Journal
JOURNAL OF SUPERCONDUCTIVITY
Volume 15, Issue 1, Pages 27-35Publisher
KLUWER ACADEMIC/PLENUM PUBL
DOI: 10.1023/A:1014071009340
Keywords
spin injection; spin accumulation; spin valve
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We study the electrical injection and detection of spin currents in a lateral spin valve device, using permalloy (Py) as ferromagnetic injecting and detecting electrodes and copper (Cu) as nonmagnetic metal. Our multiterminal geometry allows us to experimentally distinguish different magnetoresistance signals, being (1) the spin valve effect, (2) the anomalous magnetoresistance (AMR) effect, and (3) Hall effects. We find that the AMR contribution Of the Py contacts can be much larger than the amplitude of the spin valve effect, making it impossible to observe the spin valve effect in a conventional measurement geometry. However, these contact magnetoresistance signals can be used to monitor the magnetization reversal process, of the spin injecting and detecting Py contacts. In a nonlocal spin valve measurement we are able to completely isolate the spin valve signal and observe clear spin accumulation signals at T = 4.2 K as well as at room temperature. We obtain spin diffusion lengths in Cu. of 1 Am and 350 nm. at T = 4.2 K and room temperature respectively.
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