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Differential resistance as a function of perpendicular-to-plane applied field at zero current [(a) and (b)] and dc bias current for zero net external field, (c) for a 45 nm diameter nanopillar measured at room temperature.
Sum of the differential resistances measured while sweeping the dc bias current from to −1 mA and from −1 to . To eliminate Joule and Peltier effects [see Fig. 1(c)] the parabolic background signal was subtracted.
Field variation in the switching currents at 300 K (open symbols) and 20 K (solid symbols). Squares and circles correspond to transitions and reversals , respectively.
Properties for nanopillar 1 (studied in the present letter) and nanopillar 2 from Ref. 10: is the free layer volume, its coercive field, and is the critical current for reversal of the free layer.
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