magnetoelectric effect
Recently Published Documents


TOTAL DOCUMENTS

1115
(FIVE YEARS 207)

H-INDEX

66
(FIVE YEARS 6)

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 574
Author(s):  
Zukhra Gareeva ◽  
Anatoly Zvezdin ◽  
Konstantin Zvezdin ◽  
Xiangming Chen

In this article, we performed symmetry analysis of perovskite-based multiferroics: bismuth ferrite (BiFeO3)-like, orthochromites (RCrO3), and Ruddlesden–Popper perovskites (Ca3Mn2O7-like), being the typical representatives of multiferroics of the trigonal, orthorhombic, and tetragonal crystal families, and we explored the effect of crystallographic distortions on magnetoelectric properties. We determined the principal order parameters for each of the considered structures and obtained their invariant combinations consistent with the particular symmetry. This approach allowed us to analyze the features of the magnetoelectric effect observed during structural phase transitions in BixR1−xFeO3 compounds and to show that the rare-earth sublattice has an impact on the linear magnetoelectric effect allowed by the symmetry of the new structure. It was shown that the magnetoelectric properties of orthochromites are attributed to the couplings between the magnetic and electric dipole moments arising near Cr3+ ions due to distortions linked with rotations and deformations of the CrO6 octahedra. For the first time, such a symmetry consideration was implemented in the analysis of the Ruddlesden–Popper structures, which demonstrates the possibility of realizing the magnetoelectric effect in the Ruddlesden–Popper phases containing magnetically active cations, and allows the estimation of the conditions required for its optimization.


2022 ◽  
Vol 7 (1) ◽  
Author(s):  
S. Reschke ◽  
D. G. Farkas ◽  
A. Strinić ◽  
S. Ghara ◽  
K. Guratinder ◽  
...  

AbstractMagnetoelectric phenomena are intimately linked to relativistic effects and also require the material to break spatial inversion symmetry and time-reversal invariance. Magnetoelectric coupling can substantially affect light–matter interaction and lead to non-reciprocal light propagation. Here, we confirm on a fully experimental basis, without invoking either symmetry-based or material-specific assumptions, that the optical magnetoelectric effect in materials with non-parallel magnetization (M) and electric polarization (P) generates a trilinear term in the refractive index, δn ∝ k ⋅ (P × M), where k is the propagation vector of light. Its sharp magnetoelectric resonances in the terahertz regime, which are simultaneously electric and magnetic dipole active excitations, make Co2Mo3O8 an ideal compound to demonstrate this fundamental relation via independent variation of M, P, and k. Remarkably, the material shows almost perfect one-way transparency in moderate magnetic fields for one of these magnetoelectric resonances.


Magnetism ◽  
2022 ◽  
Vol 2 (1) ◽  
pp. 1-9
Author(s):  
Evgeniy K. Petrov ◽  
Vladimir M. Kuznetsov ◽  
Sergey V. Eremeev

Thin films of magnetic topological insulators (TIs) are expected to exhibit a quantized anomalous Hall effect when the magnetizations on the top and bottom surfaces are parallel and a quantized topological magnetoelectric effect when the magnetizations have opposite orientations. Progress in the observation of these quantum effects was achieved earlier in the films with modulated magnetic doping. On the other hand, the molecular-beam-epitaxy technique allowing the growth of stoichiometric magnetic van der Waals blocks in combination with blocks of topological insulator was developed. This approach should allow the construction of modulated heterostructures with the desired architecture. In the present paper, based on the first-principles calculations, we study the electronic structure of symmetric thin film heterostructures composed of magnetic MnBi2Se4 blocks (septuple layers, SLs) and blocks of Bi2Se3 TI (quintuple layers, QLs) in dependence on the depth of the magnetic SLs relative to the film surface and the TI spacer between them. Among considered heterostructures we have revealed those characterized by nontrivial band topology.


Author(s):  
Jiahua Min ◽  
Shuhan Zheng ◽  
Jingwen Gong ◽  
Xiyu Chen ◽  
Fei Liu ◽  
...  

