TEMPERATURE-DEPENDENCE OF KERR ROTATION FOR NI FILM

We measured the temperature dependence of the Kerr rotation spectrum o f a Ni polycrystalline film. We observed an increment of 35% for the p olar Kerr rotation at 3.18 eV when the temperature was decreased from 300 to 84 K. This effect is much larger than the increment of 4% obser ved in the saturation magnetization over the same temperature range. T he experimental data at low-temperature are in excellent agreement wit h published ab initio calculations, whereas the variation of the Kerr rotations with temperature may be attributed to the rearrangement of e lectrons in the 3d bands.