1. For a review, see E. Kneller in “Magnetism and Metallurgy,” eds. A. E. Berkowitz and E. Kneller (Academic Press, 1969), Vol. 1, Chap. 8.
2. A.E. Berkowitz, R.P. Goehner, E.L. Hall and P.J. Flanders, J. Appl. Phys. 57, 3928 (1985).
3. A.E. Berkowitz, E.L. Hall and P.J. Flanders, IEEE Trans. Magn. 23, 3816 (1987).
4. E.L. Hall and A.E. Berkowitz, J. Mater. Res. 1, 836 (1986).
5. J.E. Knowles, IEEE Trans. Magn. 17, 3008 (1981).