Phase Transition and Magnetoelectric Effect in 2D Ferromagnetic Films on a Ferroelectric Substrate

Bychkov, Igor V.; Белим, С. В.; Maltsev, Ivan; Шавров, В. Г.

doi:10.3390/coatings11111325

Cited by 6 publications

(9 citation statements)

References 15 publications

(16 reference statements)

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“…U 2 x , z = A 0 z , σ 0 + A 2 z , σ 0 cos 4πx (10) This expression also boils down to the Frenkel-Kontorova potential. The potential U 2 (x , z ) has a period of two times less than that for the substrate atoms.…”

Section: 𝑈(𝑥′ 𝑧′mentioning

confidence: 75%

“…The potential of the atom's chain is approximated by the formula with two terms at the point 𝜎 0 . 𝑈 2 (𝑥′, 𝑧′) = 𝐴 0 (𝑧′, 𝜎 0 ) + 𝐴 2 (𝑧′, 𝜎 0 )cos(4π𝑥′) (10) This expression also boils down to the Frenkel-Kontorova potential. The potential 𝑈 2 (𝑥′, 𝑧′) has a period of two times less than that for the substrate atoms.…”

Section: 𝑈(𝑥′ 𝑧′mentioning

confidence: 81%

“…Solitons are of the greatest interest. Calculations for the two-dimensional case show ordered structures in a monoatomic film [10][11][12]. These structures alter the magnetic properties of the ferromagnetic film on the substrate.…”

Section: Introductionmentioning

confidence: 97%

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Simulation of Epitaxial Film–Substrate Interaction Potential

2022

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The formation of the substrate surface potential based on the Lennard-Jones two-particle potential is investigated in this paper. A simple atom’s square lattice on the substrate surface is considered. The periodic potential of the substrate atoms is decomposed into a Fourier series. The amplitude ratio for different frequencies has been examined numerically. The substrate potential is approximated with high accuracy by the Frenkel–Kontorova potential at most parameter values. There is a field of parameters in which the term plays a significant role, with a period half as long as the period of the substrate atoms. The ground state of the monoatomic film is modeled on the substrate potential. The film may be in both crystalline and amorphous phases. The transition to the amorphous phase is associated with a change in the landscape of the substrate potential. There are introduced order parameters for structural phase transition in the thin film. When changing the parameters of the substrate, the order parameter experiences a jump when changing the phase of the film.

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Section: 𝑈(𝑥′ 𝑧′mentioning

confidence: 75%

Section: 𝑈(𝑥′ 𝑧′mentioning

confidence: 81%

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Simulation of Epitaxial Film–Substrate Interaction Potential

2022

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“…For instance, a large variety of molecular and biomolecular ferroelectrics can be used as the spin transport medium in OMFJs. Extensively used magnetic films may be replaced by other magnetic compounds with high polarization in spin [25,[80][81][82][83], new magnetic constituents such as 2D van der Waals materials [169][170][171][172][173][174][175], or 2D networks of organic and metal-organic magnets on surfaces [110][111][112][176][177][178][179][180][181][182][183], metal-organic frameworks [20,21], heterostructures [110,111,[184][185][186] and organic spinterfaces [13,49,51,[90][91][92]163,187] as electrodes to improve the spin injection and/or the functionality of OMFJs. A few recent successful examples already include some of these new alternative types of electrodes for photovoltaic [188], capacitive [189] and spin-crossover [190] devices.…”

Section: Discussionmentioning

confidence: 99%

Advances in Organic Multiferroic Junctions

Borca

2024

Coatings

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Typically, organic multiferroic junctions (OMFJs) are formed of an organic ferroelectric layer sandwiched between two ferromagnetic electrodes. The main scientific interest in OMFJs focuses on the magnetoresistive properties of the magnetic spin valve combined with the electroresistive properties associated with the ferroelectric junction. In consequence, memristive properties that couple magnetoelectric functionalities, which are one of the most active fields of research in material sciences, are opening a large spectrum of technological applications from nonvolatile memory to elements in logic circuits, sensing devices, energy harvesting and biological synapsis models in the emerging area of neuromorphic computing. The realization of these multifunctional electronic elements using organic materials is presenting various advantages related to their low-cost, versatile synthesis and low power consumption functioning for sustainable electronics; green disintegration for transient electronics; and flexibility, light weight and/or biocompatibility for flexible electronics. The purpose of this review is to address the advancement of all OMFJs including not only the achievements in the charge and spin transport through OMFJs together with the effects of electroresistance and magnetoresistance but also the challenges and ways to overcome them for the most used materials for OMFJs.

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“…The dependence of the exchange integral for the spin–spin interaction on distance has a main influence on the change in magnetic properties. Studies of the substrate deformations effect on the magnetic properties of single-layer 2D films on a non-magnetic substrate [ 11 , 12 , 13 ] have shown that uniform substrate deformations can lead to non-uniform film deformations at the free ends of the film. Islands with increased concentration of atoms are formed in the film when the substrate is compressed.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Phase Transitions in Ferromagnetic Nanofilms on a Non-Magnetic Substrate by Computer Simulation

Белим

2022

Materials

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Magnetic properties of ferromagnetic nanofilms on non-magnetic substrate are examined by computer simulation. The substrate influence is modeled using the two-dimensional Frenkel-Kontorova potential. The film has a cubic crystal lattice. Cases of different ratio for substrate period and ferromagnetic film period are considered. The difference in film and substrate periods results in film deformations. These deformations result in a change in the magnetic properties of the film. The Ising model and the Metropolis algorithm are used for the study of magnetic properties. The dependence of Curie temperature on film thickness and substrate potential parameters is calculated. Cases of different values for the coverage factor are considered. The deformation of the film layers is reduced away from the substrate when it is compressed or stretched. The Curie temperature increases when the substrate is compressed and decreases when the substrate is stretched. This pattern is performed for films with different thicknesses. If the coating coefficient for the film is different from one, periodic structures with an increased or reduced concentration of atoms are formed in the film first layer. These structures are absent in higher layers.

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Phase Transition and Magnetoelectric Effect in 2D Ferromagnetic Films on a Ferroelectric Substrate

Cited by 6 publications

References 15 publications

Simulation of Epitaxial Film–Substrate Interaction Potential

Simulation of Epitaxial Film–Substrate Interaction Potential

Advances in Organic Multiferroic Junctions

Investigation of Phase Transitions in Ferromagnetic Nanofilms on a Non-Magnetic Substrate by Computer Simulation

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