Non-circular skyrmion and its anisotropic response in thin films of chiral magnets under tilted magnetic field

TL;DR

This paper investigates how tilted magnetic fields affect the shape, interactions, and arrangements of skyrmions in thin chiral magnet films, revealing non-circular skyrmions with anisotropic responses.

Contribution

It introduces the concept of non-circular skyrmions under tilted fields and describes their anisotropic interactions and lattice distortions, advancing understanding of skyrmion behavior in tilted magnetic environments.

Findings

Skyrmions become non-circular with decreased density at higher tilt angles.

Lattice structures distort from triangular to rectangular under tilted fields.

Skyrmion dynamics depend on the direction of applied currents.

Abstract

We study the equilibrium and dynamical properties of skyrmions in thin films of chiral magnets with oblique magnetic field. The shape of an individual skyrmion is non-circular and the skyrmion density decreases with the tilt angle from the normal of films. As a result, the interaction between two skyrmions depends on the relative angle between them in addition to their separation. The triangular lattice of skyrmions under a perpendicular magnetic field is distorted into a centered rectangular lattice for a tilted magnetic field. For a low skyrmion density, skyrmions form a chain like structure. The dynamical response of the non-circular skyrmions depends on the direction of external currents.