NickelMaghrebV1, Main, Exploration, bibRecord, 000281

Experiment and Theoretical Study of Critical Behavior in Magnetic Multilayers

Identifieur interne : 000281 ( Main/Exploration ); précédent : 000280; suivant : 000282

Experiment and Theoretical Study of Critical Behavior in Magnetic Multilayers

Auteurs : R. Masrour [Maroc] ; M. Hamedoun [Maroc] ; A. Benyoussef [Maroc] ; H. Lassri [Maroc]

Source :

Journal of superconductivity and novel magnetism [ 1557-1939 ] ; 2012.

RBID : Pascal:12-0347555

Descripteurs français

Pascal (Inist)
- Haute température, Phénomène critique, Evaporation faisceau électronique, Ultravide, Propriété magnétique, Epaisseur, Aimantation spontanée, Multicouche magnétique, Nickel, Or, Argent, Cuivre, Approximation onde spin, Interaction échange, Onde spin, Développement série, 7570C, 7510, 8130B, 7550C, 8115H, 7530E.
Wicri :
- topic : Nickel, Or, Argent, Cuivre.

English descriptors

KwdEn :
- Copper, Critical phenomena, Electron beam evaporation, Exchange interactions, Gold, High temperature, Magnetic multilayers, Magnetic properties, Nickel, Series expansion, Silver, Spin wave approximation, Spin waves, Spontaneous magnetization, Thickness, Ultrahigh vacuum.

Abstract

Ni/NM multilayers (with noble metal NM = Au, Ag and Cu) were prepared by the electron beam evaporation method under ultra high vacuum conditions. The magnetic properties of Ni/NM multilayers are examined as a function of Ni layer thickness t_Ni. The temperature dependence of the spontaneous magnetization M(T) is well described by a T^3/2 law in all multilayers. A spin-wave theory has been used to explain the temperature dependence of the magnetization and the approximate values for the bulk Exchange interaction J_b and surface exchange interaction J_s for various Ni layer thicknesses have been obtained. In the other hand we have used the high-temperature series expansion technique, to analyze the phase transition and the critical phenomena of a ferromagnetic a two-component multilayer, through three models: Ising, XY and Heisenberg. The critical reduced temperature τ_c(ν) is studied as function of the thickness of constituents in the unit cell of the multilayer. In the two-component multilayer τ_c(ν) is studied as function of the exchange interaction in each material and within the interface J_s, J_b and J⊥, respectively. A critical value of the surface exchange interaction in the film and interface exchange interaction in the multilayer above which the surface and the interface magnetism appears is obtained. The dependence of the reduced critical temperature on the thickness of the film and the unit cell of multilayer has been investigated. The effects of an amorphous magnetic surface on the critical properties of the film of simple cubic lattice have been studied. A number of characteristic behaviors, such as the possibility of the existence of a critical length of the unit cell thickness at which the temperature of the multilayer remains insensitive to the exchange coupling within interface, are reported. In a defined range of the exchange interactions, the values of γ are comparable to the universal ones and are independent of the film thickness. The asymmetry of the structure and the competition of the effects of the exchange coupling are important for the magnetic properties of the system.

Affiliations:

