Interplay between oscillatory exchange coupling and coercivities in giant magnetoresistive [Ni80Fe20/Cu/Co/Cu] multilayers

摘要: We have observed giant magnetoresistance in [Ni80Fe20/Cu/Co/Cu] multilayers with well‐defined oscillations magnitude as a function of the Cu layer thickness both at 300 and 4.2 K. The phase period are found to be very similar those previously measured Co/Cu and, more recently, Ni81Fe19/Cu multilayers. However, existence strong contrast coercive fields between Ni80Fe20 Co leads significant for thicknesses where coupling is zero or even moderately ferromagnetic. At room temperature, resistance changes large 7% within few tens oersted field.