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arXiv 1811.02012cond-mat.mtrl-sci
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非对称[Pt/(Co/Ni)$_M$ /Ir] $_N$多层薄膜中手征自旋织构和Néel Skyrmions的Lorentz TEM研究

Lorentz TEM investigation of chiral spin textures and Néel Skyrmions in asymmetric [Pt/(Co/Ni)$_M$/Ir]$_N$ multi-layer thin films

Maxwell Li, Derek Lau, Marc De Graef, Vincent Sokalski

摘要:

利用菲涅耳模洛伦兹透射电子显微镜(LTEM)研究了对称[Co/Ni] $_M$和非对称[Pt/(Co/Ni)$_M$ /Ir] $_N$多层膜中的磁畴图案。在对称的多层,其中的Dzyaloshinskiii-Moriya相互作用预计为零,我们观察到纯粹的布洛赫型畴壁没有首选的手征。在非对称多层膜中,存在显著的界面缺陷,我们观察到具有手性Néel畴壁的畴图案,其随着垂直场的应用而演变成亚100 nm孤立的Néel Skyrmions。层的厚度和薄膜叠层的界面上的磁性的影响进行了讨论的背景下,开发一个可调的多层系统,为未来的自旋电子应用。

英文摘要:

We examine magnetic domain patterns in symmetric [Co/Ni]$_M$ and asymmetric [Pt/(Co/Ni)$_M$/Ir]$_N$ multi-layers using Fresnel mode Lorentz transmission electron microscopy (LTEM). In the symmetric multi-layer, where the Dzyaloshinskii-Moriya Interaction is expected to be zero, we observe purely Bloch type domain walls with no preferred chirality. In the asymmetric multi-layers, where significant interfacial DMI is present, we observe domain patterns with chiral Néel domain walls, which evolve into sub-100nm isolated Néel Skyrmions with the application of a perpendicular field. The impact of layer thickness and film stack on interfacial magnetic properties is discussed in the context of developing a tunable multi-layer system for future spintronic applications.

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