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TUT: Tutorials

TUT 4: Tutorial: Spindynamics and Spintransport (MA)

TUT 4.2: Tutorial

Sunday, March 10, 2013, 17:00–18:00, H10

Spindynamics and Spintransport — •Alina Deac — Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany

The second part of the tutorial will discuss how spin-polarized currents can be used to excite magnetization dynamics and what applications can be envisioned. The spin-transfer torque arises from a transfer of angular momentum between the spin-polarized current and the magnetization and is sufficiently large to induce either reversal or steady-state precession. Magnetization switching via the spin-transfer torque effect relies on a constant current density, and thus the total current and the power consumption scale down with the lateral size of the device, thereby fulfilling the requirements for Green-Information-Communication Technology components. Spin-transfer driven precession generates output signals with GHz frequencies, which can be tuned by changing the applied current. Based on this effect, efficient frequency-tuneable microwave sources and resonators, nanometer scale transmitters and receivers, signal mixers and signal amplifiers can be designed. These devices could be used for mobile phone applications, on-chip communication, smart cards or even for microwave-assisted recording for hard-disk write heads.