Abstract
The asymmetric spin valve features a quiescent state in which the two ferromagnetic layers are antiparallel for any spacer thickness. It consists of AFM/FM/spacer/FM/AFM, where AFM is an antiferromagnet and FM is a ferromagnet. By cooling through the Néel temperature (TN) with a large current flowing, the FM layers are exchange biased in antiparallel directions. Current along is found to be sufficient to heat the device above TN. Devices with a 45 Å spacer layer were exchanged biased using a steady dc current which is turned down after T>TN; devices with thinner spacer layers (20 and 30 Å) were destroyed by a steady dc current due to excessive heating.
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