2021 ◽  
Vol 119 (25) ◽  
pp. 252904
Author(s):  
Leonid Y. Fetisov ◽  
Dmitriy V. Saveliev ◽  
Mikhail V. Dzhaparidze ◽  
Vladimir I. Musatov ◽  
Yuri K. Fetisov

2021 ◽  
Author(s):  
◽  
Vaibhav Bhugra

<p>Abstract:   Multiferroics are a novel class of next generation multifunctional materials that exhibit simultaneous magnetic spin, electric dipole, and ferroelastic ordering. It gives an additional degree of freedom to design new devices. Magnetoelectric effect in these materials result in the manipulation of magnetic spins via applied electric field and vice versa, making them suitable for next generation applications. Single phase multiferroics show low magnetoelectric coefficient, hence there is a need to look at composite multiferroic structures with respective magnetic and ferroelectric phase. The magnetoelectric coefficient in the composite structures depends on the magnitude of strain induced by one phase to the other. This requires the need to study suitable magnetic and ferroelectric materials that can be combined to create magnetoelectric multiferroic composite structures. Also, higher surface to volume ratio at the nanoscale should enhance the interaction between the two phases. Here, in we synthesised and studied magnetic and ferroelectric structures that have potential to be used as the respective phases of multiferroic magnetoelectric composites.  Magnetic materials with high magnetostriction and low coercivity are suitable candidates for the formation of multiferroic composite. The size dependent and tuneable magnetic properties of cobalt ferrite and nickel-iron composites, respectively fulfil the above-mentioned criteria. Herein, the properties of the above magnetic materials were explored at nanoscale where efficient techniques such as thermal decomposition and electrospinning were applied. Cobalt ferrite nanoparticles with varying sizes were synthesised at the nanoscale and magnetic studies were performed to study their size dependent suitability to be used as a potential magnetic material in multiferroic composite formation. The nanoparticle synthesis by thermal decomposition of metal oleate precursors displayed reaction time dependent growth. The nanoparticles sized below superparamagnetic limit showed a negligible coercivity fulfilling an essential requirement to display magnetoelectric effect. Alongside, a successful synthesis of novel cobalt iron oxide (Co0.33Fe0.67O) nanoparticles was also performed. This displayed a synthesis dependent ferrimagnetic to antiferromagnetic phase transition in Co Fe-O structure at nanoscale. A controlled oxidation of Co0.33Fe0.67O could lead to the formation of antiferromagnetic-ferrimagnetic core-shell nanostructure that can overcome the superparamagnetic limit in nanoparticles system. They are potential materials in ME-RAMs. 1-D magnetic nanostructure show a sharp shape anisotropy and hence can be used as magnetic components of composite multiferroic structures. Nickel-iron composites in FCC phase were studied at the nanoscale in the form of fibres. Electrospinning of suitable metal precursors with PVP polymer followed by the reduction of nanofibres in H2 led to the formation of Ni0.47Fe0.53 fibre mats. They were ferromagnetic and displayed high saturation magnetisation along with low coercivity fulfilling the requirement to be used in magnetoelectric applications.   1-D flexible ferroelectric composite structures were studied alongside to be used as the ferroelectric component of multiferroic composites. Polyvinylidene fluoride was doped with DIPAB at varying ratios to study the improvement in the ferroelectric properties of the composite structure in comparison to just PVDF with low dielectric constant. Electrospinning of composite polymer solution led to the formation of DIPAB doped PVDF nanofibres. They displayed improved relative dielectric constant and low loss tangent and find use in composite magnetoelectric materials formation. The ease of processability of DIPAB doped PVDF nanofibres aids in incorporating the above studied magnetic materials.  The studies proved the worth of as-synthesised magnetic and ferroelectric materials at the nanoscale for the formation of magnetoelectric multiferroic composite nanomaterials. The cobalt ferrite nanoparticles doped in DIPAB-PVDF nanofibres can result in core-sheath ME composite structure. A coating of DIPAB-PVDF composite on the formed Ni0.47Fe0.53 fibres will result to the formation of 1-D magnetoelectric structures.</p>


