We present the first measurements of giant magnetoresistance with current perpendicular to the layer planes (CPP-MR) of an exchange-biased spin-valve (EBSV) - a controllable spin-switch. Interpreted with the theory of Valet and Fert, data on EBSVs of permalloy (Py) with Cu yield an unexpectedly short spin-diffusion length in Py -lPysf = 5.5 ± 1 nm. Such a short length has implications for the interpretation of Johnson's data on a Py/Au/Py spin-switch.
- Giant magnetoresistance - CPP
- Spin-diffusion length