Heat assisted spin torque switching of quasistable nanomagnets across a vacuum gap

Herzog, G.; Krause, S.; Wiesendanger, R.
March 2010
Applied Physics Letters;3/8/2010, Vol. 96 Issue 10, p102505
Academic Journal
Current-induced magnetization switching of thermally quasistable magnetic nanoislands is demonstrated using a spin-polarized scanning tunneling microscope. The magnetization of an individual Fe nanoisland consisting of about 40 atoms on a W(110) surface is reversibly switched between two quasistable states by the application of spin-polarized tunnel current pulses without an applied magnetic field. The pulse length is shown to be crucial for a high switching efficiency. Sweeping the tunnel current from the nanoampere to the microampere regime allows for the determination of critical switching currents.


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