Multiferroics with Spiral Spin Orders

Tokura, Y.; Seki, Shu

doi:10.1002/adma.200901961

Cited by 617 publications

(462 citation statements)

References 81 publications

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“…Such correlations are well understood as bulk phenomena 24 (Fig. 1a), but it gradually rotates towards the a axis when a magnetic field H || b is applied (Fig.…”

Section: Resultsmentioning

confidence: 99%

Polarization control at spin-driven ferroelectric domain walls

et al. 2015

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Unusual electronic states arise at ferroelectric domain walls due to the local symmetry reduction, strain gradients and electrostatics. This particularly applies to improper ferroelectrics, where the polarization is induced by a structural or magnetic order parameter. Because of the subordinate nature of the polarization, the rigid mechanical and electrostatic boundary conditions that constrain domain walls in proper ferroics are lifted. Here we show that spin-driven ferroelectricity promotes the emergence of charged domain walls. This provides new degrees of flexibility for controlling domain-wall charges in a deterministic and reversible process. We create and position a domain wall by an electric field in Mn 0.95 Co 0.05 WO 4 . With a magnetic field we then rotate the polarization and convert neutral into charged domain walls, while its magnetic properties peg the wall to its location. Using atomistic Landau-Lifshitz-Gilbert simulations we quantify the polarization changes across the two wall types and highlight their general occurrence.

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“…Such correlations are well understood as bulk phenomena 24 (Fig. 1a), but it gradually rotates towards the a axis when a magnetic field H || b is applied (Fig.…”

Section: Resultsmentioning

confidence: 99%

Polarization control at spin-driven ferroelectric domain walls

et al. 2015

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“…The electric polarization emerges upon the spiral-spin ordering [20,30,31], which reflects the strong coupling between non-collinear magnetic ordering and ferroelectricity in CuCrO 2 . Within the spin-current model or the inverse Dzyaloshinskii-Moriya (DM) mechanism [32][33][34], the electric polarization P ij produced between the canted spins S i and S j , located at sites i and j, respectively, is given by…”

Section: Introductionmentioning

confidence: 99%

Magnetoelectric properties of multiferroic CuCrO2 studied by means of ab initio calculations and Monte Carlo simulations

et al. 2017

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Motivated by the discovery of multiferroicity in the geometrically frustrated triangular antiferromagnet CuCrO2 below its Néel temperature TN , we investigate its magnetic and ferroelectric properties using ab initio calculations and Monte Carlo simulations. Exchange interactions up to the third nearest neighbors in the ab plane, inter-layer interaction and single ion anisotropy constants in CuCrO2 are estimated by series of density functional theory calculations. In particular, our results evidence a hard axis along the [110] direction due to the lattice distortion that takes place along this direction below TN . Our Monte Carlo simulations indicate that the system possesses a Néel temperature TN ≈ 27 K very close to the ones reported experimentally (TN = 24 − 26 K). Also we show that the ground state is a proper-screw magnetic configuration with an incommensurate propagation vector pointing along the [110] direction. Moreover, our work reports the emergence of spin helicity below TN which leads to ferroelectricity in the extended inverse Dzyaloshinskii-Moriya model. We confirm the electric control of spin helicity by simulating P -E hysteresis loops at various temperatures.

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“…Inherently strong ME effects have been found in the multiferroics whose ferroelectricity is induced by particular spin structures [4][5][6] . Among them, one unique mechanism for multiferroicity of spin origin is the spin-current model 7 or inverse DzyaloshinskiiMoriya interaction 8,9 ; the ferroelectric polarization (P) is induced by the spin supercurrent flowing between the mutually canted neighbouring spins (S i and S j ) under the presence of relativistic spin-orbit interaction and expressed as Ppe ij Â (S i Â S j ), where e ij denotes the unit vector connecting the neighbouring spin sites.…”

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confidence: 99%

Magnetochiral dichroism resonant with electromagnons in a helimagnet

et al. 2014

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Cross-coupling between magnetism and electricity in a solid can be hosted by multiferroics with both magnetic and ferroelectric orders. In multiferroics, the collective spin excitations active for both electric and magnetic fields, termed electromagnons, play a crucial role in the elementary process of magnetoelectric (ME) coupling. Here we report the colossal dynamical (optical) ME effect, or more specifically the magnetochiral (MCh) effect, in the electromagnon resonance for the screw spin helimagnet CuFe 1 À x Ga x O 2 (x ¼ 0.035). The MCh effect shows up as the nonreciprocal directional dichroism; the extinction coefficient is different for counter-propagating lights, as large as by 400%. The MCh effect derived from the screw spin order is proved by control of the magnetic helicity of helimagnetism and its magnetization. The results point to the general presence of the MCh effect in helimagnets, paving a way to the ME control of electromagnetic wave in the giga-to tera-hertz region.

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Multiferroics with Spiral Spin Orders

Cited by 617 publications

References 81 publications

Polarization control at spin-driven ferroelectric domain walls

Polarization control at spin-driven ferroelectric domain walls

Magnetoelectric properties of multiferroic CuCrO2 studied by means of ab initio calculations and Monte Carlo simulations

Magnetochiral dichroism resonant with electromagnons in a helimagnet

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