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The magnetic and dielectric properties of \aa kermanite Sr$_2$CoSi$_2$O$_7$single crystals in high magnetic fields were investigated. We have observedfinite induced electric polarization along the c axis in high fields, whereinall Co spins were forcibly aligned to the magnetic field direction. Existenceof the induced polarization in the spin-polarized state accompanied with thefinite slope in the magnetization curve suggests the possible role of theorbital angular momenta in the excited states as its microscopic origin. Theemergence of the field-induced polarization without particular magnetic ordercan be regarded as the magnetoelectric effects of the second order from thesymmetry point of view. A low magnetic field-driven electric polarization flipinduced by a rotating field, even at room temperature, has been successfullydemonstrated.

Multiferroic properties of an \aa kermanite Sr$_2$CoSi$_2$O$_7$ single crystal in high magnetic fields