CobaltMaghrebV1, Maroc, Analysis, bibRecord, 000017

Effect of the applied magnetic field and the layer thickness on the magnon properties in bilayers Co/Pt and symmetrical trilayer Pt/Co/Pt

Identifieur interne : 000017 ( Maroc/Analysis ); précédent : 000016; suivant : 000018

Effect of the applied magnetic field and the layer thickness on the magnon properties in bilayers Co/Pt and symmetrical trilayer Pt/Co/Pt

Auteurs : M. Mehdioui [Maroc] ; A. Fahmi [Maroc] ; H. Lassri [Maroc] ; M. Fahoume [Maroc] ; A. Qachaou [Maroc]

Source :

Journal of magnetism and magnetic materials [ 0304-8853 ] ; 2014.

RBID : Pascal:14-0108075

Descripteurs français

Pascal (Inist)
- Effet champ magnétique, Magnon, Magnon surface, Onde spin, Modèle Heisenberg, Hamiltonien spin, Anisotropie, Interaction échange, Interaction dipolaire, Spectre excitation, Sous bande, Bicouche, Multicouche, Platine, Cobalt, Métal transition.
Wicri :
- topic : Platine, Cobalt.

English descriptors

KwdEn :
- Anisotropy, Bilayers, Cobalt, Dipole interactions, Exchange interactions, Excitation spectrum, Heisenberg model, Magnetic field effects, Magnons, Multilayers, Platinum, Spin Hamiltonians, Spin waves, Subband, Surface magnons, Transition elements.

Abstract

We have studied the elementary magnetic excitations and their dynamics in multilayer Co(t Co)/Pt(t Pt) and Pt(f Pt)/Co(t Co)/Pt(t Pt) under an applied magnetic field. The Heisenberg hamiltonian used takes into account the magneto-crystalline and surface anisotropies, the exchange and dipolar interactions. The calculated excitation spectrum ε_N(k) presents a structure with two sub-bands corresponding to the magnons of surface and volume respectively. The existence of a gap of creating these magnons is also highlighted. The lifetimes deduced from these gaps are in good agreement with the results of previous studies. The thermal evolution of the magnetization m_z indicates that the system undergoes a dimensional crossover 3D-2D when the temperature increases. The calculated and measured magnetizations are compared and they are in good agreement. The exchange integral and critical temperature values deduced from these adjustments are in very good agreement with the results of previous works.

Affiliations:

Maroc

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Pascal:14-0108075

Le document en format XML

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<term>Interaction échange</term>
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<term>Spectre excitation</term>
<term>Sous bande</term>
<term>Bicouche</term>
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<term>Cobalt</term>
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<front><div type="abstract" xml:lang="en">We have studied the elementary magnetic excitations and their dynamics in multilayer Co(t Co)/Pt(t Pt) and Pt(f Pt)/Co(t Co)/Pt(t Pt) under an applied magnetic field. The Heisenberg hamiltonian used takes into account the magneto-crystalline and surface anisotropies, the exchange and dipolar interactions. The calculated excitation spectrum ε<sub>N</sub>
(k) presents a structure with two sub-bands corresponding to the magnons of surface and volume respectively. The existence of a gap of creating these magnons is also highlighted. The lifetimes deduced from these gaps are in good agreement with the results of previous studies. The thermal evolution of the magnetization m<sub>z</sub>
 indicates that the system undergoes a dimensional crossover 3D-2D when the temperature increases. The calculated and measured magnetizations are compared and they are in good agreement. The exchange integral and critical temperature values deduced from these adjustments are in very good agreement with the results of previous works.</div>
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Effect of the applied magnetic field and the layer thickness on the magnon properties in bilayers Co/Pt and symmetrical trilayer Pt/Co/Pt

Effect of the applied magnetic field and the layer thickness on the magnon properties in bilayers Co/Pt and symmetrical trilayer Pt/Co/Pt

Source :

Descripteurs français

English descriptors

Abstract

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

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Le document en format XML

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