Ab initiomagneto-optical properties of bccNi∕Ni(100)

Terahertz radiation-induced conductivity, Kerr and Faraday angles, and spin textures in a two-dimensional electron gas with spin-orbit coupling subjected to a high magnetic field and periodic potential

“…The opposite sign of the Kerr angle compared to the Faraday angle which can be observed on the dominating part of the frequency range in Fig.4 can be explained by drawing the attention to the opposite signs in the expressions (17) and (19) reflecting the additional phase rotation during the reflection for the Kerr effect compared to the absorption for the Faraday effect, and the observation that both Reσ xy and Imσ xy have mainly constant signs in the frequency regions when they are both significantly non-zero with relatively small exceptions such as the region in Fig.3 discussed in detail above. It should be noted that the magnitude of both Faraday and Kerr angles shown Fig.4 is rather small compared, for example, with the ones for the interband transitions in ferromagnets or metaldoped semiconductors 17,18,20 while being comparable to the Faraday angle for strained GaAs or InGaAs nonmagnetic semiconductor structures, 14 , to the Kerr angle in some layered metal structures 19 or organic molecular semiconductors. 21 Nevertheless, it should be stressed that the frequency dependence of Faraday or Kerr rotation angles provide a quantitative experimental tool for investigation of such fragile and sophisticated spectrum as the miniband structure of a superlattice with SOC in high magnetic field.…”

“…The major part of the research in this field considered * Corresponding author. E-mail: khomitsky@phys.unn.ru the metal-based or magnetic semiconductor structures where the conductivity tensor and Kerr effect have been considered, [7][8][9][10][11][12][13][14][15][16][17][18][19][20] although the magnetooptical properties of the molecular semiconductors 21 and for the systems in the quantum Hall effect regime have also been studied. 22 Similar effects in non-magnetic semiconductor structures have also been explored, including the Faraday 14,23 and Kerr 24,25 effects as well as their properties in the presence of a significant SOC in two-dimensional electron gas (2DEG) 26 and the field-induced non-equilibrium spin density.…”

Ab Initio Optical Properties of Tribological/Engineering Surfaces

“…The ''plain'' 2 9 2 matrix technique has been previously developed and applied with success to determine Kerr rotation angles by one of the authors [3], within either a polar [4], longitudinal [5], or arbitrary geometry [6] at oblique incidence and in the case of several magnetic layered systems [7,8]. This technique has been shown to correctly describe all multiple reflections and optical interferences within a surfaced system and to exactly reproduce the well-known Fresnel relations in particular when one deals with semi-infinite bulk-like systems [9].…”

ROTMOKE: An assessment of macroscopic models for bcc Ni/Ni(100)

“…[1] In a previous paper [2] it has been shown that at least in the case of bcc Ni/Ni(100) the approximate expression of Kerr angles widely used by experimentalists to interpret ROTMOKE data, [3] completely agrees with our ab initio Kerr calculations performed by means of Luttinger's formalism using a contour integration [4] within the spin-polarized relativistic screened Korringa-Kohn-Rostoker (SKKR) method [5] and applying a 2 × 2 matrix technique, [6] which includes all multiple reflections and optical interferences. Furthermore, from our ab initio Kerr data, we concluded that the surface contributes up to 75% of the Kerr rotation angle, and hence the experimentally deduced magnetic properties cannot unambiguously be ascribed to bcc bulk Ni.…”

“…[2] were obtained by comparing the Kerr angles obtained via the 2 × 2 matrix technique with those arising from the two-media approach [7]. Besides providing further details of this comparison, in the present contribution macroscopic modeling of a layered system with a surface beyond the two-media approach will be suggested by investigating again the magneto-optical properties of bcc Ni/Ni(100) by means of a three-media approach, which contrary to the two-media approach also correctly accounts for the interface between the layered system and substrate.…”