Title :
Magneto-optic spectra of EuS-Gd and EuS-Tb films
Author :
Gambino, R.J. ; Fumagalli, P. ; Ruf, R.R. ; McGuire, T.R. ; Bojarczuk, N.
Author_Institution :
IBM Thomas J. Watson Res. Center, Yorktown Heights, NY, USA
fDate :
9/1/1992 12:00:00 AM
Abstract :
Doping EuS films with Tb or Gd increases the Curie point because of strong exchange through the free carriers and increases the coercivity because of strong crystal fields associated with vacant sulfur sites. The two main features of the reflectivity spectra of the doped samples are a strong free carrier contribution below 1.5 eV and a region of low reflectance between 1.5 and 4 eV. The Kerr peak in EuS at 2.4 eV is greatly enhanced in some of the doped compositions, probably as a consequence of low values of the optical functions n(ω) and k(ω) in this low-reflectance region
Keywords :
Curie temperature; Kerr magneto-optical effect; europium compounds; ferromagnetic properties of substances; gadolinium; infrared spectra of inorganic solids; magnetic semiconductors; magnetic thin films; reflectivity; terbium; visible spectra of inorganic solids; Curie point; EuS:Gd films; EuS:Tb films; Kerr peak; free carrier contribution; low reflectance; magnetic films; magneto-optic spectra; optical functions; reflectivity spectra; Coercive force; Doping; Magnetic field measurement; Magnetic materials; Magnetooptic effects; Optical films; Reflectivity; SQUID magnetometers; Temperature; Vibration measurement;
Journal_Title :
Magnetics, IEEE Transactions on
