Magnetic properties and domain structure studies in dc triode-sputtered permalloy/carbon multilayer films

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Abstract
Double-layer and multiple-layer thin films of permalloy with carbon as a intermediate nonmagnetic spacer were prepared by low-energy dc triode sputtering. Coupling between the two layers of the double films is investigated on a series of samples with a fixed thickness of permalloy layers (dp = 300 Å) and thickness of the carbon layer dc, varying from 0 to 25 Å. Thickness dc = 10 Å is found to be the limiting value for the carbon layer to be continuous and 20 Å for domain structures in the two magnetic films to decouple. Saturation magnetization Ms, uniaxial anisotropy field, Hk, and coercive force Hc of multilayers with dc = 10 Å and dp from 50 to 600 Å (number of magnetic layers from 12 down to 1) are measured and found consistent with earlier results by other authors. Multiple domain walls in the multilayers are investigated by Lorentz electron microscopy.

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