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25 March 2005 From spin diffusion to magnetization reversal: the four-channel approach
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Experiments of spin injection, from a normal metal to a ferromagnet, show that the magnetization of the ferromagnet can be switched with high current pulses, without the need of a magnetic field. In order to describe the experimental observations, two different kinds of electronic populations are defined for the transport: the spin polarized current inside the normal metal (paramagnetic spin-polarized current) and the spin-polarized current inside the ferromagnet (ferromagnetic spin polarization). The redistribution of the electronic populations is then investigated in the framework of a four-channel approach (up and down spin polarization for paramagnetic and ferromagnetic currents). This mechanism couples the electronic transport (Boltzmann equations to the dynamics of the magnetization (Landau-Lifshitz-Gilbert equation), and leads to define a magnetic temperature which depends on the current injection.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jean-Eric Wegrowe and Henri-Jean Drouhin "From spin diffusion to magnetization reversal: the four-channel approach", Proc. SPIE 5732, Quantum Sensing and Nanophotonic Devices II, (25 March 2005);


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