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Interfacial current-induced torques in Pt/Co/GdOx
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Micrograph of a 500-nm wide Pt/Co/GdOx strip and measurement schematic. With J < 0, the current is in the same direction as (and electron flow opposes) field-driven DW motion. (b) Hysteresis loops showing the DW propagation field changing and nucleation field invariant with injected DC current densities (J = − 0.61, 0, and +0.61 × 1011 A/m2). Note the breaks in the horizontal scale to show details. (c) Plot of the DW propagation field change ΔH prop against the injected DC current density in Pt/Co/GdOx, Pt/Co/Pt/GdOx, and Pt/Co/Pt strips (whose zero-current propagation fields are 170, 250, and 160 Oe, respectively).

Image of FIG. 2.
FIG. 2.

(a) Averaged DW transients probed at several positions at T sub = 324 K, H = 169 Oe, J = +1.05 × 1011 A/m2. The inset is a plot of average DW arrival time t 1/2 against probed position, with the linear fit indicating a uniform average velocity. (b) Purely field-driven DW velocity spanning more than 5 decades at T sub = 308 K. (c and d) DW velocity at several substrate temperatures versus applied field with J = 0 (c) and versus current density with H = 169 Oe (d). (e and f) Activation energy versus applied field (e) and versus current density. (f)

Image of FIG. 3.
FIG. 3.

(a) Averaged DW transients at three positions at T sub = 308 K, H = 130 Oe, J = −6.5 × 1011 A/m2. The inset is a plot of average DW arrival time t 1/2 against probed position, with the linear fit to extract the DW velocity. (b) DW velocity versus applied field at T sub = 308 K at several different current densities. (c) DW velocity plotted against effective magnetic field H eff = H + ɛJ.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Interfacial current-induced torques in Pt/Co/GdOx