Magnetic properties of Ni/Pt multilayers

Abstract

We have grown Ni/Pt multilayers (ML) with and without Pt buffer layer, by evaporation under UHV conditions on glass and Si substrates maintained at 30 and 200 °C. The magnetization decreases with t(Ni) and no induced moment is found on Pt from polarization effects even at 5 K. The perpendicular magnetization loops for samples with t(Ni)≤17 Å are rectangular and coercivities as high as 4.7 kOe is obtained for t(Ni)=9 Å at 5 K. For the samples deposited at 20 °C, due to dispersion in the results, KS could not be calculated with accuracy though it is positive. But for the samples deposited on a Pt buffer layer at 200 °C, KS is found to be +0.17 erg cm−2 at 5 K and the volume anisotropy is also higher with respect to those deposited at 30 °C.