Magnetic LPE Crystalline Films for Small-Bubble-Diameter Cylindrical-Domain Memory Applications.
Abstract
The objective of the research was to develop a small-bubble-diameter garnet-crystalline magnetic film with useful device properties. Rare-earth iron garnet crystalline compositions were formulated, films deposited by liquid-phase epitaxy, and magnetic evaluation measurements performed. The results of the magnetic property experiments were used to select improve rare-earth iron garnet compositions and film deposition parameters for 2 micrometers or less bubble-diameter magnetic memory applications. Representative results of over 600 LPE film preparations and delivered samples are given in tabular form. Of the materials investigated, samarium thulium-, yttrium samarium thulium-, yttrium samarium lutetium-, and yttrium europium thulium gallium iron garnet were found to possess static bubble properties suitable for small bubble diameter applications. Yttrium samarium lutetium calcium germanium iron garnet small-bubble-diameter films were prepared and evaluated for comparison of their magnetic properties. In addition to the static magnetic property experiments, dynamic measurements were performed on (LaEuTm)3(FeGa)5O12, (SmTm)3(FeGa)5O12, (YSmLuCa)3(FeGe)5O12 and (YSmTm)3(FeGa)5O12. Mobilities of 233, 140, 1000 and 660 cm/sec/Oe, respectively, were determined for representative samples. It was concluded that these materials will be useful for small-bubble-diameter cylindrical-domain memory-device applications. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1977
- Accession Number
- ADA054272
Entities
People
- Alexander B. Smith
- M. Kestigian
- W. R. Bekebrede
Organizations
- Sperry Corporation