Ferroelectric Polarization Reversal by a Magnetic Field in Multiferroic Y-type Hexaferrite Ba2Mg2Fe12O22

Taniguchi, Kouji; Abe, Nobuyuki; Ohtani, Shigemori; Umetsu, H.; Arima, T.

doi:10.1143/apex.1.031301

Cited by 102 publications

(84 citation statements)

References 14 publications

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“…Such a kind of magnetic-field induced ferroelectric transition was reported in some hexaferrites. [77][78][79][80] For another example, the electric polarization in (Eu,Y)-MnO 3 is rotated from along the a-axis to along the c-axis in a magnetic field along the a-axis, which stabilizes the spin helix on the bc plane. 81) This magnetic-field response is completely consistent with the prediction.…”

Section: Magnetic-field-induced Ferroelectric Phase Transitionmentioning

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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Section: Magnetic-field-induced Ferroelectric Phase Transitionmentioning

confidence: 99%

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

2011

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“…Multiferroic hexaferrites have been extensively investigated because they exhibit spindriven ferroelectricity associated with noncollinear magnetic orders in relatively low magnetic field and high temperature regions [1][2][3][4][5][6][7]. In fact, distinct magnetoelectric (ME) effects have been observed up to room temperature in a Z-type hexaferrite Sr 3 Co 2 Fe 24 O 41 [5] and a Ytype hexaferrite BaSrCo 2−x Zn x Fe 11 AlO 22 [7].…”

Section: Introductionmentioning

confidence: 99%

“…Ba 2 Mg 2 Fe 12 O 22 (BMFO) to be investigated here is another multiferroic Y-type hexaferrite [2,3,8,9]. Figure 1(a) shows the crystal structure of this system, which belongs to a rhombohedral space group of R3m.…”

Section: Introductionmentioning

confidence: 99%

Electromagnon excitation in the field-induced noncollinear ferrimagnetic phase ofBa2Mg2Fe12O22studied by polarized inelastic neutron scattering and terahertz time-domain optical spe

et al. 2016

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We have studied magnetic excitations in a field-induced noncollinear commensurate ferrimagnetic phase of Ba 2 Mg 2 Fe 12 O 22 by means of polarized inelastic neutron scattering (PINS) and terahertz (THz) time-domain optical spectroscopy under magnetic field. A previous THz spectroscopy study reported that the field-induced phase exhibits electric-dipole-active excitations with energies of around 5 meV [Kida et al., Phys. Rev. B 83, 064422 (2011)]. In the present PINS measurements, we observed inelastic scattering signals around 5 meV at the zone center in the spin-flip channel.This directly shows that the electric-dipole-active excitations are indeed of magnetic origin, that is, electromagnons. In addition, the present THz spectroscopy confirms that the excitations have oscillating electric polarization parallel to the c axis. In terms of the spin-current model (KatsuraNagaosa-Balatsky model), the noncollinear magnetic order in the field-induced phase can induce static electric polarization perpendicular to the c axis, but not dynamic electric polarization along the c axis. We suggest that the electromagnon excitations can be explained by applying the magnetostriction model to the out-of-phase oscillations of the magnetic moments, which is deduced from the present experimental results.

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“…In phase FE3, the polarization decays rapidly with increasing magnetic field and disappears above ~ 2 T. In high magnetic fields, the system with a high magnetization is believed to be in the collinear ferromagnetic phase which does not generate the ferroelectricity 16 . The magnetic structures of BaSrCoZnFe 11 AlO 22 in the three low-field phases are still unclear. According to recent studies in several Y-type hexaferrites, the application of moderate magnetic fields induces the transverse conical spin structures and yields a finite polarization [16][17][18] .…”

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Low magnetic field reversal of electric polarization in a Y-type hexaferrite

Fen

Zou

et al. 2012

Applied Physics Letters

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Magnetoelectric multiferroics in which ferroelectricity and magnetism coexist have attracted extensive attention because they provide great opportunities for the mutual control of electric polarization by magnetic fields and magnetization by electric fields. From a practical point view, the main challenge in this field is to find proper multiferroic materials with a high operating temperature and great magnetoelectric sensitivity. Here we report on the magnetically tunable ferroelectricity and the giant magnetoelectric sensitivity up to 250 K in a Y-type hexaferrite, BaSrCoZnFe 11 AlO 22 . Not only the magnitude but also the sign of electric polarization can be effectively controlled by applying low magnetic fields (a few hundreds of Oe) that modifies the spiral magnetic structures. The magnetically induced ferroelectricity is stabilized even in zero magnetic field. Decayless reproducible flipping of electric polarization by oscillating low magnetic fields is shown. The maximum linear magnetoelectric coefficient reaches a high value of ~ 3.0×10 3 ps/m at 200 K.In the past several years, spiral magnetic order induced multiferroics and magnetoelectric (ME) effects have been observed in a number of transition metal oxides such as TbMnO 3 , RMn 2 O 5 , CoCr 2 O 4 , and others [1][2][3] . In these spiral magnets, the magnetic order and ferroelectricity are inherently coupled and thus pronounced ME effects could be expected. 4,5 The microscopic mechanism has been well described with the spin current model 6 or the inverse Dzyaloshinskii-Moriya (DM) interaction model 7 . However, the ME effects in these spiral magnets are not useful for practical applications because they occur at low temperatures and require a large magnetic field of several tesla. Recently, the hexaferrites with helical spin order have been suggested as promising candidates for high temperature multiferroics. It was reported that some Y-type hexaferrites, such as (Ba,Sr) 2 Zn 2 Fe 12 O 22 and Ba 2 Mg 2 Fe 12 O 22 , can show magnetically induced ferroelectricity and pronounced ME effects due to modifications of spiral magnetic structures by applying magnetic fields [8][9][10][11] . Although the magnetic ordering temperatures of these Y-type hexaferrites are above room temperature, their ME effects are observable only below ~ 130 K. Subsequently, ME effects were also observed in Z-type 12,13 , M-type 14 , and U-type 15 hexaferrites.Especially, the low field ME effect in a Z-type hexaferrite, Sr 3 Co 2 Fe 24 O 41 , happens at room temperature, representing a big step towards practical applications 12. Nevertheless, there are still some critical problems to be overcome. For instance, although magnetic control of electric polarization at room temperature has been achieved, the reversal of electric polarization by magnetic fields has been realized only at low temperatures 10,11,14 . We prepared the Y-type hexaferrites by solid state reaction in oxygen. The as-sintered samples are not insulating enough at high temperatures, and thus a post-annealing...

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Ferroelectric Polarization Reversal by a Magnetic Field in Multiferroic Y-type Hexaferrite Ba₂Mg₂Fe₁₂O₂₂

Cited by 102 publications

References 14 publications

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

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

Electromagnon excitation in the field-induced noncollinear ferrimagnetic phase ofBa2Mg2Fe12O22studied by polarized inelastic neutron scattering and terahertz time-domain optical spe

Low magnetic field reversal of electric polarization in a Y-type hexaferrite

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