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Quasistatic properties vs bias voltages. (a) Resistance vs easy axis field curves when a vanishing (black curve) or finite hard axis field is applied. [(b)–(f)] switching field astroids in constant positive (rectangles) or negative (circles) applied voltage. The gray astroids recall the 100 mV astroid. DOW stands for direct overwrite region.
Resistance fluctuations under 400 mV for hard axis fields of (a) 5.2 mT, (b) 6.1 mT, and (c) 6.8 mT. Note that the timescale is reduced by 100 from panel (a) to (c). Panel (d) plot of the square of the difference of the voltages of the two metastable states vs the square of the hard axis field, and linear fits using Eq. (2) for various voltages.
High frequency current noise (log scale) spectroscopy under 100 mV dc for hard (a) and easy (c) axis fields. [(c) and (d)] Deduced spin wave frequencies and corresponding fits.
Magnetic properties of the 2 nm thick free layer.
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