The existence of two types of magnon populations created in volume and in the surfaces of the Co Pt /P t multilayer x 1−x was demonstrated. A band structure of these magnons was evidenced by the shape of the calculated excitation spectra. Two bands of energy allowed for a creation of these magnetic excitations are obtained. “Creation gaps” and associated lifetimes are also calculated. The comparison of the calculated relaxation times with experimental results is more than satisfactory. Keywords Heisenberg spin Hamiltonian · Creation of magnons in surface and volume · Lifetimes and gaps of the creation of magnons · Energy bands allowed for magnons creation 1 Introduction within the surface from those of bulk. This difference depends on the relative values of the exchange integrals The multilayer alloys Co Pt /P t are characterized by at the surface and the volume. Moreover, the lifetime of x 1−x important properties such as a good chemical stability , these modes is different. Therefore, the excitation energy a high coercivity , an important Kerr rotation , and a and lifetime are tow important factors in magnon-based strong perpendicular anisotropy [4–6] which are factors of devices domain. We report in this article
Journal of Superconductivity and Novel Magnetism – Springer Journals
Published: Jun 5, 2018
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