In this work we report on time resolved magnetization reversal driven by spin transfer torque in an orthogonal
spin transfer (OST) magnetic tunnel junction device. We focus on the transitions from parallel (P) to antiparallel
(AP) states and the reverse transitions (AP to P) under the influence of 10 ns voltage pulses. The electrical
response is monitored with a fast real-time oscilloscope and thus timing information of the reversal process
is obtained. The P to AP transition switching time decreases with increasing current and shows only direct
switching behavior. The AP to P transition shows similar behavior, but has a broader distribution of switching
times at high currents. The rare AP to P switching events that occur at later times are due to the occurrence of a
pre-oscillation, which could be identified in time resolve voltage traces. A possible origin of these pre-oscillations
is seen in micromagnetic simulations, where they are associated with the breakdown of the uniform precession
of the magnetization, and lead to reversal of the magnetization at later times.
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