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Spin transfer torque induced magnetization dynamics.
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Nanopillars containing magnetic multilayers, either spin valves of magnetic tunnel junctions, are being researched thoroughly recently because of the applicability of these spin transfer torque devices both as current switched magnetic RAM bits and as oscillating elements in wireless communication technologies. Spin transfer torque, the transfer of spin momentum from a spin-polarized current to a magnetic layer, induces a torque on the magnetic moment of that layer. Provided enough torque is present, the magnetization of the magnetic layer can be switched or a stable GHz precession induced. Spin torque based nanoscale rf-oscillators are very appealing because of the expected efficiency and possibility to scale such devices. Furthermore, these oscillators would be tunable by current and external magnetic field. Spin transfer induced oscillations in spin valves have been clearly shown, however, in nanopillars based on MgO tunnel junctions, in theory the ideal system due to high MR and efficient polarization, there are only a limited amount of results. In this PhD the dynamics induced in tunnel juntion nanopillars by spin torque are being investigated.
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Project number:
3E080155
Duration of the project:
01.01.2008 - 31.12.2011
Funded research
Nederlands
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