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Dependence of the resistance R on the external magnetic field H ext. The magnetic field was applied to the film normal. Inset: full cycle of the R–Hext curve. The free and reference layer coercivities are 1.3 and 6.0 kOe, respectively. The offset field originating from the dipole coupling between the free and reference layers is estimated to be −0.7 kOe.
(a) A schematic of the measurements setup. (b) Two-dimensional color map of the spin-transfer switching probability P sw from AP to P states as a function of the pulse current amplitude I and width t pulse under a field of Hext = −0.7 kOe to the film normal, which cancels the dipole coupling between the free and reference layers. Red (blue) represents a high (low) Psw. The black solid and dotted lines, respectively, show fits for P sw = 0.5 of Eq. (3) for I < I c0 and of Eq. (5) for I > I c0 with fitting parameters of Δ = 80, I c0 = 1.7 mA, and Ω = 1.7 GHz. Inset: the attempt time τ0 as a function of I.
Differential switching probability at P sw = 0.5 for an arbitrary current h and time t as a function of the normalized current h = I/I c0. Circles and triangles are the experimental results for dP sw/dh (h < 1) and dP sw/dt (h > 1), respectively. Solid and dotted lines are the results of Eq. (6) with Δ = 80, I c0 = 1.7 mA, and Ω = 1.7 GHz.
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