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Bloch Chirality Induced by an Interlayer Dzyaloshinskii-Moriya Interaction in Ferromagnetic Multilayers
Physical Review Letters ( IF 8.6 ) Pub Date : 2020-11-23 , DOI: 10.1103/physrevlett.125.227203
Shawn D. Pollard , Joseph A. Garlow , Kyoung-Whan Kim , Shaobo Cheng , Kaiming Cai , Yimei Zhu , Hyunsoo Yang

Chiral spin textures stabilized by the interfacial Dzyaloshinkii-Moriya interaction, such as skyrmions and homochiral domain walls, have been shown to exhibit qualities that make them attractive for their incorporation in a variety of spintronic devices. However, for thicker multilayer films, mixed textures occur in which an achiral Bloch component coexists with a chiral Néel component of the domain wall to reduce the demagnetization field at the film surface. We show that an interlayer Dzyaloshinkii-Moriya interaction can break the degeneracy between Bloch chiralities. We further find large population asymmetries and chiral branching in the Bloch component of the domain walls in well-ordered Co/Pd multilayers. This asymmetry is a result of the combined effect of the demagnetization field and an interlayer Dzyaloshinkii-Moriya interaction, and is strongly related to film thickness and structural ordering. This work paves the way toward the utilization of this effect toward controlling Bloch chirality in magnetic multilayers.

中文翻译:

铁磁多层中的层间Dzyaloshinskii-Moriya相互作用诱导的Bloch手性。

通过界面Dzyaloshinkii-Moriya相互作用(如天蝎子和同手性畴壁)而稳定的手性自旋织构已显示出可使其掺入多种自旋电子器件中的诱人品质。但是,对于较厚的多层膜,会出现混合纹理,其中非手性Bloch组分与畴壁的手性Néel组分共存,以减小膜表面的退磁场。我们表明,层间Dzyaloshinkii-Moriya相互作用可以打破Bloch手性之间的简并性。我们进一步发现结构域壁的Bloch分量中的总体种群不对称性和手性分支排列得井井有条。有限公司/多层。这种不对称性是退磁磁场和层间Dzyaloshinkii-Moriya相互作用共同作用的结果,并且与膜厚和结构有序性密切相关。这项工作为利用这种效应控制磁性多层中的Bloch手性铺平了道路。
更新日期:2020-11-23
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