The combined effect of alloy and temperature on the transition from quantum to classical regime of the magnons excited in CoxPt1−x∕Pt

Ahmed Qachaou, Mohamed Mehdioui, Nadia Ait Labyad, Atika Fahmi, Mounir Fahoume, Mohamed Lharch and Mohamed Elharfaoui

Physica A: Statistical Mechanics and its Applications, 2019, vol. 515, issue C, 771-784

Abstract: We have shown that as the combined effect of alloy and temperature increases, the magnons created in the CoxPt1−x∕Pt multilayers undergo a transition in nature. From a purely quantum behavior at low temperature, these magnetic excitations acquire a behavior of the classical limit of localized particles (their associated wavelength is very low) at high temperature. The magnetization per spin calculated Mcalz(T,x) using an extended average number of particles forming the mixture of these two types of magnons created shows, indeed, a change of slope of the tangent to its curve at a temperature T=Tr(x). This would reflect a spin reorientation transition (SRT) from out-of-plane to in-plane observed experimentally in this type of materials. The comparison of Mcalz(T,x) with the experiment is indeed very satisfactory.

Keywords: Heisenberg spin Hamiltonian; Spin waves theory; Creation of magnons in surface and volume; Magnetization per spin; Spin reorientation transition (SRT) (search for similar items in EconPapers)
Date: 2019
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:515:y:2019:i:c:p:771-784

DOI: 10.1016/j.physa.2018.09.109

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