Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-12-18
Phys. Rev. Lett. 105, 047202 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
16 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.105.047202
Spin transfer torque from spin-polarized electrical current can excite large-amplitude magnetization dynamics in metallic ferromagnets of nanoscale dimensions. Since magnetic anisotropy energies of nanomagnets are comparable to the thermal energy scale, temperature can have a profound effect on the dynamics of a nanomagnet driven by spin transfer torque. Here we report the observation of unusual types of microwave-frequency nonlinear magnetization dynamics co-excited by alternating spin transfer torque and thermal fluctuations. In these dynamics, temperature amplifies the amplitude of GHz-range precession of magnetization and enables excitation of highly nonlinear dynamical states of magnetization by weak alternating spin transfer torque. We explain these thermally activated dynamics in terms of non-adiabatic stochastic resonance of magnetization driven by spin transfer torque. This type of magnetic stochastic resonance may find use in sensitive nanometer-scale microwave signal detectors.
Boone Carl T.
Cheng Xiao
Krivorotov Ilya N.
Zhu Jian
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