Magnetic properties of a transverse spin-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mfrac><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:mfrac></mml:math>Ising film

Saber, M.; Ainane, A.; Dujardin, F.; Stébé, B.

doi:10.1103/physrevb.59.6908

Cited by 40 publications

(31 citation statements)

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“…Of these, magnetic films are very important from both the theoretical and the experimental standpoint [5][6], and can be studied as models of the magnetic size effect [7] and as quasi-two dimensional systems. The magnetic and phase transition properties of semi-infinite Ising systems have been investigated for many years [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…However, most of theoretical works on surface magnetism are based on the semi-infinite spin-1/2 Ising model with various free surfaces, in which the standard model [12] is the semi-infinite simple cubic spin-1/2 Ising ferromagnet with the (100) free surface. The simple model with modified surface exchange J s only at the surface has been investigated for many years using various techniques [8][9][10][11]. It is now well-known that for J s greater than a critical value J sc the system may order on the surface before it orders in the bulk [10][11].…”

Section: Introductionmentioning

confidence: 99%

“…The simple model with modified surface exchange J s only at the surface has been investigated for many years using various techniques [8][9][10][11]. It is now well-known that for J s greater than a critical value J sc the system may order on the surface before it orders in the bulk [10][11]. Below this critical value, the system becomes ordered at the bulk transition temperature.…”

Section: Introductionmentioning

confidence: 99%

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Phase Diagram of Spin-1/2 Ising Semi-Infinite and Film Ferromagnets with Spin-3/2 Overlayers

Bentaleb

Aouad

Saber

2002

phys. stat. sol. (b)

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Within the framework of the effective field theory, we examine the phase diagrams of a spin-1/2 Ising film, with a spin-3/2 atoms on the top and bottom surfaces, and the corresponding semiinfinite system. In particular, the effects of surface single-ion anisotropy on the phase diagram and critical value for surface ordering are clarified. The system shows the existence of a critical value of the ratio of the surface interaction to the bulk one above which the surface magnetism appears. This critical value moves to lower values when D s increases. The critical surface temperature exhibits a characteristic behavior namely when large negative D s are selected.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phase Diagram of Spin-1/2 Ising Semi-Infinite and Film Ferromagnets with Spin-3/2 Overlayers

Bentaleb

Aouad

Saber

2002

phys. stat. sol. (b)

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“…Using the effective field theory with a probability distribution technique [19], the longitudinal layer magnetizations of the film are derived in the same manner as for the transverse spin- 1 2 Ising superlattice [20,21] and they are given by…”

Section: Article In Pressmentioning

confidence: 99%

The critical properties of magnetic films

Saber

Ainane

Essaoudi

et al. 2010

Journal of Magnetism and Magnetic Materials

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“…Since then, this model has been applied to several physical systems like DyV O 2 . After then, this model has been extended to study of several other systems, such as JahnTeller and ferromagnetic systems [27] treated by means of a wide variety of techniques including MFA [28,29,30,31,32,33,34] and EFT [35,36,37,38,39]. Effect of the dilution on the phase diagrams and magnetic properties of the ferroelectric thin films (by means of the TIM) has been studied within the EFT formulation [40,41,42,43,44].…”

Section: Introductionmentioning

confidence: 99%

Effects of the randomly distributed magnetic field on the phase diagrams of the transverse Ising thin film

Akıncı

2013

Journal of Magnetism and Magnetic Materials

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The effect of the zero centered Gaussian random magnetic field distribution on the phase diagrams and ground state magnetizations of the transverse Ising thin film has been investigated. As a formulation, the differential operator technique and decoupling approximation within the effective field theory has been used. The variation of the phase diagrams with the Gaussian distribution width (σ) has been obtained and particular attention has been paid on the evolution of the special point coordinate with distribution parameter. In addition, the ground state longitudinal and transverse magnetization behaviors have been investigated in detail. IntroductionRecently there has been growing interest both theoretically and experimentally on the finite magnetic materials especially on semi-infinite systems and thin films, since the magnetic properties of free surfaces are drastically different from the bulk material, because the free surface breaks the translational symmetry, i.e. surface atoms are embedded in an environment of lower symmetry than that of the inner atoms [1,2]. If the surface exchange coupling is greater than a critical value, the surface region can exhibit an ordered phase even if the bulk is paramagnetic and it has a transition temperature higher than the bulk one. This fact has been observed experimentally [3,4,5].Also, the development of the molecular beam epitaxy technique and its application to the growth of thin metallic films has stimulated renewed interest in thin film magnetism. It was experimentally found that, the Curie temperature and the average magnetic moment per atom increases with the increasing thickness of the film [6,7]. Thin films can be modeled by Ising model due to the fact that, many ultrathin films do indeed exhibit a strong uniaxial anisotropy [8]. These systems have been widely studied in literature by means of several theoretical methods such as Monte Carlo (MC) simulations [9,10,11,12,13,14], mean field approximation (MFA) [15,16] and effective field theory (EFT) [17,18].But the study of ferroelectric films treated by transverse Ising model (TIM) are more common in the literature. Oxide thin films with perovskite-type structure (such as Barium titanate BaT iO 3 and Strontium titanate SrT iO 3 ) have been fabricated [19,20,21] and novel physical properties found in these ferroelectric thin films which have many application areas in technology [22], such as 1 umit.akinci@deu.edu.tr 1

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Magnetic properties of a transverse spin-12Ising film

Cited by 40 publications

References 40 publications

Phase Diagram of Spin-1/2 Ising Semi-Infinite and Film Ferromagnets with Spin-3/2 Overlayers

Phase Diagram of Spin-1/2 Ising Semi-Infinite and Film Ferromagnets with Spin-3/2 Overlayers

The critical properties of magnetic films

Effects of the randomly distributed magnetic field on the phase diagrams of the transverse Ising thin film

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