Periodic rotation of magnetization in a non-centrosymmetric soft magnet induced by an electric field

Saito, Mitsuhiro; Ishikawa, Kenta; Konno, S.; Taniguchi, Kouji; Arima, T.

doi:10.1038/nmat2492

Cited by 63 publications

(38 citation statements)

References 29 publications

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“…This is contrastive with the previous results of the electric-field control of magnetization for the canted antiferromagnet (Cu,Ni)B 2 O 4 with a similar noncentrosymmetric crystal structure [24], where the electric field can switch the tilting angle of the much smaller magnetization (∼ 6 × 10 −3 µ B /Cu 2+ ) up to ±30…”

Section: (G)contrasting

confidence: 99%

Ferroelectricity Induced by Spin-Dependent Metal-Ligand Hybridization inBa2CoGe2O7

et al. 2010

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We have investigated the variation of induced ferroelectric polarization under magnetic field with various directions and magnitudes in a staggered antiferromagnet Ba2CoGe2O7. While the ferroelectric polarization cannot be explained by the well-accepted spin current model nor exchange striction mechanism, we have shown that it is induced by the spin-dependent p-d hybridization between the transition-metal (Co) and ligand (O) via the spin-orbit interaction. On the basis of the correspondence between the direction of electric polarization and the magnetic state, we have also demonstrated the electrical control of the magnetization direction.Electrical control of magnetism has long been an important subject in condensed-matter physics as well as an urgent issue in contemporary spin-electronics. One of the promising ways toward this goal is to make use of magnetoelectric effect (change of magnetization by electric field, or reciprocally, change of electric polarization by magnetic field) in magnetic dielectrics [1][2][3][4][5]. The electric-field control of magnetism in terms of the magnetoelectric effect is much less dissipative in energy than the current control of magnetism in itinerant ferromagnets. While the magnetoelectric effect was thought to be quite small, the magnetically-induced ferroelectrics (multiferroics) and their giant magnetoelectric effect have recently been discovered and are now attracting much attention.There are several microscopic mechanisms for the magnetically-induced ferroelectricity. The most prevailing mechanism is the spin current mechanism[6], or equivalently the inverse Dzyaloshinskii-Moriya mechanism [7,8]. In the transverse-helical (cycloidal) spin structure, the spin chirality can induce the polarization P ∝ i,j e ij × (S i × S i ) in terms of the spin current mechanism, where e ij denotes the unit vector connecting the interacting neighbor spins S i and S j . In the crystal which contains multiple inequivalent magnetic sites, even the collinear spin structure may also induce ferroelectricity with use of magnetostriction caused by the symmetric exchange interaction [15]. In these materials, the ferroelectricity can be caused by the transition metal-ligand (p-d) hybridization depending on the spin direction [16,17]. Owing to the hybridization relevant to the spin-orbit interaction, the ionic charge ρ of the ligand can vary depending on the angle η between the spin of the transition metal and the vector e connecting the transition metal and the ligand, i.e. ∆ρ ∝ (S · e) 2 . Therefore, the local electric polarization ∆P ∝ (S · e) 2 e exists between the transition metal and the ligand. The induced charge of the local dipoles, when summed up over the whole crystal, may induce the ferroelectricity. To examine the mechanism in more detail, a more simple spin structure is desirable because this is a single ion problem rather than a spin correlation (S i × S j , S i · S j , etc.) one. In this paper, we show the ferroelectricity and its magnetic-field dependence in a simple staggered antif...

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Section: (G)contrasting

confidence: 99%

Ferroelectricity Induced by Spin-Dependent Metal-Ligand Hybridization inBa2CoGe2O7

et al. 2010

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“…Another good example is an electric-field-induced magnetization rotation in Ni-doped copper metaborite. 89) CuB 2 O 4 is an insulator with D 2d symmetry, as shown in Fig. 17(a), which undergoes successive magnetic transitions.…”

Section: Electrical Control Of Magnetic Domainmentioning

confidence: 99%

Spin-Driven Ferroelectricity and Magneto-Electric Effects in Frustrated Magnetic Systems

2011

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The interplay between magnetism and electricity in matter has become a central issue of condensed-matter physics. This review focuses on the ferroelectricity induced by magnetic order mostly in frustrated magnets, which is nowadays referred to as magneto-electric (ME) multiferroic, or often only as multiferroic. Some distinct types of microscopic origins relevant to the spin-driven ferroelectricity are discussed in detail. Then one sees that the frustration-based spindriven ferroelectrics can exhibit nonlinear and giant ME responses of phase-transition type and of domain-control type, in contrast to the conventional magnetoelectrics hosting linear ME effects.

