Magnetic skyrmions and bimerons in films with anisotropic interfacial Dzyaloshinskii-Moriya interaction

We consider localized topologically nontrivial magnetic textures (skyrmions, antiskyrmions, and bimerons) in a thin magnetic film with anisotropic interfacial Dzyaloshinskii-Moriya interaction (iDMI). We use micromagnetic simulations and analytical consideration for studying the internal magnetic structure and stability of these textures. Skyrmion and antiskyrmion become elliptic and orient along the main axes of the iDMI tensor even for small anisotropy. In contrast, bimeron (antibimeron) orientation changes fluently with varying the iDMI anisotropy. Depending on the iDMI anisotropy the bimeron may consist of a vortex and antivortex pair or of hedgehog state and antivortex. In experiment the considered iDMI anisotropy can be induced by a strain applied to a magnetic film. We develop a phenomenological approach to establish the strain-iDMI relation.

Automated summary

The article discusses topologically nontrivial magnetic textures (skyrmions, antiskyrmions, and bimerons) in a thin magnetic film with anisotropic interfacial Dzyaloshinskii-Moriya interaction (iDMI), analyzing their internal magnetic structure and stability through micromagnetic simulations and analytical considerations. The orientations of skyrmions, antiskyrmions, and bimerons respond differently to variations in the iDMI anisotropy, with bimerons potentially consisting of various magnetic configurations depending on the strength of the anisotropy. This iDMI anisotropy, induced experimentally through strain on the magnetic film, is studied with a phenomenological approach to establish the strain-iDMI relation.