Magnetic Properties of Nano-Heterogeneous Amorphous Thin Films
Final rept. 1 Jun 1988-31 May 1991,
TEXAS UNIV AT AUSTIN DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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We report continued progress in understanding the nanostructure-magnetic property relationships in sputtered, amorphous, thin films. This research has been concentrated on two categories of sputtered magnetic thin films 1 magnetically soft films, of cobalt-based, binary cobalt-metalloid alloys with in plane anisotropies, and 2 magnetically hard, binary rare earth metal-transition metal alloy films with perpendicular anisotropies. Major research results obtained include 1 development of the first broadband measurement technique and apparatus for determining the complex permeability spectra of magnetic thin films in the 100KHz-200MHz frequency range 2 processing of magnetically soft amorphous thin films with the highest values of RF permeabilities ever reported in the literature 3 discovery of a new class of ultrasoft magnetic thin films with coercivities less than 0.1 Oe and completely reversible bias susceptibilities 4 systematically studied the microstructure, magnetic and magneto-optic properties of Tb-Fe and Gd-Co compositionally modulated films 4 demonstrated that substrate bias could be used to increase the oxidation resistance and improve the magnetic and magnetooptical properties of sputtered Tb-Fe CMFs and 5 developed a model of displacement eddy currents to resolve a long standing mystery about the origin of eddy current losses in magnetic recording head laminates.
- Metallurgy and Metallography