Abstract
Considerable interest has been created recently in the preparation and magnetic properties of rare earth(RE) −transition metal(TM) binary amorphous thin films. The specific binary systems of primary interest have been Gd−Co1 for its induced uniaxial anisotropy, Ku, and its associated properties which make it attractive for magnetic bubble and magneto−optic devices, and TbFe22 for its large coercivity, magnetostriction, energy product, and permanent magnet applications. In addition to their technological significance, their properties have resulted in the two prevailing, but contradicting, theories of magnetic exchange in amorphous systems, namely the local anisotropy3 and charge transfer4 models. This report presents the results of an investigation in which (1) we systematically studied the magnetic properties of Ho−Co and Ho−Fe amorphous thin films over a wide compositional range in order to judge the validity of the two theories, and (2) we measured the temperature dependence of Ku in Gd−Co, Ho−Co, and ...
Published Version
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