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Ab initio study of GdCo5 magnetic and magneto-optical properties

Mahdi M., Djabri A., Koc M. M., Boukhalfa R., Erkovan M., Chumakov Yu., Chemam F.

Materials Science Poland

2019

Vol. 37, No. 2

182--189

The full potential linearized augmented plane wave method (FLAPW) including the spin-orbit coupling has been used to study the structural, electronic and magnetic properties of GdCo5 compound. The calculations were performed within the local spin density approximation (LSDA) as well as Coulomb corrected LSDA + U approach. The study revealed that the LSDA + U method gave a better representation of the band structure, density of states and magnetic moments than LSDA. It was found that the spin magnetic moment of Co (2c) and Co (3g) atoms in the studied compound is smaller compared to the one in bulk Co. The optical and magneto-optical properties and the magneto-optical Kerr effect have also been investigated.

Spectral dependence of magnetooptical Kerr effect in EuS-based ferromagnetic semiconductor multilayers

Szot M., Kowalczyk L., Smajek E., Volobuev V. V., Sipatov A. Y., Story T.

Materials Science Poland

2008

Vol. 26, No. 4

1033--1037

The magnetooptical Kerr effect (MOKE) magnetometry was used to study the magnetic hysteresis loops of EuS-PbS and EuS-SrS semiconductor epitaxial multilayers composed of ferromagnetic layers of EuS and nonmagnetic ultrathin spacer layers of PbS or SrS. The spectral dependence of the MOKE in EuS-based semiconductor multilayers was studied in the photon energy range covering the fundamental interband electronic transitions in EuS. The measurements of the longitudinal MOKE established two maxima on the spectral dependence of the Kerr rotation for the photon energy hν = 1.65 eV and hν = 2.1 eV. This experimental finding is explained based on the model of the electronic band structure of EuS. The observed maxima of the Kerr rotation correspond to the electronic transitions from the localized 4f levels of Eu2+ ions and from 3p valence band to the 5d-6s conduction band of EuS. Spectral dependence of magnetooptical Kerr effect in EuS-based ferromagnetic semiconductor multilayers.

Magnetometry of monoatomic layers and spin electronics elements

Wrona J., Stobiecki T., Czapkiewicz M., Rak R.

Materials Science

2003

Vol. 21, No. 1

55-63

In this paper, two magnetometers: resonance vibrating sample magnetometer (R-VSM) and magnetooptical Kerr effect magnetometer (MOKE) designed for hysteresis loop measurements of ultra-thin films and spintronics elements are described. Both instruments have been built by the first author of this paper in the Department of Electronics. The measuring head of R-VSM is universal and could work in the Helmholtz coils as well as in an electromagnet. The frequency of R-VSM is about 75 Hz. Test measurements on MgO(001)/Fe(4, 3, and 2ML)/50ACr samples were performed and the sensitivity was estimated as 10-5 emu. The MOKE system with differential amplifier (in contrast to lock-in detection technique) is especially recommended for rapid measurements up to 1.5 kHz. The calibration of the Kerr rotation angle was performed on the standard Fe sputtered films (with thickness from 2 nm to 50 nm) and Fe-wedge sample, prepared by MBE-technique, with the range of thickness from 1ML to 50 ML of Fe. On the base of measurement of 2, 3, 4, 5, 7 ML of Fe, the angle resolution of Kerr rotation was estimated as 0.001 min.