Ultrafast switching of a nanomagnet by a combined out-of-plane and in-plane polarized spin current pulse
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Switching probability as the function of pulse amplitude for 100 ps, 600 ps, and 6 ns pulse widths . [(a) and (b)] Results for the CSV for (a) AP-P and (b) P-AP reversal. Inset: Schematic of the CSV device. [(c) and (d)] Results for the OPSV for the signs of current which give switching in conventional ST devices: (c) AP-P and (d) P-AP. Inset: Schematic of the OPSV device. [(e) and (f)] Results for the OPSV with the signs of current opposite to those needed for switching in conventional ST devices: (e) P-AP and (f) AP-P. Inset: Micromagnetic simulation of the configurations for the initial AP state. Color scale: Out-of-plane component of the normalized magnetization .
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Comparison of the reversal speed between the OPSV and CSV devices. The inverse of pulse widths is plotted as the function of the pulse amplitude that yields a 95% switching probability for: (a) P to AP and (b) AP to P reversals. For the OPSV device, pulse widths between 0.3 and 2 ns do not achieve 95% AP-P switching for any negative value of . Insets: The difference between the pulse current amplitudes that yield and as a function of for (a) P-AP and (b) AP-P. Large values of indicate a significant effect of thermal fluctuations on the reversal process.
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