1. R. C. LeCraw, Internagnetics Conference, Stuttgart, Germany, 1966 (unpublished). Text available from R. C. LeCraw, Bell Telephone Laboratories, Murray Hill, New Jersey.
2. D. L. Wood and J. P. Remeika, J. Appl. Phys.37, 1232 (1966);38, 1038 (1967).
3. S. H. Wemple, S. L. Blank, J. A. Seman, and W. L. Biolsi (to be published).
4. See, for example, S. H. Wemple and M. DiDomenico, Jr., Applied Solid State Science,3, 264 (1972).
5. See, for example, R. S. Tebble and D. J. Craik,Magnetic Materials, Wiley-Interscience, New York (1969).