ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Permanent magnetic materials based on iron, cobalt, and rare earths have been extensively studied during the past years. It is very interesting to study the physical properties of film type permanent magnet materials. In this investigation, we report the optical and magnetic properties of SmCo, SmFe, Sm, Co, and Fe films as well as the comparison of the electrical resistivity and magnetization behaviors between these films. The optical transmittance and reflectance have been measured as functions of the wavelength and the thickness for all the films with thickness less than 2000 A(ring). The electrical resistivity and magnetization have been measured below room temperature. The slope of electrical resistivity is decreased with decreasing the thickness of the films. The films are transparent with thickness less than 800 A(ring) for magnetic films. For films with thickness at 200 A(ring), the values of the transmittance are 50, 48, 38, 18, and 14 for Sm, SmCo, SmFe, Co, and Fe, respectively. This is explained due to the difference of the magnetic permeability of all the films. The oscillatory behaviors of reflection for all the films are qualitatively consistent with that of the theoretical predict for an absorbing surface. Up to now, the best magnetic properties for magnetic films at room temperature are with an intrinsic coercivity of 1450 Oe and an energy product of 4.5 MGOe. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.361992
