DPG Phi
Verhandlungen
Verhandlungen
DPG

Dresden 2014 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

MA: Fachverband Magnetismus

MA 37: Spin Torque and Spin Excitations I

MA 37.10: Talk

Thursday, April 3, 2014, 12:00–12:15, HSZ 401

Spin torque switching of an in-plane magnetized system in a thermally activated regionTomohiro Taniguchi1, Yasuhiro Utsumi2, •Michael Marthaler3, Dmitri Golubev3, and Hiroshi Imamura11Spintronics Research Center, AIST, Tsukuba — 2Faculty of Engineering, Mie University, Tsu — 3Institut für Theoretische Festkörperphysik, KIT, Karlsruhe

The current dependence of the exponent of the spin torque switching rate of an in-plane magnetized system was investigated by solving the Fokker-Planck equation with low temperature and small damping and current approximations. We derived the analytical expressions of the critical currents, Ic and Ic*. At Ic, the initial state parallel to the easy axis becomes unstable, while at Ic* (≃ 1.27 Ic) the switching occurs without the thermal fluctuation. The current dependence of the exponent of the switching rate is well described by (1−I/Ic*)b, where the value of the exponent b is approximately unity for I < Ic, while b rapidly increases up to 2.2 with increasing current for Ic < I < Ic*. The linear dependence for I < Ic agrees with the other works, while the nonlinear dependence for Ic < I < Ic* was newly found by the present work. The nonlinear dependence is important for analysis of the experimental results, because most experiments are performed in the current region of Ic < I < Ic*.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2014 > Dresden