Abstract
The signal response in layered giant magnetoresistance (GMR) structures is studied in an external ac magnetic field at 50 Hz with an increasing amplitude swing. Co-Ag multilayers (MLs) were evaporated onto Si substrates. The thickness of Co and Ag layers was 1.2 nm and 5.5 nm, respectively. MLs with only N=2, 3, 4 periods were fabricated to expose the relative higher influence of top and bottom ferromagnetic Co layers of ML having a higher density of magnetic flux than the central layers. Experimental results are explained in terms of simulations of inhomogeneous magnetic field distribution in ML. Simulations were performed by an appropriate software tool. The results are of some relevance for the design and applications of smart magnetic GMR sensors.
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