An investigation of the low-temperature Faraday rotation spectrum of

Abstract

The Faraday rotation spectra between 1.5 eV and 2.4 eV are examined for thin films of the hexagonal ferrite , prepared by pulsed laser deposition. Fine spectral detail is observed at 24 K between 1.69 eV and 1.85 eV. A sharp paramagnetic transition at 1.69 eV, with an oscillator strength of , is assigned to the crystal field transition originating on the octahedrally coordinated site. Somewhat weaker diamagnetic transitions above 1.73 eV are tentatively assigned to first-excited-state transitions in the 2b trigonal bipyramidal site. A broader feature with an extremum at 2.23 eV is considered to originate from the transition in tetrahedral sites.

Magneto-photoluminescence spectroscopy of ZnMnTe/ZnMgTe spin superlattice

“…And considering that the wave function of electron is extended spatially and interacts with many Mn ions at the same time, the mean field approximation could be adopted. Therefore, the Hamiltonian of the sp-d exchange interaction could be expressed as [7][8][9] …”

Preparation and characterisation of magnetically ordered columnar structures of barium ferrite particles

“…Magnetically oriented barium ferrite films have several applications, such as highdensity magnetic recording [2], magneto-optical applications [3] and mm-wave applications [4]. For the last of these, barium ferrite-based compounds are irreplaceable [5].…”

Giant Faraday rotation spectra ofZn1−xMnxSeobserved in high magnetic fields

“…[14][15][16] In the low-field range, the FR spectra were measured over a wide range of x values as a function of temperature spanning the paramagnetic and the magnetically ordered phases. 1, 17 The spectral photon energy dependence was measured, but the field range was only up to a few T. Experiments with FR in DMS's have also been done at high magnetic fields over 100 T. 8,18 These experiments were performed by using monochromic light from a laser, so that the data taken through these experiments were only oscillatory signals with repeating bright and dark fringes. In the measurement using laser lines, it is not so easy to determine the sense of the rotation or a small change of the rotation.…”