Lattice dynamics and spontaneous magnetodielectric effect in ilmenite CoTiO3

Dubrovin, R. M.; Siverin, N. V.; Prosnikov, M. A.; Chernyshev, V. A.; Новикова, Н. Н.; Christianen, P.C.M.; Balbashov, A. M.; Pisarev, R. V.

doi:10.1016/j.jallcom.2020.157633

Cited by 19 publications

(16 citation statements)

References 65 publications

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“…The CoTiO 3 magnetic configuration is reported as "Gtype" antiferromagnetic ordering below the Néel temperature of 38 K [5][6][7][8]17]. This configuration consists of ferromagnetically coupled hexagonal ab-planes, antiferromagnetically coupled in the c-axis, as shown in Fig.…”

Section: B Chemical and Magnetic Structuresmentioning

confidence: 93%

“…These values have not to be confused with the ones in Refs. [5,6], which are calculated for a different model Hamiltonian.…”

Section: Spin Configurationmentioning

confidence: 99%

“…In particular, cobalt titanate, CoTiO 3 , has a broad variety of electronic based industrial applications including catalysis [2], as a highκ dielectric [3] (where κ is the dielectric constant), and as a gas sensor [4]. In addition, CoTiO 3 has been reported to exhibit Dirac magnons [5] and a magnetodielectric effect [6]. Despite the growing interest in the electronic and magnetic properties of cobalt titanate, to the best of our knowledge, first principle theoretical studies of its magnetic properties are absent from the literature.…”

Section: Introductionmentioning

confidence: 99%

“…Neutron scattering averages over the domains and allows one to recover the C 3v symmetry found in magnetic excitations. Using first principles calculations, the phonon vibrational properties were studied to explain Raman observations [6]. Therefore, to comple-ment these non-magnetic results, and clarify the validity of the assumptions made to explain neutron scattering data, there is a need to study the magnetic properties of CoTiO 3 ilmenites in a single perfect crystal.…”

Section: Introductionmentioning

confidence: 99%

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Out-of-plane magnetic anisotropy in bulk ilmenite $\text{CoTiO}_3$

Arruabarrena,

Leonardo,

Rodriguez-Vega

et al. 2021

Preprint

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Structural, electronic and magnetic properties of bulk ilmenite CoTiO3 are analyzed in the framework of Density Functional Theory (DFT), using the Generalized Gradient Approximation (GGA) and Hubbard-corrected approaches. We find that the G-type antiferromagnetic (G-AFM) structure, which consists of antiferromagnetically coupled ferromagnetic ab planes, is the ground-state of the system, in agreement with experiments. Furthermore, cobalt titanates present two critical temperatures related to the breaking of the inter-and intra-layer magnetic ordering. This would result in the individual planes remaining ferromagnetic even at temperatures above the Néel temperature. When spin-orbit coupling is included in our calculations, we find an out-of-plane magnetic anisotropy, which can be converted to an in-plane anisotropy with a small doping of electrons corresponding to about 2.5% Ti substitution for Co, consistent with experimental expectations. We thus present a disorder-dependent study of the magnetic anisotropy in bulk CoTiO3, which will determine its magnon properties, including topological aspects.

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Section: B Chemical and Magnetic Structuresmentioning

confidence: 93%

“…These values have not to be confused with the ones in Refs. [5,6], which are calculated for a different model Hamiltonian.…”

Section: Spin Configurationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Out-of-plane magnetic anisotropy in bulk ilmenite $\text{CoTiO}_3$

Arruabarrena,

Leonardo,

Rodriguez-Vega

et al. 2021

Preprint

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“…In this report, we investigate CoTiO 3 belonging to the ilmenites titanates family (M TiO 3 ; M = Co, Ni, Mn, Fe), which have been studied quite extensively in the recent years due their significant magnetoelectric and magnetoelastic properties [11][12][13][14][15][16]. All the ilmenite titanates crystallize in the rhombohedral R 3 structure with the magnetic M 2+ ions in the basal ab plane arranged in a buckled honeycomb-like structure (see Fig.…”

