Antiferromagnetic spin cantings as a driving force of ferroelectricity in multiferroic Cu2OSeO3
arXiv:1608.03152 · doi:10.1088/1361-648X/aa61e7
Abstract
Ferroelectric properties of cubic chiral magnet Cu2OSeO3 can emerge due to the spin noncollinearity induced by antiferromagnetic cantings. These cantings are the result of the Dzyaloshinskii-Moriya interaction and in many ways similar to the ferromagnetic cantings in weak ferromagnets. An expression for the local electric polarization is derived, including terms with gradients of magnetization M(r). When averaged over the crystal the electric polarization has a non-vanishing part associated with the anisotropy of the crystal point group 23. In the framework of the microscopic theory, it is shown that both scalar and vector products of spins, (s1 . s2) and [s1 x s2], can give contributions of the same order in the electric polarization.
References in corpus (28)
- Skyrmion Lattice in a Chiral Magnet
- Spin current and magneto-electric effect in non-collinear magnets
- Spontaneous Skyrmion Ground States in Magnetic Metals
- Ferroelectricity in spiral magnets
- Skyrmion Lattice in a Doped Semiconductor
- Long wavelength helimagnetic order and skyrmion lattice phase in Cu2OSeO3
- Observation of magnetic excitations of skyrmion crystal in a helimagnetic insulator
- Spin-polarization coupling in multiferroic transition-metal oxides
- Ferroelectricity induced by acentric spin-density waves in YMnO
- Formation and rotation of skyrmion crystal in the chiral-lattice insulator Cu2OSeO3
- Magnetoelectric nature of skyrmions in a chiral magnetic insulator Cu2OSeO3
- Anisotropic Spin Hamiltonians due to Spin-Orbit and Coulomb Exchange Interactions
- Magnetoelectric coupling in the cubic ferrimagnet Cu2OSeO3
- Electric-field control of the skyrmion lattice in Cu2OSeO3
- Long-range crystalline nature of the skyrmion lattice in MnSi
- Strong Dzyaloshinskii-Moriya Interaction and Origin of Ferroelectricity in Cu2OSeO3
- The quantum origins of skyrmions and half-skyrmions in Cu2OSeO3
- A Neutron diffraction study of multiferroics RMn2O5
- Dynamical magnetoelectric phenomena of multiferroic skyrmions
- Magnetoelectric effects in the skyrmion host material Cu2OSeO3
- Magnetoelectric effects in single crystals of the cubic ferrimagnetic helimagnet Cu2OSeO3
- Weak antiferromagnetic ordering and pure magnetic reflections induced by Dzyaloshinskii-Moriya interaction in MnSi-type crystals
- Frustrated magnetic helices in MnSi-type crystals
- Multi-shell contribution to the Dzyaloshinskii-Moriya spiralling in MnSi-type crystals
- Origin and consequence of an unpinned helical magnet: application to partial order in MnSi under pressure
- Melting of hexagonal Skyrmion states in chiral magnets
- Microscopic description of twisted magnetic Cu2OSeO3
- Determination of the zero-field magnetic structure of the helimagnet MnSi at low temperature