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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.

Articles you may be interested inGrowth modes of nanocrystalline Ni/Pt multilayers with deposition temperature J. Appl. Phys. 102, 043525 (2007); 10.1063/1.2769785 X-ray magnetic circular dichroic magnetometry on Ni/Pt multilayers

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We have prepared CoxNi1−x/Pt multilayers by evaporation under ultrahigh vacuum conditions and studied their magnetic and magneto-optical properties. The addition of Co to Ni leads to an increase in both the surface anisotropy and TC. It is found that the surface anisotropy Ks of CoxNi1−x/Pt multilayers can be expressed as the sum of Ks of Ni/Pt and of Co/Pt times their respective concentration. In Co0.3Ni0.7/Pt multilayers, for t(Co,Ni)=0.45 nm, one observes a perpendicular M-H loop with a good rectangularity and a coercivity of 1 kOe and TC of 180 °C. These characteristics are very interesting for application in magneto-optic storage.

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