Abstract
Size and heat treatment effects in magnetoresistive properties of Ag-added Ni80Fe20 film systems prepared by the method of electron-beam co-evaporation at room temperature were investigated. For all as-deposited samples, the isotropic magnetoresistance, which value increase with the growth of sample thickness within the range from 20 to 100 nm, was observed. The maximum magnetoresistance was observed for Ag-added Ni80Fe20 film systems with a total thickness of 60 nm annealed to 500 K. The high-temperature annealing to 700 K leads to a decrease in the value of magnetoresistance and appearing of the anisotropic magnetoresistive effect. Magnetic investigations of thin films allow indicating that nanosized permalloy grains have ferromagnetic nature and conditional the isotropic behavior of magnetoresistance in as-deposited samples.
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