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(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.
(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.
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.
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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