Chiral solitons in monoaxial chiral magnets in tilted magnetic field

TL;DR

This paper investigates how tilting magnetic fields affects the stability and interactions of chiral solitons in monoaxial chiral magnets, revealing phase transitions and surface instabilities, supported by experimental magnetoresistance measurements.

Contribution

It provides a theoretical and experimental analysis of how tilted magnetic fields influence chiral solitons, including their stability, interactions, and associated phase transitions.

Findings

Tilted magnetic fields alter soliton stability and interactions.

Discontinuous phase transition caused by soliton condensation.

Hysteresis in magnetoresistance indicates soliton presence.

Abstract

We show that the stability (existence/absence) and interaction (repulsion/attraction) of chiral solitons in monoaxial chiral magnets can be varied by tilting the direction of magnetic field. We, thereby, elucidate that the condensation of attractive chiral solitons causes the discontinuous phase transition predicted by a mean field calculation. Furthermore we theoretically demonstrate that the metastable field-polarized-state destabilizes through the surface instability, which is equivalent to the vanishing surface barrier for penetration of the solitons. We experimentally measure the magnetoresistance (MR) of micrometer-sized samples in the tilted fields in demagnetization-free configuration. We corroborate the scenario that hysteresis in MR is a sign for existence of the solitons, through agreement between our theory and experiments.