Stephen E. Russek, Shehzaad Kaka, Michael J. Donahue
High-speed dynamics, damping, and relaxation times in submicrometer spin-valve devices
Time domain detection of pulsed spin torque damping reduction (2009)
Ye, Longfei, Garzon, Samir, Webb, Richard A., Covington, Mark, Kaka, Shehzaad, Crawford, Thomas M.
Combining multiple ultrafast spin torque impulses with a 5 nanosecond duration pulse for damping reduction, we observe time-domain precession which evolves from an initial 1 ns duration transient...
Effect of resistance feedback on spin torque-induced switching of nanomagnets (2009)
Garzon, Samir, Webb, Richard A., Covington, Mark, Kaka, Shehzaad, Crawford, Thomas M.
In large magnetoresistance devices spin torque-induced changes in resistance can produce GHz current and voltage oscillations which can affect magnetization reversal. In addition, capacitive shunting...
Macrospin model of incubation delay due to the field-like spin transfer torque (2008)
Garzon, Samir, Bazaliy, Yaroslaw, Webb, Richard A., Crawford, Thomas M., Covington, Mark, Kaka, Shehzaad
We show that the absence of pre-switching oscillations ("incubation delay") in magnetic tunnel junctions can be explained within the macrospin model by a sizable field-like component of the...
Coherent control of nanomagnet dynamics via ultrafast spin torque pulses (2008)
Garzon, Samir, Ye, Longfei, Webb, Richard A., Crawford, Thomas M., Covington, Mark, Kaka, Shehzaad
The magnetization orientation of a nanoscale ferromagnet can be manipulated using an electric current via the spin transfer effect. Time domain measurements of nanopillar devices at low temperatures...
High-Speed Dynamics, Damping, and Relaxation Times in Submicrometer Spin-Valve Devices (2007)
Stephen Russek And, Stephen E. Russek, Shehzaad Kaka, Michael J. Donahue
The dynamical response of spin-valve devices with line widths of 0.8 m has been measured after excitation with 160 ps magnetic impulses. The devices show resonant frequencies of 2 to 4 GHz which...
Spin transfer switching of spin valve nanopillars using nanosecond pulsed currents (2004)
Kaka, Shehzaad, Pufall, Matthew, Rippard, William, Silva, Thomas, Russek, Stephen, Katine, Jordan, ...
Spin valve nanopillars are reversed via the mechanism of spin momentum transfer using current pulses applied perpendicular to the film plane of the device. The applied pulses were varied in amplitude...
Large-angle, gigahertz-rate random telegraph switching induced by spin-momentum transfer (2004)
Pufall, Matthew R., Rippard, William H., Kaka, Shehzaad, Russek, Steven E., Silva, Thomas J., Katine, Jordan, ...
We show that spin-polarized dc current passing through a small magnetic element induces two-state, random telegraph switching of the magnetization via the spin-momentum transfer effect. The...
Precessional and switching dynamics in micrometer dimension spinvalve devices / (2002)
Thesis (Ph. D.)--University of Colorado, 2002.