A long-standing issue in multiferroic MnWO 4 is the electric polarization reversal when
magnetic field is applied along the magnetic easy axis (H|| u). In this work, we performed …

The low-dimensional frustrated antiferromagnet system has been an appealing playground
for investigating the exotic magnetic ground states. The S= 1/2 skew chain Co 2 V 2 O 7 …

We report successive electric-polarization (P) switches in the S= 1/2 quantum magnet Co 2
V 2 O 7 by application of a magnetic field along the b axis, where a 1/2-magnetization …

We present the magnetic phase diagram of the multiferroic geometrically frustrated
antiferromagnet CuCrO 2 determined using dielectric constant and ultrasonic velocity …

We present a detailed analysis of the magnetic states of monoclinic multiferroic systems as a
function of temperature and magnetic field. The proposed nonlocal Landau free energy …

Motivated by the complex phase diagram of MnWO 4, we investigate the competition
between anisotropy, magnetic field, and helicity for the anisotropic next-nearest-neighbor …

We discuss theoretically phase transitions in frustrated antiferromagnets with biaxial
anisotropy or dipolar forces in magnetic field applied along the easy axis at T= 0. There are …

The magnetic and ferroelectric properties of the multiferroic system Mn 1− x Co x WO 4 (x=
0.135, 0.15, and 0.17) are studied in magnetic fields H c oriented along the monoclinic c …

Slightly Co-doped MnWO 4 at the lowest 5% Co concentration, for which the multiferroic
cycloidal phase becomes a ground state, has been studied in magnetic fields up to 60 T by …

By applying Berry-phase theory for the effective half-filled Hubbard model, we derive an
analytical expression for the electronic polarization driven by the relativistic spin-orbit (SO) …