Temperature dependence of the spin resistivity in ferromagnetic thin films: Monte Carlo simulations

Akabli, K.; Diep, H. T.

doi:10.1103/physrevb.77.165433

Cited by 19 publications

(39 citation statements)

References 22 publications

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“…In our recent work, we found from our MC simulation [31] that the resistivity's peak is due to the scattering by antiparallel-spin clusters which exist when one enters the critical region. Below the transition temperature, there exists a single large cluster of lattice spins with some isolated "defects" (i. e. clusters of antiparallel spins), so that the resistance decreases with decreasing T just after T c .…”

Section: Results On Ferromagnetic Thin Filmsmentioning

confidence: 99%

“…Note that, as described in subsection 2.2, in this work the averaging length 10 6 MC steps per spin has been divided into 200 segments of 5000 MC steps; between two consecutive segments we thermalize again our lattice over several thousands of MC steps par spin to explore a maximum of lattice configurations encountered by itinerant spins. In doing so we reduce statistical fluctuations observed in our old works [30,31].…”

Section: Results On Ferromagnetic Thin Filmsmentioning

confidence: 99%

“…Note that unlike in the previous works [30,31] where the lattice spin configuration is frozen while calculating the resistivity, we use here several thousands of configurations in each of which the resistivity is averaged with many thousands of passages. In our previous works, though the overall number of MC steps per spin was as high as in this work, the fact that we have used only a dozen lattice configurations for resistivity calculation has shown strong fluctuations in the result.…”

Section: Monte Carlo Methodsmentioning

confidence: 99%

“…To know this number, we count them at three "detector" surfaces perpendicular to the x direction: the first at N x /4, the second at N x /2 and the third at 3N x /4. Averaging the resistivity at these three system positions helps to improve further the results (in our previous works [31] we counted them only at the end of the sample).…”

Section: Monte Carlo Methodsmentioning

confidence: 99%

“…[28] and [29]. In spite of these intensive investigations, except our works [30,31], there have been no Monte Carlo (MC) simulations performed regarding the temperature dependence of the spin transport. In these works , we have investigated by MC simulations the effects of magnetic ordering on the spin current in magnetic multilayers.…”

Section: Introductionmentioning

confidence: 99%

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Monte Carlo study of the spin transport in magnetic materials

Magnin¹,

Akabli²,

Diep³

et al. 2010

Computational Materials Science

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The resistivity in magnetic materials has been theoretically shown to depend on the spin-spin correlation function which in turn depends on the magnetic-field, the density of conduction electron, the magnetic ordering stability, etc. However, these theories involved a lot of approximations, so their validity remained to be confirmed. The purpose of this work is to show by newly improved extensive Monte Carlo (MC) simulation the resistivity of the spin resistivity from low-T ordered phase to high-T paramagnetic phase in ferromagnetic and antiferromagnetic films. We take into account the interaction between the itinerant spins and the localized lattice spins as well as the interaction between itinerant spins themselves. We show that in ferromagnets the resistivity shows a sharp peak at the magnetic phase transition in agreement with previous theories in spite of their numerous approximations. Resistivity in antiferromagnets on the other hand shows no peak for the SC, BCC and diamond lattices. Discussion on the origin of these resistivity behaviors is given.

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Section: Results On Ferromagnetic Thin Filmsmentioning

confidence: 99%

Section: Results On Ferromagnetic Thin Filmsmentioning

confidence: 99%

Section: Monte Carlo Methodsmentioning

confidence: 99%

Section: Monte Carlo Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Monte Carlo study of the spin transport in magnetic materials

Magnin¹,

Akabli²,

Diep³

et al. 2010

Computational Materials Science

Self Cite

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Thermoelectric, Magnetic, and Mechanical Characteristics of Antiferromagnetic Manganese Telluride Reinforced with Graphene Nanoplates

2020

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Mechanical and thermal stability are the two challenging aspects of thermoelectric compounds and modules. Microcrack formation during material synthesis and mechanical failure under thermo-mechanical loading is commonly observed in thermoelectric materials made from brittle semiconductors. Herein, the results of graphene-nanoplates (GNPs) reinforcement on the mechanical and thermoelectric properties of MnTe compound are reported. The binary antiferromagnetic MnTe shown promising thermoelectric characteristics due to the paramagnon-hole drag above the Néel temperature. In this study, different bulk MnTe samples are synthesized with the addition of GNPs in a small quantity (0.25-1 wt%) by powder metallurgy and spark plasma sintering. The thermoelectric factors, magnetic behavior, microstructure, and mechanical properties of the samples are evaluated and analyzed. Nearly 33% improvement is observed in the fracture toughness of MnTe reinforced with 0.25 wt% GNPs compared to the pristine structure. The Néel temperature remains approximately unaffected with the GNP inclusion; however, the low-temperature ferromagnetic phase impurity is significantly suppressed. The thermal conductivity and power factor decrease almost equally by %34% at 600 K; hence, the thermoelectric figure-of-merit is not affected by GNP reinforcement in the optimized sample.

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