THE PREPARATION AND CHARACTERISTICS OF THIN FERROMAGNETIC FILMS
Abstract
INVESIGATIONS INDICATE THAT THE THERMAL DECOMPOSITION OF ACETYLACETONATES IS NOT A FEASIBLE METHOD FOR PRODUCING Fe-Ni thin films because the Ni acetylacetonate decomposes and polymerizes, greatly reducing vapor pressure. Thin Fe films can be easily formed by this process. Thermal decomposition of carbonyl vapors of Ni and Fe produce magnetic Fe-Ni films which usually have high coercivity. However, annealing these films in wet H lowers the coercivity and produces films that can be used for computer elements. Some unusual effects, termed variable-threshold properties, were noted in films prepared by this method. The reproducibility of films having these properties is poor. Electrodeposition of thin magnetic films from aqueous solution of Ni and Fe sulfates proved to be the most useful and reproducile technique. Films having a thickness of 1000 Angstroms can be produced wih a coercive force of 2.2 oersteds, and an anisotropy field of 4 oersteds. These films, which switch in a rotatable mode under the influence of a drive field and cross field, were used successfully as computer memory elements. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1961
- Accession Number
- AD0275310
Entities
People
- Charles J. Kriessman
- Joseph S. Mathias
- Walter Freitag