Establishing the fundamental magnetic interactions in the chiral skyrmionic Mott insulator Cu2OSeO3 by terahertz electron spin resonance

Abstract

The recent discovery of skyrmions in Cu${}_2$OSeO${}_3$ has established a new platform to create and manipulate skyrmionic spin textures. We use high-field electron spin resonance (ESR) spectroscopy combining a terahertz free electron laser and pulsed magnetic fields up to 64 T to probe and quantify its microscopic spin-spin interactions. Besides providing direct access to the long-wavelength Goldstone mode, this technique probes also the high-energy part of the excitation spectrum which is inaccessible by standard low-frequency ESR. Fitting the behavior of the observed modes in magnetic field to a theoretical framework establishes experimentally that the fundamental magnetic building blocks of this skyrmionic magnet are rigid, highly entangled and weakly coupled tetrahedra.

5 pages, 3 Figures

References in corpus (6)

• Spontaneous Skyrmion Ground States in Magnetic Metals
• Long wavelength helimagnetic order and skyrmion lattice phase in Cu2OSeO3
• Formation and rotation of skyrmion crystal in the chiral-lattice insulator Cu2OSeO3
• Strong Dzyaloshinskii-Moriya Interaction and Origin of Ferroelectricity in Cu2OSeO3
• Ferrimagnetism of the magnetoelectric compound Cu${}_2$OSeO${}_3$ probed by ${}^{77}$Se NMR
• Magnetoelectric effects in single crystals of the cubic ferrimagnetic helimagnet Cu2OSeO3

Cited by in corpus (8)

• The quantum origins of skyrmions and half-skyrmions in Cu2OSeO3
• Theory of magnetic skyrmion glass
• Ballistic magnon heat conduction and possible Poiseuille flow in the helimagnetic insulator Cu${}_2$OSeO${}_3$
• Megahertz dynamics in skyrmion systems probed with muon-spin relaxation
• Spin excitations in the skymion host Cu2OSeO3
• Site-specific electronic and magnetic excitations of the skyrmion material Cu${}_2$OSeO${}_3$
• Coherent two-dimensional THz magnetic resonance spectroscopies for molecular magnets: Analysis of Dzyaloshinskii-Moriya interaction
• Quintuplet condensation in the skyrmionic insulator Cu2OSeO3 at ultrahigh magnetic fields