Abstract
We have prepared Co86Tb14/Pt multilayers by r.f. sputtering and studied their magnetic and magneto-optical properties. As the Co–Tb layer thickness (tCoTb) decreases below 200Å the saturation magnetization increases, the rectangularity of the M–H loops and the coercivity decrease. The effective anisotropy Keff of the multilayers was determined by a torque magnetometer. The product Keff×tCoTb shows a linear dependence with tCoTb as normally found for the superlattices yielding the bulk and surface anisotropies of 1×106ergcm−3 and −0.2ergcm−2, respectively. These results are explained in terms of an interfacial Co–Pt layer. The polar Kerr rotation for the multilayers is found independent of layer thickness and is equal to 11.5min, which is higher than the single thick layer.
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