Abstract
An exchange coupling and thermal stability study in Fe(Pt)Mn/NiFe films has been investigated. When Pt atoms were added to an FeMn layer, most of the properties in the FeMn/NiFe films were improved. The resistivity increased with increasing Pt content. The exchange coupling field had a maximum value for a film with about 5–8 at. % Pt. Especially, it was found that the addition of Pt to the FeMn layer improved considerably the thermal stability of exchange coupling in the FeMn/NiFe films. In Fe39Pt6Mn55(7 nm)/NiFe(10 nm) films, an exchange coupling field of 100 Oe and a coercivity of 40 Oe were obtained after annealing at 300 °C. From the result of Auger analysis, it was found that diffusion of the interface was suppressed by Pt addition.
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