MAGNONS HEAT TRANSPORT AT AN INTEGRATED NANOSTRUCTURE IN ULTRATHIN HEISENBERG FERROMAGNETIC FILMS

Mehand Belhadi () and Sedik Kheffache ()
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Mehand Belhadi: Laboratoire de Physique et Chimie des Matériaux (LPCM), Université Mouloud Mammeri, BP N° 17 RP, 15000 Tizi-Ouzou, Algérie
Sedik Kheffache: Laboratoire de Physique et Chimie des Matériaux (LPCM), Université Mouloud Mammeri, BP N° 17 RP, 15000 Tizi-Ouzou, Algérie

Surface Review and Letters (SRL), 2011, vol. 18, issue 06, 241-248

Abstract: A theoretical model is presented for the study of magnons heat transfer across an integrated nanostructure acting as interface material between two ultrathin Heisenberg ferromagnetic films. This is done by calculating the transmission rates of the spin wave modes through the consideration of the magnon group velocity modification in the system. The group velocities are calculated explicitly for all propagating frequencies and spin wave incidence angles. The matching method is used with nearest neighbor ferromagnetic interactions to calculate the coherent transmission coefficients for magnons incident on the nanostructure boundaries. They are investigated for different nanostructure thickness over the entire propagating frequency range of the system, in order to calculate the heat transport across the nanostructure. The model is applied to a system of three Iron ferromagnetic atomic layers and Gadolinium integrated nanostructure. The thermal conductivities are numerically calculated for individual magnon modes of the system. The results yield an understanding of the relationship between the magnons thermal conductivity of the system and the structural configuration of the integrated nanostructure.

Keywords: Spin waves; magnetic properties of thin films; transport properties (search for similar items in EconPapers)
Date: 2011
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DOI: 10.1142/S0218625X1101459X

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