Abstract
We report a detailed single-crystal investigation of a magnetoelectric ferrimagnet ${\mathrm{Cu}}_{2}{\mathrm{OSeO}}_{3}$ using dc magnetization and ac susceptibility along the three principal directions [100], [110], and [111]. We have observed that in small magnetic fields two magnetic transitions occur, one at ${T}_{c}=57$ K and the second one at ${T}_{N}=58$ K. At ${T}_{c}$ the nonlinear susceptibility reveals the emergence of the ferromagnetic component and below ${T}_{c}$ the magnetization measurements show the splitting between field-cooled and zero-field-cooled regimes. Above 1000 Oe the magnetization saturates and the system is in a single domain state. The temperature dependence of the saturation below ${T}_{c}$ can be well described by $\ensuremath{\mu}(T)=\ensuremath{\mu}(0){[1\ensuremath{-}{(T/{T}_{c})}^{2}]}^{\ensuremath{\beta}}$, with $\ensuremath{\mu}(0)=0.56{\ensuremath{\mu}}_{B}$/Cu, corresponding to the 3-up-1-down configuration. The dielectric constant measured on a thin single crystal shows a systematic deviation below the transition, indicating an intrinsic magnetoelectric effect.
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