A short history of multiferroics

Lottermoser, Thomas; Meier, Dennis

doi:10.1515/psr-2020-0032

Cited by 21 publications

(7 citation statements)

References 74 publications

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“…11 Among other manifestations, the DMI is also invoked in multiferroic materials. 12,13 For those materials that exhibit both polarization and magnetization, one of the major challenges is to maximize the magneto-electric coupling. Indeed, while high electric polarizations are observed in non-magnetic ferroelectric materials, very weak electric polarizations are obtained in ferromagnetic systems.…”

Section: Introductionmentioning

confidence: 99%

How to create giant Dzyaloshinskii–Moriya interactions? Analytical derivation and ab initio calculations on model dicopper(II) complexes

Bouammali

Suaud

Martins

et al. 2021

The Journal of Chemical Physics

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This paper is a theoretical "proof of concept" on how the on-site first-order spin-orbit coupling can generate giant Dzyaloshinskii-Moriya interaction in binuclear transition metal complexes. This effective interaction plays a key role in strongly correlated materials, skyrmions, multiferroics, molecular magnets of promising use in quantum information science and computing. Despite this, its determination from both theory and experiment is still in its infancy and existing systems usually exhibit very tiny magnitudes. We derive analytical formulas that perfectly reproduce both the nature and the magnitude of the Dzyaloshinskii-Moriya interaction calculated using state-ofthe-art ab initio calculations performed on model bicopper(II) complexes. We also study which geometrical structures/ligand-field forces would enable one to control the magnitude and the orientation of the Dzyaloshinskii Moriya vector in order to guide future synthesis of molecules or materials. This article provides an understanding of its microscopic origin and proposes recipes to increase its magnitude. We show that i) the on-site mixings of 3d orbitals rules the orientation and magnitude of this interaction, ii) increased values can be obtained by choosing more covalent complexes, iii) huge values (~1000 cm -1 ) and controlled orientations could be reached by approaching structures exhibiting on-site first-order SOC, i.e. displaying an "unquenched orbital momentum".

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Section: Introductionmentioning

confidence: 99%

How to create giant Dzyaloshinskii–Moriya interactions? Analytical derivation and ab initio calculations on model dicopper(II) complexes

Bouammali

Suaud

Martins

et al. 2021

The Journal of Chemical Physics

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“…Moreover, our methodology of FD-FT THz-EPR in combination with magnetometry can be extended to study DM interactions in Cu II trimeric systems relevant for biological O 2 activation, , as well as molecular magnetism, and further classes of materials (e.g. multiferroics , ) where DM exchange is ascribed a decisive role for desired properties, such as spin-chiral magnetism and magnetoelectric coupling. , …”

Section: Discussionmentioning

confidence: 99%

Antisymmetric Spin Exchange in a μ-1,2-Peroxodicopper(II) Complex with an Orthogonal Cu–O–O–Cu Arrangement and S = 1 Spin Ground State Characterized by THz-EPR

Lohmiller

Spyra

Dechert

et al. 2022

JACS Au

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A unique type of Cu 2 /O 2 adduct with orthogonal (close to 90°) Cu–O–O–Cu arrangement has been proposed for initial stages of O 2 binding at biological type III dicopper sites, and targeted ligand design has now allowed us to emulate such an adduct in a pyrazolate-based μ - η 1 : η 1 -peroxodicopper(II) complex ( 2 ) with Cu–O–O–Cu torsion φ of 87°, coined ⊥ P intermediate. Full characterization of 2 , including X-ray diffraction ( d O–O = 1.452 Å) and Raman spectroscopy (ν̃ O–O = 807 cm –1 ), completes a series of closely related Cu 2 /O 2 intermediates featuring μ - η 1 : η 1 -peroxodicopper(II) cores with φ ranging from 55° ( A , cis -peroxo C P ; Brinkmeier A. Brinkmeier A. 34191490 J. Am. Chem. Soc. et al. 2021 143 10361 ) via 87° ( 2 , ⊥ P type) up to 104° ( B , approaching trans -peroxo T P ; Kindermann N. Kindermann N. Angew. Chem., Int. Ed. et al. 2015 54 1738 ). SQUID magnetometry revealed ferromagnetic interaction of the Cu II ions and a triplet ( S t = 1) ground state in 2 . Frequency-domain THz-EPR has been employed to quantitatively investigate the spin systems of 2 and B . Magnetic transitions within the triplet ground states confirmed their substantial zero-field splittings (ZFS) suggested by magnetometry. Formally forbidden triplet-to-singlet transitions at 56 ( 2 ) and 157 cm –1 ( B ), which are in agreement with the exchange coupling strengths J iso inferred from SQUID data, are reported for the first time for coupled dicopper(II) complexes. Rigorous analysis by spin-Hamiltonian-based simulations attributed the corresponding nonzero transition probabilities and the ZFS to substantial antisymmetric (Dzyaloshinskii–Moriya) exchange d and provided robust values and orientations for the d , J , and g tensors. These...

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“…The Magnetoelectric (ME) effect arises in multiferroic materials that are electrically and magnetically polarizable due to coupling between electrical polarization and magnetization. These materials are interesting for technological applications, such as magnetic field sensors, transducers, resonators, and devices that provide opportunities in the area of renewable and sustainable energy through energy harvesting [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…Maxwell's equations of classical electromagnetism state that, in free space, E and B are not independent but are intimately linked to each other 1 . Similarly, a theoretical method for the solid state that simultaneously describes relationships P $ H and B $ E (i.e.…”

Section: Introductionmentioning

confidence: 99%

Equivalent Circuit Model of Magnetostrictive/Piezoelectric Laminated Composite

Ruiz¹,

Razzitte²

2024

Novel Applications of Piezoelectric and Thermoelectric Materials

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An equivalent circuital model of magnetostrictive/piezoelectric laminated composite has been developed in order to predict its behavior in presence of dynamic electromagnetic fields. From magnetostrictive and piezoelectric constitutive equations, and using an equation of motion, magnetic-mechanical-electric equations are: obtained by building a symmetric adhoc equivalent circuit about the magnetoelectric (ME) coupling. The coefficients of the direct and converse effects are simulated. The circuit is further used to predict the voltage coefficients of laminated composite. The multilayer material is found to have significantly higher ME coefficients near resonance frequency. The ME coefficients and the voltage coefficients change significantly with the configuration of the multilayer, more specifically when the laminate operates in longitudinal-transverse (L-T) and transverse-transverse (T–T) modes.

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A short history of multiferroics

Cited by 21 publications

References 74 publications

How to create giant Dzyaloshinskii–Moriya interactions? Analytical derivation and ab initio calculations on model dicopper(II) complexes

How to create giant Dzyaloshinskii–Moriya interactions? Analytical derivation and ab initio calculations on model dicopper(II) complexes

Antisymmetric Spin Exchange in a μ-1,2-Peroxodicopper(II) Complex with an Orthogonal Cu–O–O–Cu Arrangement and S = 1 Spin Ground State Characterized by THz-EPR

Equivalent Circuit Model of Magnetostrictive/Piezoelectric Laminated Composite

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