Effets thermoélectriques anisotropes dans les couches minces ferromagnétiques Py et YIG

Abstract : This thesis is a study in the field of "Spin Caloritronics". This work focuses on the anisotropic magnetothermal transport in ferromagnetic thin film. The aim of this study is to determine the relationship between thermal transport and the magnetization state of the ferromagnetic thin layer. We show the experiments we used to do both electrical and thermal transport measurements. We also present a set of theoretical tools (model, calculation and simulation) which allows a better understanding of the experimental results. The first goal is to define the magnetization state of the sample by the measuring both the magnetoresistance and Hall effect (planar and anomalous). These measurements allow finding all the parameters necessary to the description of the magnetization equilibrium state so that we accurately know the magnetization state of our ferromagnetic thin film. The second goal is to find the angular dependence of thermal transport and to compare it with the angular dependence of electrical transport. To do so, we replace the electric current by a heat current end then do transverse voltage measurements for different angles. The results show that the measured voltage with a heat current has the same behavior as the transverse voltage measured with an electric current.
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Contributor : Do-Chung Pham <>
Submitted on : Tuesday, July 1, 2014 - 2:52:24 PM
Last modification on : Wednesday, March 27, 2019 - 4:26:01 PM

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Pham Do Chung. Effets thermoélectriques anisotropes dans les couches minces ferromagnétiques Py et YIG. Science des matériaux [cond-mat.mtrl-sci]. Ecole Polytechnique X, 2014. Français. ⟨pastel-01016941⟩

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