、磁性质和表面形貌的宏观表征,我们将这些观察与FePd的L1$_0$相长程有序的差异联系起来。一个具有非常高磁晶各向异性($Q_{PMA}=1.8$)的FePd薄膜表现出意料之外的大Néel贡献。角度依赖的CD-XRMS直接揭示了从上层FePd层内的混合Bloch-Néel手性向下层FePd界面处纯Néel型结构的平滑转变。在第二个FePd样品中,尽管$Q_{PMA}=1.45$仍然相对较大,但发现畴壁为纯Néel型。这些结果表明长程结构有序在决定磁结构形成中起着关键作用。
英文摘要
We report an experimental investigation of the depth-dependent domain wall formation in L1$_0$-FePd thin films with high perpendicular magnetic anisotropy. Using circular dichroism X-ray resonant magnetic scattering (CD-XRMS) as a function of the incident X-ray angle, we explore the depth evolution of chiral spin textures in two samples with different strengths of magnetocrystalline anisotropy. Combined with CD-STXM, CD-ptychography, and macroscopic characterization of the structural order, magnetic properties, and surface morphology, we relate these observations to differences in the long-range order of the L1$_0$ phase of FePd. One FePd thin film with very high magnetocrystalline anisotropy, characterized by $Q_{PMA}=1.8$, exhibits an unexpectedly large Néel contribution. Angular-dependent CD-XRMS directly reveals a smooth transition from a hybrid Bloch-Néel chirality within the upper FePd layer towards a purely Néel-type structure at the lower FePd interface. In the second FePd sample, despite a still relatively large $Q_{PMA}=1.45$, the domain walls were found to be purely Néel type. These results indicate a crucial role of the long-range structural order in determining the formation of the magnetic structure.
发表机构
- European Spallation Source ERIC(欧洲散裂源)
- Division of Synchrotron Radiation Research, Lund University(隆德大学同步辐射研究部)
- Jülich Centre for Neutron Science (JCNS-2), Forschungszentrum Jülich GmbH(于利希中子科学中心(JCNS-2),于利希研究中心)
- Diamond Light Source(钻石光源)
- ALBA Synchrotron(阿尔巴同步辐射中心)
- MAX IV Laboratory, Lund University(隆德大学MAX IV实验室)
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