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Etude des effets magneto-transverses dans les matériaux ferromagnétiques : effets Righi-Leduc planaire et anomal et géométrie Corbino.

Abstract : Abstract: During this PhD we studied different electric, thermal and thermoelectric properties. For instance, we characterized the anomalous and planar Righi-Leduc effects which are the thermal equivalent of the anomalous and planar Hall effects. These effect have to be taken into account when interpreting spin Seebeck measurements.We used the technics that we developped during this study to look at the Nernst effect in InSb. We developped, a carrier mobility distribution model to explain its non-linearity at fields around 1T.We built a ferromagnetic resonance experiment in order to study the impact of thermal and thermoelectric properties in spin pumping effect.Lastly, we studied electric transport in the Corbino geometry. Corbino geometry is the one of a disc where there are no free boundaries where electric charges can accumulate. This causes the apparition of an orthoradial Hall current which consequence is the increase of resistance of the disc.We showed an increase of resistance in the Corbino geometry in CoGd and CoTb originating from anomalous Hall effect. Despite the anomalous Hall effect does not dissipate, it produces an orthoradial current which dissipates. We also found in permalloy that this increase of resistance is counterbalanced by a decrease of resistance due to the anisotropic magnetoresistance.The similarity between anomalous Hall effect and spin Hall effect which share a common microscopic origin implies that we expect in platinum the apparition of an orthoradial spin current without possibility for the charges to accumulateition. This current should dissipate just the way it does for the anomalous Hall effect.The study of this spin current will be the topic of a futur study.
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Submitted on : Monday, November 6, 2017 - 10:36:08 PM
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Benjamin Madon. Etude des effets magneto-transverses dans les matériaux ferromagnétiques : effets Righi-Leduc planaire et anomal et géométrie Corbino.. Matière Condensée [cond-mat]. Université Paris Saclay (COmUE), 2017. Français. ⟨NNT : 2017SACLX029⟩. ⟨tel-01629899⟩

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