The nature of Ho magnetism in multiferroic HoMnO3

三斜相 BiFeO3：一种具有增强磁性和电阻率的室温多铁相

Triclinic BiFeO3: A room-temperature multiferroic phase with enhanced magnetism and resistivity

研究结合实验、Monte Carlo 模拟与 DFT 计算，发现 BFO/LNMO 复合材料中的三斜相（P1）BFO 具有更高磁矩、磁电耦合和电阻率，是有前景的室温多铁相。

Rare earth magnetism and ferroelectricity in RMnO3

Magnetic rare earths R have been proven to have a significant effect on the multiferroic properties of the orthorhombic manganites RMnO3. A re-examination of previous results from synchrotron based x-ray scattering experiments suggests that symmetric exchange striction between neighboring R and Mn ions may account for the enhancement of the ferroelectric polarization in DyMnO3 as well as the magnetic-field induced ferroelectricity in GdMnO3. In general, adding a second magnetic species to a multiferroic material may be a route to enhance its ferroelectric properties.

Dynamically induced magnetism in KTaO$_3$

Dynamical multiferroicity features entangled dynamic orders: fluctuating electric dipoles induce magnetization. Hence, the material with paraelectric fluctuations can develop magnetic signatures if dynamically driven. We identify the paraelectric KTaO$_3$ (KTO) as a prime candidate for the observation of the dynamical multiferroicity. We show that when a KTO sample is exposed to a circularly polarized laser pulse, the dynamically induced ionic magnetic moments are of the order of 5\% of the nuclear magneton per unit cell. We determine the phonon spectrum using ab initio methods and identify T$…

Cr1/3NbS2中应变诱导的多铁性

Strain-induced multiferroicity in Cr1/3NbS2

本研究提出通过应变在非极性自旋螺旋材料中诱导极化以实现多铁性的新途径，利用磁电双折射技术与应变工程，证实了应变的Cr1/3NbS2在磁转变时出现极矢量，确立其为II型多铁性材料。

Spin-lattice coupling, frustration and magnetic order in multiferroic RMnO3

We have performed high resolution neutron diffraction and inelastic neutron scattering experiments in the frustrated multiferroic hexagonal compounds RMnO3 (R=Ho, Yb, Sc, Y), which provide evidence of a strong magneto-elastic coupling in the the whole family. We can correlate the atomic positions, the type of magnetic structure and the nature of the spin waves whatever the R ion and temperature. The key parameter is the position of the Mn ions in the unit cell with respect to a critical threshold of 1/3, which determines the sign of the coupling between Mn triangular planes.