title: Noncentrosymmetric Magnets Hosting Magnetic Skyrmions.
abstract: The concept of a skyrmion, which was first introduced by Tony Skyrme in the field of particle physics, has become widespread in condensed matter physics to describe various topological orders. Skyrmions in magnetic materials have recently received particular attention; they represent vortex-like spin structures with the character of nanometric particles and produce fascinating physical properties rooted in their topological nature. Here, a series of noncentrosymmetric ferromagnets hosting skyrmions is reviewed: B20 metals, Cu2OSeO3, Co-Zn-Mn alloys, and GaV4S8, where Dzyaloshinskii-Moriya interaction plays a key role in the stabilization of skyrmion spin texture. Their topological spin arrangements and consequent emergent electromagnetic fields give rise to striking features in transport and magnetoelectric properties in metals and insulators, such as the topological Hall effect, efficient electric-drive of skyrmions, and multiferroic behavior. Such electric controllability and nanometric particle natures highlight magnetic skyrmions as a potential information carrier for high-density magnetic storage devices with excellent energy efficiency.
authors.affiliation: Department of Applied Physics, University of Tokyo, Tokyo, 113-8656, Japan.
authors.forename: Naoya
authors.initials: N
authors.lastname: Kanazawa
authors.affiliation: RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan.
authors.forename: Shinichiro
authors.initials: S
authors.lastname: Seki
authors.affiliation: Department of Applied Physics, University of Tokyo, Tokyo, 113-8656, Japan.|RIKEN Center for Emergent Matter Science (CEMS), Wako, 351-0198, Japan.
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Tokura
keywords: Dzyaloshinskii-Moriya interaction; emergent electromagnetism; noncentrosymmetric ferromagnets; skyrmions; spintronics