2021 ◽  
Author(s):  
◽  
Vaibhav Bhugra

<p>Abstract:   Multiferroics are a novel class of next generation multifunctional materials that exhibit simultaneous magnetic spin, electric dipole, and ferroelastic ordering. It gives an additional degree of freedom to design new devices. Magnetoelectric effect in these materials result in the manipulation of magnetic spins via applied electric field and vice versa, making them suitable for next generation applications. Single phase multiferroics show low magnetoelectric coefficient, hence there is a need to look at composite multiferroic structures with respective magnetic and ferroelectric phase. The magnetoelectric coefficient in the composite structures depends on the magnitude of strain induced by one phase to the other. This requires the need to study suitable magnetic and ferroelectric materials that can be combined to create magnetoelectric multiferroic composite structures. Also, higher surface to volume ratio at the nanoscale should enhance the interaction between the two phases. Here, in we synthesised and studied magnetic and ferroelectric structures that have potential to be used as the respective phases of multiferroic magnetoelectric composites.  Magnetic materials with high magnetostriction and low coercivity are suitable candidates for the formation of multiferroic composite. The size dependent and tuneable magnetic properties of cobalt ferrite and nickel-iron composites, respectively fulfil the above-mentioned criteria. Herein, the properties of the above magnetic materials were explored at nanoscale where efficient techniques such as thermal decomposition and electrospinning were applied. Cobalt ferrite nanoparticles with varying sizes were synthesised at the nanoscale and magnetic studies were performed to study their size dependent suitability to be used as a potential magnetic material in multiferroic composite formation. The nanoparticle synthesis by thermal decomposition of metal oleate precursors displayed reaction time dependent growth. The nanoparticles sized below superparamagnetic limit showed a negligible coercivity fulfilling an essential requirement to display magnetoelectric effect. Alongside, a successful synthesis of novel cobalt iron oxide (Co0.33Fe0.67O) nanoparticles was also performed. This displayed a synthesis dependent ferrimagnetic to antiferromagnetic phase transition in Co Fe-O structure at nanoscale. A controlled oxidation of Co0.33Fe0.67O could lead to the formation of antiferromagnetic-ferrimagnetic core-shell nanostructure that can overcome the superparamagnetic limit in nanoparticles system. They are potential materials in ME-RAMs. 1-D magnetic nanostructure show a sharp shape anisotropy and hence can be used as magnetic components of composite multiferroic structures. Nickel-iron composites in FCC phase were studied at the nanoscale in the form of fibres. Electrospinning of suitable metal precursors with PVP polymer followed by the reduction of nanofibres in H2 led to the formation of Ni0.47Fe0.53 fibre mats. They were ferromagnetic and displayed high saturation magnetisation along with low coercivity fulfilling the requirement to be used in magnetoelectric applications.   1-D flexible ferroelectric composite structures were studied alongside to be used as the ferroelectric component of multiferroic composites. Polyvinylidene fluoride was doped with DIPAB at varying ratios to study the improvement in the ferroelectric properties of the composite structure in comparison to just PVDF with low dielectric constant. Electrospinning of composite polymer solution led to the formation of DIPAB doped PVDF nanofibres. They displayed improved relative dielectric constant and low loss tangent and find use in composite magnetoelectric materials formation. The ease of processability of DIPAB doped PVDF nanofibres aids in incorporating the above studied magnetic materials.  The studies proved the worth of as-synthesised magnetic and ferroelectric materials at the nanoscale for the formation of magnetoelectric multiferroic composite nanomaterials. The cobalt ferrite nanoparticles doped in DIPAB-PVDF nanofibres can result in core-sheath ME composite structure. A coating of DIPAB-PVDF composite on the formed Ni0.47Fe0.53 fibres will result to the formation of 1-D magnetoelectric structures.</p>


2021 ◽  
Author(s):  
Mengjuan Mi ◽  
Xingwen Zheng ◽  
Shilei Wang ◽  
Yang Zhou ◽  
Lixuan Yu ◽  
...  

How to electrically control magnetic properties of a magnetic material is promising towards spintronic applications, where the investigation of carrier doping effects on antiferromagnetic (AFM) materials remains challenging due to their zero net magnetization. In this work, we found electron doping dependent variation of magnetic orders of a two-dimensional (2D) AFM insulator NiPS3, where doping concentration is tuned by intercalating various organic cations into the van der Waals gaps of NiPS3 without introduction of defects and impurity phases. The doped NiPS3 shows an AFM-ferrimagnetic (FIM) transition at doping level of 0.2-0.5 electrons/cell and a FIM-AFM transition at doping level of ≥0.6 electrons/cell. We propose that the found phenomenon is due to competition between Stoner exchange dominated inter-chain ferromagnetic order and super-exchange dominated inter-chain AFM order at different doping level. Our studies provide a viable way to exploit correlation between electronic structures and magnetic properties of 2D magnetic materials for realization of magnetoelectric effect.


Sign in / Sign up

Export Citation Format

Share Document