Abstract
The detailed characteristics of magnetization switching in MgO-based magnetic tunnel junctions (MTJs) of diameters in the range of 21–57 nm with perpendicular magnetization are investigated by using pulses of durations in the range of 1–30 ns. Periodic fluctuations in the switching probability are observed at room temperature as a function of the biasing voltage. The period of the fluctuations is about 20–80 mV. The periods are in the same energy range as magnon excitations observed in tunnel spectroscopy. These fluctuations may also occur if there is a preferential trajectory in the free layer magnetization when it transverses the equator, as has been noted for in-plane magnetized MTJs. This kind of detailed observation of the switching probability may provide novel information about the switching dynamics.
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