Magneto-ferroelectric interaction in superlattices: Monte Carlo study of phase transitions

Sharafullin, Ildus F.; Kharrasov, M. Kh.; Diep, H. T.

doi:10.1016/j.jmmm.2018.12.088

Cited by 7 publications

(3 citation statements)

References 25 publications

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“…Finally, we mention that we have found skyrmions confined at the interface of a superlattice composed alternately of a ferromagnetic film and a ferroelectric film [ 114 , 115 , 116 ]. These results may have important applications.…”

Section: Skyrmions In Thin Films and Superlatticesmentioning

confidence: 99%

Phase Transition in Frustrated Magnetic Thin Film—Physics at Phase Boundaries

Diep

2019

Entropy

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In this review, I outline some principal theoretical knowledge on the properties of frustrated systems and thin films. The two points I would like to emphasize: i) the physics in low dimensions where exact solutions can be obtained, ii) the physics at phase boundaries where spectacular phenomena can occur due to competing interactions of the two phases around the boundary. This competition causes a frustration. I will concentrate my attention to thin films and phenomena occurring near the boundary of two phases of different symmetries. The case of two-dimensional (2D) systems is in fact the limiting case of thin films with a monolayer. Naturally, I will treat this case at the beginning. After a short introduction on frustrated spin systems, I show several 2D frustrated Ising spin systems which can be exactly solved by using vertex models. These systems contain most of the spectacular effects due to the frustration: high ground-state degeneracy, existence of several phases in the ground-state phase diagram, multiple phase transitions with increasing temperature, reentrance, disorder lines, partial disorder at equilibrium. Evidences of such effects in non solvable models are also shown and discussed. Thin films are next presented with different aspects: surface elementary excitations (surface spin-waves), surface phase transition and criticality. Several examples are shown and discussed. New results on skyrmions in thin films and superlattices are also displayed.

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Section: Skyrmions In Thin Films and Superlatticesmentioning

confidence: 99%

Phase Transition in Frustrated Magnetic Thin Film—Physics at Phase Boundaries

Diep

2019

Entropy

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“…Moreover, these magnetic materials are normally combined with ferroelectrics and piezoelectrics, reaching multiferroic properties. In the case of piezoelectrics, the material is deformed, and the deformation produces an electric field; the deformation affects the piezoelectric material, and also the magnetic part of the system, changing its magnetic behavior [16].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Pressure on the Formation of FM/AF Configurations in LSMO Films: A Monte Carlo Approach

et al. 2020

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In this work, Monte Carlo simulations of magnetic properties of thin films, including the influence of an external pressure, are presented. These simulations were developed using a Hamiltonian composed by terms that represent the exchange interaction, dipolar interaction, Zeeman effect, monocrystalline anisotropy, and pressure influence. The term that represents the pressure influence on the magnetic properties was included, since for many applications, magnetic materials are a part of a multiferroic material together with a piezoelectric or a ferroelectric compound. Initially, the model was developed using generic parameters, in order to probe its suitable performance; after that, parameters were adjusted for simulating thin films of La0.67Sr0.33MnO3, a manganite with several technological applications because its Curie temperature is greater than room temperature. Including the pressure influence, it was observed the formation of several kind of FM/AF configurations as strip, labyrinth, and chess board forms. Furthermore, it was observed that, as the pressure increased, the critical temperature tended to decrease, and this result was in agreement with experimental reports.

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“…Всестороннее исследование магнитоэлектрических эффектов в этих системах представляет большой фундаментальный интерес в силу их особенностей, таких как размерная зависимость параметров дальнего порядка [6,7,10,11]. В работе [12,13] [14] при определенных концентрациях манганита. В работе [15] проведено МК-моделирование двухслойной пленки со структурой LaSrMnO \ PbZrTiO.…”

Section: Introductionunclassified

Magnetoelectric interaction at the interface in the superlattices of multiferroic: Monte Carlo study of the phase transitions

Yuldasheva

Nugaeva

2019

Lett. Mater.

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In this work, we study the phase transitions and surface properties of a multiferroic superlattice by Monte-Carlo simulation. The superlattice is formed by alternating magnetic and ferroelectric layers. We consider a multilayer film of a multiferroic consisting of L m z ferromagnetic layers and L f z ferroelectric layers sandwiched in the z-direction. Each xy plane has the dimension L × L. We consider the magnetic film as a film with a body-centered cubic lattice, the ferroelectric film as a film with a simple cubic lattice. For MC simulations, we use the Metropolis algorithm for a system with linear dimensions L × L × L z . We varied L in the range L = 40, 60, 80, 100 to determine size effects. In numerical simulations, the thickness of the superlattice was chosen with L z = 8, 16, 12, 24. The effect of temperature, external magnetic and electric fields, and the magnetoelectric coupling at the interface in the region of phase transitions was investigated. The phase diagram shows that the transition temperature increases with an increase in the magnetoelectric interaction parameter |J mf | on the interface. The secondorder phase transition in the superlattice occurs in the region of values from J mf = 0 to J mf = −3.3. When J mf = −2.5 and above, phase transitions occur at the same temperature. After J mf = −3.5 in both subsystems the first-order phase transition occurs. The transition temperatures, the magnetization of the layer, the polarization of the layer, the susceptibility, the internal energy, the magnetization and the polarization of the interface are determined. The dependences of the magnetization and polarization of surface layers on temperature are studied for various parameters of the magnetoelectric interaction and the values of external fields. The obtained results show that in the temperature dependence of energy and other physical quantities at low temperatures there are no regions of metastability.

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Magneto-ferroelectric interaction in superlattices: Monte Carlo study of phase transitions

Cited by 7 publications

References 25 publications

Phase Transition in Frustrated Magnetic Thin Film—Physics at Phase Boundaries

Phase Transition in Frustrated Magnetic Thin Film—Physics at Phase Boundaries

The Influence of Pressure on the Formation of FM/AF Configurations in LSMO Films: A Monte Carlo Approach

Magnetoelectric interaction at the interface in the superlattices of multiferroic: Monte Carlo study of the phase transitions

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