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Enhanced magnetoresistance in lateral spin-valves
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic of a two terminal conventional spin-valve showing various feature definitions. , , and are kept fixed at , , and , respectively; (b) schematic of a nonlocal spin-valve, and (c) an SEM image of conventional spin-valve. The sharp features indicate precise dimensions of the pads delineated using GIS.

Image of FIG. 2.
FIG. 2.

(a) Measured magnetoresistance for a typical conventional spin-valve. The resistance is smaller for very large magnetic fields when both polarizer and analyzer are magnetized in the same direction, and larger when they are magnetized in opposite directions; (b) modulation of nonlocal spin-signal under an out of plane magnetic field due to spin precession (Hanle effect), which confirms electrical spin-injection and detection in these devices.

Image of FIG. 3.
FIG. 3.

Measured and simulated magnetoresistance for various source/drain extensions along the length and width of the device. (a) Peak magnetoresistance as a function of drain extension and for and at 10 K; (b) peak magnetoresistance vs and for and ; (c) peak magnetoresistance for varying and with , , and . Confined geometry leads to enhanced magnetoresistance.

Image of FIG. 4.
FIG. 4.

Measured and simulated magnetoresistance for various lengths of the analyzer contact pad. (a) Peak magnetoresistance for various and with , , and ; peak magnetoresistance for varying in confined geometry at (b) 10 K, (c) 50 K, (d) 180 and 250 K. Magnetoresistance reaches peak for .


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Scitation: Enhanced magnetoresistance in lateral spin-valves