OPTICAL AND MAGNETIC STUDIES OF NDFEB FILMS

The optical, electrical, and magnetic properties of magnetic Nd15Fe77B8 and nonmagnetic Nd5Fe62B33 films have been investigated. It has been found that within the visible (wavelengths 4400-6400 angstrom) the films are transparent with thickness less than 800 angstrom for magnetic films and 1500 angstrom for nonmagnetic films. This is due to the difference of the magnetic permeability mu between films. The oscillatory behavior with thickness of the films is observed in the film samples. The anomalous behaviors near the Curie temperature for both bulk- and film-type samples are similar to that of the type-III ferrfomagnets. The temperature at which the electrical resistance of the film-type samples increases abruptly varies from 620 K for 1000 angstrom to 650 K for 2000 angstrom.