Aging effects in the nonequilibrium behavior of multilayer magnetic superstructures

Прудников, В. В.; Прудников, П. В.; Purtov, A. N.; Mamonova, M. V.

doi:10.1134/s0021364016230132

Cited by 14 publications

(7 citation statements)

References 21 publications

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“…As it was shown in works [17,18], the effects of slow dynamics appear in magnetic superstructures within a wide range of temperatures at TT c .…”

Section: Simulation Of Equilibrium Properties Of the Multilayer Magnementioning

confidence: 55%

“…The results of the present study can be compared with results of our calculations of equilibrium critical characteristics for Co/Cr/Co structure with cobalt film thickness N=3 [18]. We have determined the temperature T c (N=3)=0.78(3) of the ferromagnetic phase transition in ferromagnetic films and the temperature T N =0.…”

Section: Simulation Of Equilibrium Properties Of the Multilayer Magnementioning

confidence: 79%

“…The aging is displayed most pronouncedly in twotime dependence of the autocorrelation function (7) during evolution of system from the high-temperature initial state. So, it was shown in work [18] for Co/Cr/Co magnetic structure with ferromagnetic films thickness N=3 that correlation times in the course of system's evolution from a high-temperature initial state are twothree orders of magnitude more than those in the evolution from a low-temperature initial state at the same t w values. Therefore, for clearing-up the aging effects in Co/Cu(100)/Co magnetic structure dependence on ferromagnetic film thicknesses N in a wide quenching temperature range T s T c , we concentrate our efforts uppermost on study of autocorrelation function two-time behavior with evolution from the high-temperature initial state with T T c 0 > and m 0 =0.…”

Section: Simulation Of Equilibrium Properties Of the Multilayer Magnementioning

confidence: 99%

“…That is why the aging and nonergodicity effects can be experimentally observed in the multilayer Co/Cr magnetic structure [17] within a wider temperature range as compared to that for the bulk magnetic systems. We have performed in the paper [18] a numerical Monte Carlo simulation of the nonequilibrium behavior of the multilayer Co/Cr/Co magnetic structure with the thickness of Co films equals to N=3 monolayers. Calculations of the two-time correlation functions and the staggered magnetization allow us to reveal the aging effects, which are characterized by slowing down of correlation and relaxation processes with an increase in the system's 'age' t w as the time between a sample preparation and the beginning of measurement of its characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…The values of calculated critical exponents in papers [23,24] clearly demonstrate the dimensional crossover from the two-dimensional to three-dimensional properties of the films with an increase in the number of monolayers. We have applied in work [18] the methodology and results of the multilayer Heisenberg film studies from papers [23,24] to Monte Carlo simulations and calculation of magnetic properties in magnetic multilayer structure Co/Cr/Co in which ferromagnetic layers of the cobalt separated by nonmagnetic layer of the chromium.…”

Section: Introductionmentioning

confidence: 99%

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Manifestation of aging in giant magnetoresistance of the Co/Cu/Co nanostructure

Прудников

Mamonova

et al. 2019

J. Phys. Commun.

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A Monte Carlo simulation of the non-equilibrium behavior of multilayer magnetic nanostructure Co/Cu(100)/Co consisting of alternating magnetic and nonmagnetic nanolayers is carried out. Analysis of calculated two-time autocorrelation function for structure relaxing from both hightemperature and low-temperature initial states reveals aging characterized by a slowing down of correlation characteristics with increase of the waiting time. It is shown that, in contrast to bulk magnetic systems, the aging effects in nanostructure arise not only at the ferromagnetic ordering temperature T c but also within a wide temperature range at TT c . For evolution from hightemperature initial state, the study of dependence of aging characteristics on thickness N of cobalt films reveals a weakening of the aging with increasing N at the critical temperatures T c (N) and an opposite tendency at temperatures T<T c (N) with strengthening of aging with increasing N for considered N9 ML. This phenomenon is connected with increasing correlation and relaxation times in nanostructures when temperature is decreased. For case of the low-temperature initial state, it is shown that correlation times are two-three orders of magnitude smaller than those in the evolution from a high-temperature initial state at the same t w values. In this case, time behavior of the autocorrelation function doesn't depend considerably on temperature for T s T c and thickness N of cobalt films. Simulation of transport properties in Co/Cu(100)/Co structure permitted to calculate temperature dependence of its equilibrium magnetoresistance values. For the first time, it was revealed influence of non-equilibrium behavior on the magnetoresistance with demonstration of nontrivial aging effects. It has been shown that the magnetoresistance reaches plateau in asymptotic long-time regime with values N T , d ¥ ( ), which depend on type of initial state, thickness of cobalt films, and temperature.

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“…As it was shown in works [17,18], the effects of slow dynamics appear in magnetic superstructures within a wide range of temperatures at TT c .…”

Section: Simulation Of Equilibrium Properties Of the Multilayer Magnementioning

confidence: 55%

Section: Simulation Of Equilibrium Properties Of the Multilayer Magnementioning

confidence: 79%

Section: Simulation Of Equilibrium Properties Of the Multilayer Magnementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%