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“…The optical ME effect of the magnon modes in multiferroics, which gives rise to the unidirectional transmission in the gigahertz-terahertz frequency range, has recently become a hot topic in materials science [15][16][17][18][19][20][21][22][23][24]. The difference in the absorption coefficients (α) of beams counterpropagating in such ME media-called the nonreciprocal directional dichroism (NDD)-can be expressed for linear light polarization as [15,16] …”

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confidence: 99%

Optical Diode Effect at Spin-Wave Excitations of the Room-Temperature MultiferroicBiFeO3

Kézsmárki¹,

Nagel²,

Bordács³

et al. 2015

Phys. Rev. Lett.

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Multiferroics permit the magnetic control of the electric polarization and the electric control of the magnetization. These static magnetoelectric (ME) effects are of enormous interest: The ability to read and write a magnetic state current-free by an electric voltage would provide a huge technological advantage. Dynamic or optical ME effects are equally interesting, because they give rise to unidirectional light propagation as recently observed in low-temperature multiferroics. This phenomenon, if realized at room temperature, would allow the development of optical diodes which transmit unpolarized light in one, but not in the opposite, direction. Here, we report strong unidirectional transmission in the room-temperature multiferroic BiFeO 3 over the gigahertz-terahertz frequency range. The supporting theory attributes the observed unidirectional transmission to the spin-current-driven dynamic ME effect. These findings are an important step toward the realization of optical diodes, supplemented by the ability to switch the transmission direction with a magnetic or electric field. DOI: 10.1103/PhysRevLett.115.127203 PACS numbers: 75.85.+t, 75.50.-y, 76.50.+g BiFeO 3 is by far the most studied compound in the populous family of multiferroic and magnetoelectric (ME) materials [1][2][3][4][5][6][7][8][9]. While experimental studies have already reported about the first realizations of the ME memory function using BiFeO 3 -based devices [6][7][8][9], the origin of the ME effect is still under debate due to the complexity of the material. Because of the low symmetry of iron sites and iron-iron bonds, the magnetic ordering can induce local polarization via each of the three canonical terms [10]-the spin-current, exchange-striction, and single-ion mechanisms. While the spin-current term has been identified as the leading contribution to the magnetically induced ferroelectric polarization in various studies [5,11,12], the spin-driven atomic displacements [13] and the electrically induced shift of the spin-wave (magnon) resonances [14] were interpreted based on the exchange-striction and single-ion mechanisms, respectively.In the magnetically ordered phase below T N ¼ 640 K, BiFeO 3 possesses an exceptionally large spin-driven polarization [13], if not the largest among all known multiferroic materials. Nevertheless, its systematic study has long been hindered by the huge lattice ferroelectric polarization (P 0 ) developing along one of the cubic h111i directions at T C ¼ 1100 K and by the lack of single-domain ferroelectric crystals. Owing to the coupling between P 0 and the spindriven polarization, in zero magnetic field they both point along the same [111] axis. A recent systematic study of the static ME effect revealed additional spin-driven polarization orthogonal to the [111] axis [12].The optical ME effect of the magnon modes in multiferroics, which gives rise to the unidirectional transmission in the gigahertz-terahertz frequency range, has recently become a hot topic in materials science [15][16][17][18][19]...

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Periodic rotation of magnetization in a non-centrosymmetric soft magnet induced by an electric field

Cited by 63 publications

References 29 publications

Ferroelectricity Induced by Spin-Dependent Metal-Ligand Hybridization inBa2CoGe2O7

Ferroelectricity Induced by Spin-Dependent Metal-Ligand Hybridization inBa2CoGe2O7

Spin-Driven Ferroelectricity and Magneto-Electric Effects in Frustrated Magnetic Systems

Optical Diode Effect at Spin-Wave Excitations of the Room-Temperature MultiferroicBiFeO3

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