Thermally assisted spin transfer torque switching in synthetic free layers
arXiv:1010.5845 · doi:10.1103/PhysRevB.83.054432
Abstract
We studied the magnetization reversal rates of thermally assisted spin transfer torque switching in a ferromagnetically coupled synthetic free layer theoretically. By solving the Fokker-Planck equation, we obtained the analytical expression of the switching probability for both the weak and the strong coupling limit. We found that the thermal stability is proportional to Delta_{0}(1-I/I_{c})^{2}, not Delta_{0}(1-I/I_{c}) argued by Koch et al. [Phys. Rev. Lett. 92, 088302 (2004)], where I and I_{c} are the electric current and the critical current of spin transfer torque switching at absolute zero temperature. The difference in the exponent of (1-I/I_{c}) leads to a significant underestimation of the thermal stability Delta_{0}. We also found that fast switching is achieved by choosing the appropriate direction of the applied field.
References in corpus (2)
Cited by in corpus (10)
- Spin torque switching of an in-plane magnetized system in a thermally activated region
- Thermally-Assisted Spin-Transfer Torque Magnetization Reversal in Uniaxial Nanomagnets
- Fluctuation Theorem for a Small Engine and Magnetization Switching by Spin Torque
- Thermal effects in spintronic materials and devices: an experimentalist's guide
- Switching induced by spin Hall effect in an in-plane magnetized ferromagnet with the easy axis parallel to the current
- Stochastic spin-orbit-torque device as the STDP synapse for spiking neural networks
- Thermal Activation Barriers for Creation and Annihilation of Magnetic Droplet Solitons in the Presence of Spin Transfer Torque
- Exploring Spin Polarization of Heavy Quarks in Magnetic Fields and Hot Medium
- Theory of Spin Torque Assisted Thermal Switching of Single Free Layer
- Spin-transfer torque effects in the dynamic forced response of the magnetization of nanoscale ferromagnets in superimposed ac and dc bias fields in the presence of thermal agitation