Publisher’s Note: Thermally Mediated Mechanism to Enhance Magnetoelectric Coupling in Multiferroics [Phys. Rev. Lett.<b>114</b>, 177205 (2015)]

Cm, Chang; Bk, Mani; Lisenkov, S.; Ponomareva, I.

doi:10.1103/physrevlett.116.019905

Cited by 3 publications

(3 citation statements)

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“…Moreover, focusing on high frequencies allows for establishment of the intrinsic limit for the ECE. While at present GHz-THz frequency range is above the range of practical utility for macroscopic cooling applications, it could potentially be highly relevant for other applications of ECE, such as temperature-mediated magnetoelectric coupling 27,28 .…”

Section: Methodsmentioning

confidence: 99%

High-frequency intrinsic dynamics of the electrocaloric effect from direct atomistic simulations

Lisenkov

Ponomareva

2018

Phys. Rev. B

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We propose a computational methodology capable of harvesting isothermal heat and entropy change in Molecular Dynamics simulations. The methodology is applied to study high frequency dynamics of the electrocaloric effect (ECE) in ferroelectric PbTiO 3. ECE is associated with a reversible change in temperature under adiabatic application of electric field or with a reversible change in entropy under isothermal application of the electric field. Accurate assessment of electrocaloric performance requires the knowledge of three quantities: isothermal heat, isothermal entropy change, and adiabatic temperature change. Our methodology allows computations of all these quantities directly, that is without restoring to the reversible thermodynamical models. Consequently, it captures both reversible and irreversible effects which is critical for ECE simulations. The approach is well suited to address dynamics of the ECE, which so far remains underexplored. We report the following basic features of the intrinsic dynamics of ECE: i) the ECE is independent of the electric field frequency, rate of application, or field profile; ii) the effect persists up to the frequencies associated with the onset of dielectric losses and deteriorates from there due to creation of irreversible entropy; iii) in the vicinity of the phase transition and in the paraelectric phase the onset of irreversible dynamics occurs at lower frequency as compared to the ferroelectric phase. The latter is attributed to lower intrinsic soft mode frequencies and and larger losses in the paraelectric phase.

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Section: Methodsmentioning

confidence: 99%

High-frequency intrinsic dynamics of the electrocaloric effect from direct atomistic simulations

Lisenkov

Ponomareva

2018

Phys. Rev. B

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“…Multiferroic materials have attracted considerable attention since they simultaneously show spontaneous electric and magnetic ordering in a single phase [1][2][3][4]. Moreover, coupling between the magnetic and ferroelectric order parameters can lead to a magnetoelectric (ME) effect [5][6][7], which therefore offers new approaches to the design and application of information storage devices, sensors, spintronics, and actuators.…”

Section: Introductionmentioning

confidence: 99%

Structural, Ferroelectric and Ferromagnetic Properties of Single-Phase Bi0.95Ba0.05FeO3 Thin Film Prepared by Pulsed Laser Deposition

Wen

Chen

Lin

2015

J Supercond Nov Magn

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Single-phase Bi 0.95 Ba 0.05 FeO 3 (BBFO) thin film was grown on Si (111) substrate by a pulsed laser deposition method. The analysis of crystal structure identifies that the BBFO thin film has a rhombohedrally distorted perovskite structure with R3c space group. The morphologies investigated by high-resolution field emission transmission electron microscopy and atomic force microscopy reveal that the BBFO thin film is polycrystalline and consists of uniform grains with an average size of about 110 nm, of which surfaces are smooth. Ferroelectric property of the BBFO thin film was analyzed and the remnant polarization (P r ) is about 3.9 μC cm −2 . Magnetic measurements reveal that the BBFO thin film has a strong ferromagnetic behavior at room temperature with a 36.76 emu cm −3 saturated magnetization (M s ) and 2998 Oe coercivity. Furthermore, the original mechanisms of ferroelectric and ferromagnetic properties were discussed. This work is believed to contribute a novel multiferroic material, which should open a way toward the integration of multiferroic material and semiconductor material for future tunable multifunctional devices.

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“…Recently, it has received a lot of attention, [1][2][3][4][5] thanks to the pioneering reports of giant effects in thin films [6,7] and its potential promise for solid-state refrigeration, which is regarded as an energy efficient, environmentally friendly alternative to conventional refrigeration, especially for miniaturized applications. [10,11] Among different materials, ferroics are known to exhibit superior caloric effects, most notably in the vicinity of phase transitions. [10,11] Among different materials, ferroics are known to exhibit superior caloric effects, most notably in the vicinity of phase transitions.…”

Section: Introductionmentioning

confidence: 99%

Unveiling Electrocaloric Potential of Antiferroelectrics with Phase Competition

Kingsland

Lisenkov

Ponomareva

2018

Advcd Theory and Sims

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Currently, the electrocaloric effect (ECE) is considered for applications in solid-state refrigeration. Direct semi-classical first-principles-based simulation to the case of ultra-thin PbZrO 3 films in order to unveil the unusual electrocaloric potential of antiferroelectrics with phase competition are applied. Strong enhancement of the ECE in the vicinity of the antiferroelectric-ferroelectric phase transition, the coexistence of electric-field tunable positive and negative ECE in antiferroelectrics, and a large ECE in the vicinity of lossless antipolar-polar phase transitions are predicted. Direct simulations demonstrate that phase switching, which occurs with hysteretic losses, gives rise to the irreversible heating which is explained using basic thermodynamics. A refrigeration cycle that tames the irreversible heating is proposed, tested in direct simulations, and found to outperform the conventional cycle based on fully reversible processes. Furthermore, direct simulations reveal critical misconceptions in the application of the controversial indirect approach to the case of ferroics with electric hysteresis. The route to overcoming the uncertainties with this dominant ECE investigation approach is proposed.

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Publisher’s Note: Thermally Mediated Mechanism to Enhance Magnetoelectric Coupling in Multiferroics [Phys. Rev. Lett.114, 177205 (2015)]

Abstract: This corrects the article DOI: 10.1103/PhysRevLett.114.177205.

Cited by 3 publications

References 0 publications

High-frequency intrinsic dynamics of the electrocaloric effect from direct atomistic simulations

High-frequency intrinsic dynamics of the electrocaloric effect from direct atomistic simulations

Structural, Ferroelectric and Ferromagnetic Properties of Single-Phase Bi0.95Ba0.05FeO3 Thin Film Prepared by Pulsed Laser Deposition

Unveiling Electrocaloric Potential of Antiferroelectrics with Phase Competition

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