Dimensionality crossover in critical behaviour of ultrathin ferromagnetic films

Прудников, П. В.; Прудников, В. В.; Menshikova, Maria A.; Piskunova, N.

doi:10.1016/j.jmmm.2015.03.075

Cited by 46 publications

(19 citation statements)

References 33 publications

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“…This crossover had been observer in behaviour of critical exponent β. It was obtained in paper devoted to the experimental study of the critical behavior of thin films [15] and MC simulation of anisotropic Heisenberg model [16,17]. Dependence of critical exponents z, θ ′ , β/ν from film thickness was obtain.…”

Section: Discussionmentioning

confidence: 99%

Non-equilibrium critical behavior of thin Ising films

Медведева

Прудников

Elin

2017

Journal of Magnetism and Magnetic Materials

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In this paper we study the non-equilibrium properties of Ising ferromagnetic films using Monte Carlo simulations by short-time dynamic method. We have found thickness dependency of critical exponents z, θ ′ and β/ν. Ageing effects were observed in nonequilibrium critical behavior. Former was carried out both from high-temperature and low-temperature initial states. A characteristic time of relaxation, which diverges at a transition temperature in the thermodynamic limit, is obtained as a function of the system size and waiting time.

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Section: Discussionmentioning

confidence: 99%

Non-equilibrium critical behavior of thin Ising films

Медведева

Прудников

Elin

2017

Journal of Magnetism and Magnetic Materials

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“…However, for structures with N ≤ 11 and N ≥ 25 the magnetoresistance is characterized by fast falling down practically before null in the same interval of temperatures. Note that the observable changes of the magnetoresistance with increasing thickness of ferromagnetic films N correspond to dimensional changes of the critical temperature of ferromagnetic phase transition in Heisenberg films revealed in papers [16,17] and agree with results of the experimental investigations of dimensional phenomena in the ultrathin films Fe, Co, and Ni on substrates from nonmagnetic metals [1]. In accordance with papers [16,17], the films with thicknesses in interval N = 13 ÷ 20 in which the magnetoresistance takes on a maximal values with very slow temperature falling down correspond to Heisenberg films demonstrating the critical behavior of the 3D Ising model.…”

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confidence: 81%

“…The Monte Carlo study of dimensional crossover effects in the critical properties of multilayer Heisenberg films have been performed in works [16,17]. For films with different thicknesses it was taken into account the effect of anisotropy generated by the crystal field of the substrate.…”

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confidence: 99%

“…In this paper we apply the methodology and results of the multilayer Heisenberg films studies obtained in [16,17] to Monte-Carlo simulations and calculation of magnetic properties in magnetic multilayer and spin valve sandwich structures. At first, data of the microscopic spin configurations of ferromagnetic films were used for the calculation of the magnetoresistance temperature dependence for these structures with different thicknesses of the ferromagnetic films.…”

mentioning

confidence: 99%

“…The dependence of the anisotropy parameter ∆(N ) from the film thickness N is selected in accordance with the results in articles [16,17]. At first stage, we considered in this paper the multilayer structure which consists of two ferromagnetic films separated by a nonmagnetic metal film (Fig.…”

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Monte Carlo simulation of magnetic multilayered structures with giant magnetoresistance effects

Прудников

Romanovskiy

2016

J. Phys.: Conf. Ser.

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Abstract. Description of giant magnetoresistance effects in magnetic multilayered structures with the use of the anisotropic Heisenberg model for determination of magnetic properties of thin ferromagnetic films forming these structures is given. Monte Carlo simulations of magnetic properties for structures, which are constructed from two ferromagnetic films divided by nonmagnetic film, are carried out. The temperature and magnetic field dependencies are considered for ferromagnetic and antiferromagnetic configurations of these structures. The calculation of the magnetoresistance is carried out for different thicknesses of the ferromagnetic films. It was shown, that the obtained temperature dependence for the magnetoresistance is agreed very well with experimental results, measured for the magnetic multilayered structures similar to structures, which are considered in our investigations.The physics of ultrathin magnetic films with thickness from one and two to several tens of monolayers appears as a direction of intensive research over the past two decades (for a review see [1]). This heightened interest of scientists is caused by quite a number of unique properties of films different from properties of bulk materials, that defines an importance of these objects for the new facilities of fundamental physics of magnetism, surface physics and their practical applications [2,3]. Thus, the ultrathin films of magnetic metals and alloys are used as the building blocks for magnetic multilayer structures. These artificial created magnetic superlattices has become of great interest in wide range of applications based on the phenomena of the giant magnetoresistance (GMR) [4][5][6] and the tunneling magnetoresistance (TMR) [7][8][9].The multilayer structures with GMR effects consist of the ferromagnetic layers separated by nonmagnetic layers. The thickness of these nonmagnetic metal layers are selected in such a way that the long-range and oscillating RKKY exchange interaction between the spins of the ferromagnetic layers is effective antiferromagnetic. Through this interaction, the magnetizations of the adjacent ferromagnetic layers are oriented opposite to each other. When this structure is placed in an external magnetic field, the magnetization of layers begin to orient in parallel, that leads to a significant change in electrical resistance. Devices based on the GMR effect are widely used as read heads of hard disks, memory devices, sensors, etc [2,10,11].Achievements in the development of technology give possibility now to receive a high-quality ultrathin films and multilayer coatings on the basis of the magnetic transition metals Fe, Co, and Ni [1]. Investigation of the nature of magnetism in ultrathin films and multilayer structures has a large fundamental interest because the dimensional dependence of the magnetic characteristics which demostrate the transition from the specific bulk values for films with thickness of several tens monolayers (d ≥ 10 nm) to the two-dimensional values in films with thickness less than...

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Non-equilibrium critical dynamics of multilayer magnetic structures

Прудников

Purtov

et al. 2019

Journal of Magnetism and Magnetic Materials

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Dimensionality crossover in critical behaviour of ultrathin ferromagnetic films

Cited by 46 publications

References 33 publications

Non-equilibrium critical behavior of thin Ising films

Non-equilibrium critical behavior of thin Ising films

Monte Carlo simulation of magnetic multilayered structures with giant magnetoresistance effects

Non-equilibrium critical dynamics of multilayer magnetic structures

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