Magnetic structure and magnetoelectric coupling in bulk and thin filmFeVO4

Abstract

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

Spin fluctuations and frustrated magnetism in multiferroicFeVO4

“…To date, however, most studies of FeVO 4 have focused on this ferroelectricity, [8][9][10][11] and there has been only limited investigation of its magnetic states and their relation to frustration. The availability of FeVO 4 as high-quality single crystals makes it an excellent target material for NMR studies of its magnetic properties and of their coupling with ferroelectricity.…”

“…5,8 As for the microscopic mechanism responsible for this interaction, the strong coupling between the charge and spin sectors in FeVO 4 has been described as a magnetoelastically mediated magnetostriction 8 and as a magnetoelectric coupling 10 whose primary origin was proposed to lie in trilinear spin-phonon interactions. 11 In the magnetic sector, one of the most important terms leading to frustration and incommensurate ordered phases is the DzyaloshinskiiMoriya interaction, which arises from spin-orbit coupling in non-inversion-symmetric bonding geometries. These interactions are generic in systems of low crystal symmetry, exactly the situation encountered in FeVO 4 , where the triclinic structure has six Fe 3+ ions (three structurally inequivalent) in each unit cell.…”

“…FeVO 4 is a multiferroic compound that has been characterized mostly in polycrystalline [7][8][9] or thin-film form, 10,11 although single crystals have also been synthesized. 6 It crystallizes in a triclinic structure, with each unit cell containing 6 Fe 3+ , 6 V 5+ , and 24 O 2− ions, as shown in Fig.…”

Effect of transition metal doping on multiferroic ordering inFeVO4

“…In this work, we explore the effects of both non-magnetic (Zn) and magnetic (Cr and Mn) dopants on the multiferroic properties of FeVO 4 20 , which has significant magnetoelectric coupling 21,22 . FeVO 4 is a strongly frustrated system 23 21 , are suppressed to lower wave numbers with increasing Zn fraction (Fig 2 (a)).…”

Analysis of oxide and vanadate supports for catalytic hydrogen combustion: Kinetic and mechanistic investigations

“…However, wide and diffused peaks have been observed by several investigators for FeVO 4 . 45,46 The compound was found to be triclinic with a space group of P 1 . Ekambaram and Patil 47 have reported the synthesis of a series of vanadates by solution combustion synthesis and triclinic FeVO 4 was obtained in their study also.…”