Section: Introductionmentioning

confidence: 99%

Magnetostriction and magnetostructural domains in CoTiO$_3$

Dey,

Hoffmann,

Klingeler

2021

Preprint

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We report the magnetostrictive length changes of CoTiO3 studied by means of high-resolution dilatometry in magnetic fields (B) up to 15 T. In the long-range antiferromagnetically ordered phase below TN = 38 K, the easy-plane type spin structure undergoes a spin-reorientation transition in the ab plane in magnetic fields B||ab ≈ 2 T. We observe pronounced length changes driven by external magnetic field in this field region indicating significant magnetoelastic coupling in CoTiO3. Specifically, we observe anisotropic deformation of the lattice for fields applied in the ab plane. While, for B 2 T, in-plane magnetostriction shows that the lattice expands (contracts) parallel (perpendicular) to the field direction, the opposite behaviour appear at higher fields. Furthermore, there are remarkable effects of slight changes in the applied uniaxial pressure on the magnetostrictive response of CoTiO3 persisting to temperatures well above TN. The data evidence the presence of magnetic domains below TN as well as of structural ones in CoTiO3. The presence of magnetic domains in the spin ordered phase is further evidenced by an additional 3-fold magnetic anisotropy appearing below TN. We discuss the effects of rotational magnetic domains on isothermal magnetization and magnetostriction and interpret our results on the basis of a multi-domain phenomenological model.

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Enhanced Hydrogen Storage Properties of LiAlH₄ by Excellent Catalytic Activity of XTiO₃@h‐BN (X = Co, Ni)

Wei

Liu

Zhang

et al. 2021

Adv Funct Materials

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The high desorption temperature and slow kinetics still restrict the applications of LiAlH 4 in hydrogen storage. To solve the above problems, NiTiO 3 @h-BN and CoTiO 3 @h-BN prepared for the first time are introduced into LiAlH 4 by ball milling. LiAlH 4 doped with 7 wt% NiTiO 3 @h-BN, selected as an optimal doping sample, starts to release hydrogen at 68.1 °C, and the total amount of hydrogen released is 7.11 wt% below 300 °C. The activation energies (E a ) of the two-step hydrogen release reactions are 55.93 and 59.25 kJ•mol −1 , which are 45.8% and 69.0% lower than those of as-received LiAlH 4 , respectively. Under 30 bar hydrogen pressure and 300 °C constant temperature, LiAlH 4 doped with 7 wt% NiTiO 3 @h-BN after dehydrogenation can absorb ≈1.05 wt% hydrogen. Based on density functional theory calculations, AlNi 3 and NiTi, in situ formed nanoparticles during ball milling, can decrease the desorption energy barrier of AlH bonding in LiAlH 4 and accelerate the breakdown of AlH bonding due to the interfacial charge transfer and the dehybridization. Furthermore, NiTi can enhance the adsorption and splitting of H 2 , promoting the activation of H 2 molecules during the rehydrogenation process.

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Lattice dynamics and spontaneous magnetodielectric effect in ilmenite CoTiO3

Cited by 19 publications

References 65 publications

Out-of-plane magnetic anisotropy in bulk ilmenite $\text{CoTiO}_3$

Out-of-plane magnetic anisotropy in bulk ilmenite $\text{CoTiO}_3$

Magnetostriction and magnetostructural domains in CoTiO$_3$

Enhanced Hydrogen Storage Properties of LiAlH₄ by Excellent Catalytic Activity of XTiO₃@h‐BN (X = Co, Ni)

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Lattice dynamics and spontaneous magnetodielectric effect in ilmenite CoTiO3

Cited by 19 publications

References 65 publications

Out-of-plane magnetic anisotropy in bulk ilmenite $\text{CoTiO}_3$

Out-of-plane magnetic anisotropy in bulk ilmenite $\text{CoTiO}_3$

Magnetostriction and magnetostructural domains in CoTiO$_3$

Enhanced Hydrogen Storage Properties of LiAlH4 by Excellent Catalytic Activity of XTiO3@h‐BN (X = Co, Ni)

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Product

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About

Enhanced Hydrogen Storage Properties of LiAlH₄ by Excellent Catalytic Activity of XTiO₃@h‐BN (X = Co, Ni)