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Le document en format XML

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<series><title level="j" type="main">Journal of superconductivity and novel magnetism</title>
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<seriesStmt><title level="j" type="main">Journal of superconductivity and novel magnetism</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Copper</term>
<term>Critical phenomena</term>
<term>Electron beam evaporation</term>
<term>Exchange interactions</term>
<term>Gold</term>
<term>High temperature</term>
<term>Magnetic multilayers</term>
<term>Magnetic properties</term>
<term>Nickel</term>
<term>Series expansion</term>
<term>Silver</term>
<term>Spin wave approximation</term>
<term>Spin waves</term>
<term>Spontaneous magnetization</term>
<term>Thickness</term>
<term>Ultrahigh vacuum</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Haute température</term>
<term>Phénomène critique</term>
<term>Evaporation faisceau électronique</term>
<term>Ultravide</term>
<term>Propriété magnétique</term>
<term>Epaisseur</term>
<term>Aimantation spontanée</term>
<term>Multicouche magnétique</term>
<term>Nickel</term>
<term>Or</term>
<term>Argent</term>
<term>Cuivre</term>
<term>Approximation onde spin</term>
<term>Interaction échange</term>
<term>Onde spin</term>
<term>Développement série</term>
<term>7570C</term>
<term>7510</term>
<term>8130B</term>
<term>7550C</term>
<term>8115H</term>
<term>7530E</term>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Nickel</term>
<term>Or</term>
<term>Argent</term>
<term>Cuivre</term>
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<front><div type="abstract" xml:lang="en">Ni/NM multilayers (with noble metal NM = Au, Ag and Cu) were prepared by the electron beam evaporation method under ultra high vacuum conditions. The magnetic properties of Ni/NM multilayers are examined as a function of Ni layer thickness t<sub>Ni</sub>
. The temperature dependence of the spontaneous magnetization M(T) is well described by a T<sup>3/2</sup>
 law in all multilayers. A spin-wave theory has been used to explain the temperature dependence of the magnetization and the approximate values for the bulk Exchange interaction J<sub>b</sub>
 and surface exchange interaction J<sub>s</sub>
 for various Ni layer thicknesses have been obtained. In the other hand we have used the high-temperature series expansion technique, to analyze the phase transition and the critical phenomena of a ferromagnetic a two-component multilayer, through three models: Ising, XY and Heisenberg. The critical reduced temperature τ<sub>c</sub>
(ν) is studied as function of the thickness of constituents in the unit cell of the multilayer. In the two-component multilayer τ<sub>c</sub>
(ν) is studied as function of the exchange interaction in each material and within the interface J<sub>s</sub>
, J<sub>b</sub>
 and J⊥, respectively. A critical value of the surface exchange interaction in the film and interface exchange interaction in the multilayer above which the surface and the interface magnetism appears is obtained. The dependence of the reduced critical temperature on the thickness of the film and the unit cell of multilayer has been investigated. The effects of an amorphous magnetic surface on the critical properties of the film of simple cubic lattice have been studied. A number of characteristic behaviors, such as the possibility of the existence of a critical length of the unit cell thickness at which the temperature of the multilayer remains insensitive to the exchange coupling within interface, are reported. In a defined range of the exchange interactions, the values of γ are comparable to the universal ones and are independent of the film thickness. The asymmetry of the structure and the competition of the effects of the exchange coupling are important for the magnetic properties of the system.</div>
</front>
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<name sortKey="Benyoussef, A" sort="Benyoussef, A" uniqKey="Benyoussef A" first="A." last="Benyoussef">A. Benyoussef</name>
<name sortKey="Benyoussef, A" sort="Benyoussef, A" uniqKey="Benyoussef A" first="A." last="Benyoussef">A. Benyoussef</name>
<name sortKey="Benyoussef, A" sort="Benyoussef, A" uniqKey="Benyoussef A" first="A." last="Benyoussef">A. Benyoussef</name>
<name sortKey="Hamedoun, M" sort="Hamedoun, M" uniqKey="Hamedoun M" first="M." last="Hamedoun">M. Hamedoun</name>
<name sortKey="Hamedoun, M" sort="Hamedoun, M" uniqKey="Hamedoun M" first="M." last="Hamedoun">M. Hamedoun</name>
<name sortKey="Lassri, H" sort="Lassri, H" uniqKey="Lassri H" first="H." last="Lassri">H. Lassri</name>
</country>
</tree>
</affiliations>
</record>

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Experiment and Theoretical Study of Critical Behavior in Magnetic Multilayers

Experiment and Theoretical Study of Critical Behavior in Magnetic Multilayers

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri