Coupled quasimonopoles in chiral magnets

Abstract

It is shown that in isotropic crystals of a chiral magnet, the dipole strings (DSs), representing coupled magnetic singularities (Bloch points) of the opposite sign, can emerge as stable states in geometrically confined samples as well as in the interior of bulk crystals. Here, the authors also report an intriguing effect of spontaneous nucleation of DSs at elevated temperatures near the paramagnetic phase transition, which may shed light on the nature of the $A$ phase (anomalous phase) observed in bulk crystals of $B$20-type chiral magnets.

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