Simultaneous magnetoresistance measurements and observation of magnetic domain structures have been performed on active spin-valve elements by means of in situ experiments in a Lorentz transmission electron microscope. Two different spin-valve structures with NiFe and NiFe/Co sense layers have been studied with two sizes of rectangular elements. The effect of different applied current values has been analyzed and the addition of a Co layer in the sense layer has a large influence on the spin-valve behavior and on the domain structure. Also, two different processes for magnetic domain growth and motion have been observed for low or high applied current densities.
ASJC Scopus subject areas
- Physics and Astronomy(all)