Dielectric tensor characterization and evaluation of several magneto‐optical recording media

We attempt to establish a dielectric tensor database for magneto‐optical (MO) thin film materials with potential application for blue recording. For this purpose a method is developed for measuring the dielectric tensor of the MO layer within a multilayered stack. It uses a combination of ellipsometric, reflection/transmission, and polar MO Kerr effect measurements, and employs the MULTILAYER computer program to analyze the data. Using this approach we have measured the dielectric tensor for thin films of BiDy3(FeGa)5O12 garnet, MnBi, multilayered Co/Pt, amorphous TbFeCoTa, and fcc cobalt in the wavelength range of 400–780 nm. The dielectric tensor for the Heusler alloy films of PtMnSb, which is available from the published literature, is also presented for the sake of completeness. These materials are then evaluated based on the intrinsic MO figure of merit defined by FOM≡‖exy‖/(2 Im exx), where exx and exy are the diagonal and off‐diagonal elements of the dielectric tensor of the MO material. In the blu...

[1]  M. Mansuripur.  Figure of merit for magneto‐optical media based on the dielectric tensor , 1986 .

[2]  Yongxian Wang,et al.  The properties of Al,Si-doped MnBi films , 1990 .

[3]  D. Chen,et al.  MnBi Films: High‐Temperature Phase Properties and Curie‐Point Writing Characteristics , 1970 .

[4]  F. McCrackin,et al.  Measurement of the Thickness and Refractive Index of Very Thin Films and the Optical Properties of Surfaces by Ellipsometry1 , 1963, Journal of research of the National Bureau of Standards. Section A, Physics and chemistry.

[5]  A. Saito,et al.  Domain Structure Change in Grain-Oriented Silicon Steel Sheets Due to Compressive Stress. , 1993 .

[6]  Peter Francis Carcia,et al.  Perpendicular magnetic anisotropy in Pd/Co thin film layered structures , 1985 .

[7]  Kimio Tatsuno,et al.  High-density SHG laser readout with Pt/Co MO disk , 1992, Other Conferences.

[8]  W. B. Zeper,et al.  Perpendicular magnetic anisotropy and magneto-optical Kerr effect of vapor-deposited Co/Pt-layered structures , 1989 .

[9]  E. Feldtkeller.  Suitability of MnBi and Mn1-xTixBi films for magnetooptic memories , 1972 .

[10]  P. Carcia.  Perpendicular magnetic anisotropy in Pd/Co and Pt/Co thin‐film layered structures , 1988 .

[11]  J. F. Ready,et al.  MnBi Thin Films: Physical Properties and Memory Applications , 1968 .

[12]  Nagaaki Koshino,et al.  Microstructure of sputtered garnet films for magneto‐optical recording media , 1988 .

[13]  M. Mansuripur,et al.  Measurement of reflectivities for magnetooptical media. , 1986, Applied optics.

[14]  M. Erman,et al.  PtMnSb, a material with very high magneto‐optical Kerr effect , 1983 .

[15]  R. D. Groot,et al.  Optical properties of some half-metallic ferromagnets , 1985 .

[16]  Ting C. Huang,et al.  Magnetic and magneto‐optic properties of Bi‐substituted garnet films crystallized by rapid thermal processing , 1990 .

[17]  Satoshi Iwata,et al.  Magnetic properties and microstructure in (Fe,Co)/Pt multilayer films , 1992, Other Conferences.

[18]  J. K. Erwin,et al.  Measuring the wavelength dependence of magnetooptical Kerr (or Faraday) rotation and ellipticity: a technique. , 1990, Applied optics.

[19]  D. Sellmyer,et al.  Magneto‐optical properties of MnBiAl thin films , 1991 .

[20]  Masud Mansuripur,et al.  The Physical Principles of Magneto-optical Recording , 1995 .

[21]  R. C. Weast.  CRC Handbook of Chemistry and Physics , 1973 .

[22]  D. Chen,et al.  MnBi films for magnetooptic recording , 1973 .

[23]  S. Hashimoto,et al.  Co/Pt and Co/Pd multilayers as magneto-optical recording materials , 1990 .

[24]  J. K. Erwin,et al.  Dielectric tensor characterization for magneto-optical recording media. , 1992, Applied optics.

[25]  Measurement of the magnetooptical constants of reactive metals. , 1983, Applied optics.

[26]  Masud Mansuripur,et al.  Analysis of multilayer thin-film structures containing magneto-optic and anisotropic media at oblique incidence using 2×2 matrices , 1990 .