The large spin transfer effects observed in spin-valve pillars developed for current perpendicular to plane (CPP) magnetoresistive heads were studied. Complex stacks including laminated free, synthetic/laminated pinned, and nano oxide layers were investigated. The magnetoresistive (MR) transfer curves were found to exhibit current dependent loop shift. Very large noise associated either to stochastic jump of the free layer magnetization or to excitations of steady precessional states was also found to exist in some particular ranges of current and field. The spin-transfer effect was shown to exhibit an asymmetry as a function of current direction.
ASJC Scopus subject areas
- Physics and Astronomy(all)