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Tackett, Ronald; Lawes, G.; Melot, Brent C.; Grossman, Madeleine; Toberer, Eric S.; Seshadri, Ram

doi:10.1103/physrevb.76.024409

Cited by 161 publications

(145 citation statements)

References 38 publications

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“…8,24 Similar effect is observed in Mn 3 O 4 , in which opposite MDC effects happen above and below magnetic transition temperature. 25 Hence, spin-phonon interaction is supposed to be responsible for the MDC at high frequency range.…”

Section: -3mentioning

confidence: 99%

Temperature and frequency dependent giant magnetodielectric coupling in DyMn0.33Fe0.67O3

Hong

Cheng

Wang

2012

Journal of Applied Physics

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Perovskite DyMn0.33Fe0.67O3 experiences a paramagnetism-antiferromagnetism transition at 450K and spin reorientation at 290 K. Magnetodielectric properties were studied around the spin reorientation transition. Both giant positive and giant negative magnetodielectric coupling (MDC) were observed near room temperature. The MDC shows strong temperature and frequency dependence, and the sign changes from positive to negative when magnetic state transits from a canted antiferromagnetic state to a collinear antiferromagnetic state. Possible mechanisms are proposed based on the Maxwell-Wagner model, phase transition, the magnetoresistance effect, and spin-phonon coupling.

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Section: -3mentioning

confidence: 99%

Temperature and frequency dependent giant magnetodielectric coupling in DyMn0.33Fe0.67O3

Hong

Cheng

Wang

2012

Journal of Applied Physics

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“…This spinel phase undergoes a structural phase transition at 15 GPa into the CaMn 2 O 4 -type phase, referred to as post-spinel (Figure 1), which is quenchable to ambient pressure 4,5 . The magnetic properties of Mn 3 O 4 spinel have been extensively studied, with three magnetic transitions and a pronounced magnetodielectric coupling being reported 6,7 . On the other hand, studies of Mn 3 O 4 post-spinel are limited to structural work using X-ray diffraction (XRD) 4,8 and Raman spectroscopy 9 .…”

Section: Introductionmentioning

confidence: 99%

Giant atomic displacement at a magnetic phase transition in metastable Mn3O4

et al. 2013

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We present x-ray, neutron scattering and heat capacity data that reveal a coupled first-order magnetic and structural phase transition of the metastable mixed-valence post-spinel compound Mn3O4 at 210 K. Powder neutron diffraction measurements reveal a magnetic structure in which Mn 3+ spins align antiferromagnetically along the edge-sharing a-axis, with a magnetic propagation vector k = [1/2, 0, 0]. In contrast, the Mn 2+ spins, which are geometrically frustrated, do not order until a much lower temperature. Although the Mn 2+ spins do not directly participate in the magnetic phase transition at 210 K, structural refinements reveal a large atomic shift at this phase transition, corresponding to a physical motion of approximately 0.25Å even though the crystal symmetry remains unchanged. This "giant" response is due to the coupled effect of built-in strain in the metastable post-spinel structure with the orbital realignment of the Mn 3+ ion.

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“…4 Despite this apparent restriction, a rather large number of single-phase systems have been identified as magnetoelectric multiferroics. [5][6][7] A number of microscopic mechanisms have been proposed for the development of multiferroic order, including, a magnetic Jahn-Teller distortion 8 for TbMn 2 O 5 , 9 bond and site ordering having distinct centers of inversion symmetry, 10 a microscopic mechanism leading to a spincurrent interaction, 11 the Dzyloshinskii-Moriya interaction, 12 a general anisotropic exchange striction, 13 a spin-phonon interaction, 14 and a strain-induced ferroelectricity. 15 Phenomenologically, magnetically induced ferroelectric order developing in systems having multiple magnetic phases can be understood by considering a trilinear term in the magnetoelectric free energy, F ME , coupling the electric polarization with two distinct order parameters 1 and 2 which together break inversion symmetry so that F ME ϰ P 1 2 .…”

Section: Introductionmentioning

confidence: 99%

“…26 Because this magnetodielectric coupling is also expected to depend strongly on the symmetry of the magnetic phase, it has been suggested that changes in this coupling may be used to probe changes in the ordered spin structure. 14 Triclinic iron vanadate, FeVO 4 , has recently been identified as a multiferroic system having the P1 space group. [27][28][29] Magnetic, thermodynamic, and neutron-diffraction studies on FeVO 4 single crystal and ceramic samples have shown that FeVO 4 transitions from a paramagnetic phase into a collinear incommensurate ͑CI͒ phase at T N1 = 22 K and then into noncollinear incommensurate ͑NCI͒ phase at T N2 =15 K. [27][28][29][30] Ferroelectric order in FeVO 4 develops in this noncollinear spiral magnetic phase.…”

Section: Introductionmentioning

confidence: 99%

Magnetic structure and magnetoelectric coupling in bulk and thin filmFeVO4

2010

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We have investigated the magnetoelectric and magnetodielectric response in FeVO 4 , which exhibits a change in magnetic structure coincident with ferroelectric ordering at T N2 ≈15 K. Using symmetry considerations, we construct a model for the possible magnetoelectric coupling in this system and present a discussion of the allowed spin structures in FeVO 4 . Based on this model, in which the spontaneous polarization is caused by a trilinear spin-phonon interaction, we experimentally explore the magnetoelectric coupling in FeVO 4 thin films through measurements of the electric field-induced shift of the multiferroic phase transition temperature, which exhibits an increase of 0.25 K in an applied field of 4 MV/m. The strong spin-charge coupling in FeVO 4 is also reflected in the significant magnetodielectric shift, which is present in the paramagnetic phase due to a quartic spin-phonon interaction and shows a marked enhancement with the onset of magnetic order which we attribute to the trilinear spin-phonon interaction. We observe a clear magnetic field-induced dielectric anomaly at lower temperatures, distinct from the sharp peak associated with the multiferroic transition, which we tentatively assign to a spin-reorientation crossover. We also present a magnetoelectric phase diagram for FeVO 4 . We have investigated the magnetoelectric and magnetodielectric response in FeVO 4 , which exhibits a change in magnetic structure coincident with ferroelectric ordering at T N2 Ϸ 15 K. Using symmetry considerations, we construct a model for the possible magnetoelectric coupling in this system and present a discussion of the allowed spin structures in FeVO 4 . Based on this model, in which the spontaneous polarization is caused by a trilinear spin-phonon interaction, we experimentally explore the magnetoelectric coupling in FeVO 4 thin films through measurements of the electric field-induced shift of the multiferroic phase transition temperature, which exhibits an increase of 0.25 K in an applied field of 4 MV/m. The strong spin-charge coupling in FeVO 4 is also reflected in the significant magnetodielectric shift, which is present in the paramagnetic phase due to a quartic spin-phonon interaction and shows a marked enhancement with the onset of magnetic order which we attribute to the trilinear spin-phonon interaction. We observe a clear magnetic field-induced dielectric anomaly at lower temperatures, distinct from the sharp peak associated with the multiferroic transition, which we tentatively assign to a spin-reorientation crossover. We also present a magnetoelectric phase diagram for FeVO 4 . Disciplines Physics | Quantum Physics

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Magnetodielectric coupling inMn3O4

Cited by 161 publications

References 38 publications

Temperature and frequency dependent giant magnetodielectric coupling in DyMn0.33Fe0.67O3

Temperature and frequency dependent giant magnetodielectric coupling in DyMn0.33Fe0.67O3

Giant atomic displacement at a magnetic phase transition in metastable Mn3O4

Magnetic structure and magnetoelectric coupling in bulk and thin filmFeVO4

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