Ellipsometric and Kerr-effect studies ofPt3−X(X=Mn

Abstract

The conductivity tensor of polycrystalline Pt 3 X (XϭMn, Co) was determined between 1.6 and 5.2 eV. Samples were arc melted, mechanically polished, and annealed at 500°C for 1 h in Ar. The complex dielectric function was measured from 1.3 to 5.2 eV at room temperature with a rotating analyzer ellipsometer. The magneto-optic Kerr effect was studied between 10 and 293 K in magnetic fields up to 3 T. We used the tight-binding linear-muffin-tin-orbital method in the local spin-density approximation to determine the band structure, density of states, and optical conductivity. Including an empirical quasiparticle self-energy and a lifetime broadening yields good agreement of experimental and calculated spectra. ͓S0163-1829͑98͒07625-5͔ II. EXPERIMENT A. Sample preparation and characterizationPt 3 X samples were arc-melted under an Ar atmosphere. Before arc-melting the chamber is purged to 20 mT and backfilled with ultra-high-purity argon ͑99.9995%͒ to about 0.75 atm five times. A Zr button is used to getter the atmosphere during the arc-melting process. After a homogeniza-

Femtosecond Spectrotemporal Magneto-optics

“…We used this technique for studying the spectral and temporal dependence of the MO contrast in a CoPt 3 sample. The results show that a slight spectral dependence is present in the static MO response as already demonstrated in previous studies [26,27]. On the contrary, the dynamical behavior of the relative variations of rotation and ellipticity are identical and do not show any spectral dependency.…”

Structure and magneto-optical properties of (CoPt 3 ) 1−x Ni x alloy films

“…With the photon energy increasing, the value of Kerr rotation angle first increases 2 − 3 times and then decreases which means (CoPt 3 ) 1−x Ni x alloy films are more suitable for the shortwave range from 3.5 eV to 5 eV than other wave ranges recording. The peak at 4.1 eV was also found in Lange's experiment [12] and the peak position was in good agreement with his TB-LMTO calculation although the Kerr rotation angle value in Fig. 4 is slightly lower than his corresponding result [12].…”

“…The peak at 4.1 eV was also found in Lange's experiment [12] and the peak position was in good agreement with his TB-LMTO calculation although the Kerr rotation angle value in Fig. 4 is slightly lower than his corresponding result [12]. Concerning the 4.1 eV peak, except for the contribution of Co atoms, it may be correlated with Pt 5d band because a peak has been found at about 4.1 eV in the Pt 5d photon energy spectra [13].…”

Magneto-optic spectrum and electronic structure of single-crystal MnBi

“…Kerr-magneto-optic spectra were measured on a spectrometer described elsewhere [23,24]. MnBi saturates magnetically in the 0001 direction at around 0.3 T at 300 K [25], where the measurements were taken.…”