Magnetization Dynamics and Spin Transfer Effect in Nanometric Spin Valves

Abstract : Ever since its prediction, spin transfer has spawned a lot of interest, and some applications have already been commercialized. However the spin transfer effect is still not fully understood. This thesis focused on magnetization dynamics and spin transfer effect in spin valves with out of plane magnetization, proven to be more efficient. With this in mind, we developped a software simulating magnetization dynamics in spin valve. We then confronted the software with experimental results to check our model and its hypotheses veracity. Another part of this thesis was to study current-field state diagrams, which offer a global perspective on magnetization behavior. We managed to show the applied field and the anisotropy could produce a symmetry breaking of the system and thus explain the experimental results. We were also able to highlight canted states of the magnetization. Those are frozen states of the magnetization for certain angles. The last part describes magnetization dynamics at different time scales from a second to a hundred picoseconds. We showed the macrospin model is not appropriate for short current pulses, although we could highlight the influence of some parameters. We finally the micromagnetics model allowed for a better description of the experimental results
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https://hal.univ-lorraine.fr/tel-01749237
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  • HAL Id : tel-01749237, version 1

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Christel Berthelot. Magnetization Dynamics and Spin Transfer Effect in Nanometric Spin Valves. Other [cond-mat.other]. Université de Lorraine, 2012. English. ⟨NNT : 2012LORR0076⟩. ⟨tel-01749237⟩

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