Magnetic and Magneto-optical Properties of Ni/Pt Multilayers with Perpendicular Magnetic Anisotropy at Room Temperature

Abstract

The magnetic and magneto-optical properties of NilPt multilayers exhibiting square Kerr hysterisis loops

at room temperature were studied. Squared polar Kerr hysterisis loops at room temperature in NilPt

multilayer thin films were obtained for the samples prepared by sequential dc magnetron sputter

deposition of nickel and platinum with t"i = 13 - 21 Å and tpt 3.5. 7.5 Å. The coercivity of these

multilayers was in the range of 400 • 1100 Oe. The saturation magnetization was found to show an inverse

dependence on nickel sublayer thickness. About a monolayer of Ni at interface was observed to behave

less magnetically than the interior lii atoms. The polar Kerr rotation exhibited an increasing trend with

decreasing wavelength in the spectral ran앙e of 7000-4000 A. 1he maximum of polar Kerr rotation was

found to shift to higher wavelengths with increase in nickel sublayer thickness.