Oscillation of magnetoresistance in [Ni–Fe/Cu]20/Cu/Fe multilayers with thickness of Cu spacer neighboring Fe buffer layer

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Abstract
In [Ni–Fe (1.0 nm)/Cu(1.0 nm)]20/Cu(t nm)/Fe(5.0 nm) multilayers with giant magnetoresistance effects, oscillations of magnetoresistance ratio and preferred orientation depending on Cu spacer thickness t have been observed. Corresponding to the oscillation of the magnetoresistance ratio, the preferred orientation oscillates between <100≳ and <111≳, though the thicknesses of each Ni–Fe and Cu layer in the multilayer are fixed. Both the periods of the oscillations are about 0.6 nm. When the multilayers have stronger <100≳ and weaker <111≳ preferred orientations, they show higher magnetoresistance ratios.