Optical and magneto-optical constants of MnPt3

Authors

K. W. Wierman, University of Nebraska-Lincoln
J. N. Hilfiker, University of Nebraska-Lincoln
R. F. Sabiryanov, University of Nebraska-Lincoln
Sitaram S. Jaswal, University of Nebraska-LincolnFollow
Roger D. Kirby, University of Nebraska-LincolnFollow
John A. Woollam, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

February 1997

Comments

Published in Physical Review B 55, 3093 (1997). Copyright 1997 American Physical Society. Used by permission.
http://0-prola.aps.org.library.unl.edu/pdf/PRB/v55/i5/p3093_1

Abstract

Optically thick films of MnPt₃ were deposited on quartz using dc magnetron sputtering. The films were covered with an SiO_x protective overcoat and annealed in vacuum at 850 °C for 1 h to form the crystalline L1₂ (Cu₃Au) cubic structure. These films have a high degree of long-range order and are highly textured with the (111) axis along the film normal. Variable angle spectroscopic ellipsometry measurements were taken over the spectral range of 1.2–4.2 eV to determine the optical constants of both MnPt₃ and the SiO_x overcoat. Spectroscopic magneto-optic Kerr rotation and ellipticity measurements at near normal incidence over the spectral range of 1.4–3.6 eV were used to determine the off-diagonal dielectric tensor elements for MnPt₃ . Firstprinciples electronic-structure calculations were carried out for the ordered MnPt₃ structure and from these the dielectric tensor elements of MnPt₃ were calculated. The experimental and theoretical values of the diagonal components of the dielectric tensor components are in good agreement. The agreement for the off-diagonal components of the dielectric tensor is only fair.[S0163-1829(97)04205-7]