Magnetoelectric effects in the skyrmion host material Cu2OSeO3
E. Ruff, P. Lunkenheimer, A. Loidl, H. Berger, S. Krohns
TL;DR
This study thoroughly investigates the magnetoelectric coupling, polarization, and dielectric properties of Cu2OSeO3, revealing detailed phase behavior and examining potential multiferroic characteristics in its skyrmion phase.
Contribution
It provides a comprehensive experimental analysis of magnetoelectric effects and phase diagram in Cu2OSeO3, highlighting the properties of its skyrmion and magnetic phases.
Findings
Detailed phase diagram of Cu2OSeO3 under magnetic fields
Characterization of skyrmion and metamagnetic transition
No evidence of switchable polar order by electric field
Abstract
Insulating helimagnetic Cu2OSeO3 shows sizeable magnetoelectric effects in its skyrmion phase. Using magnetization measurements, magneto-current analysis and dielectric spectroscopy, we provide a thorough investigation of magnetoelectric coupling, polarization and dielectric constants of the ordered magnetic and polar phases of single-crystalline Cu2OSeO3 in external magnetic fields up to 150 mT and at temperatures below 60 K. From these measurements we construct a detailed phase diagram. Especially, the skyrmion phase and the metamagnetic transition of helical to conical spin order are characterized in detail. Finally we address the question if there is any signature of polar order that can be switched by an external electric field, which would imply multiferroic behaviour of Cu2OSeO3.
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