Dielectric Constant and Magneto-Optical Kerr Rotation of Ferromagnetic Chromium Tribromide above the Absorption Band Edge
- 1 August 1965
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 36 (8), 2422-2426
- https://doi.org/10.1063/1.1714503
Abstract
By extending the optical and magneto‐optical measurements of the insulating ferromagnet CrBr3 (hexagonal layer structure, Tc=36°K, and 4πMs=3520 G) beyond the absorption band edge near 22 000 cm−1 with reflection techniques, three absorption bands representing the π and σ processes of electron transfer transitions and an internal transition of Cr3+ have been observed. The room‐temperature dielectric constant was measured by means of an ellipsometer. The σ process and the internal transitions give rise to the two absorption bands at 24 310 cm−1 and 29 580 cm−1 with oscillator strengths of 0.30 and 1.61, respectively. They account for most of the dielectric constant. While the π process is too weak to be resolved in the dielectric constant data, it accounts for the main peak of the normal incidence polar Kerr rotation at 1.5°K of 3.5° at 23 500 cm−1. The σ process accounts for the relatively sharp negative peak in the Kerr rotation of −2.5° at 26 700 cm−1. The data further suggest that the π process component of the off‐diagonal element of the electric polarizability tensor has opposite sign to the σ process and the internal transitions.Keywords
This publication has 12 references indexed in Scilit:
- Temperature Dependence of the Magneto-Optic Effect and Resonance Phenomena in Oriented MnBi FilmsJournal of Applied Physics, 1964
- Faraday Rotation of Rare-Earth Ions. I. TheoryPhysical Review B, 1964
- Der Zusammenhang zwischen dem magnetooptischen Kerr- und Faraday-Effekt und die optischen Konstanten von dicken Aufdampfschichten aus Eisen, Kobalt und NickelThe European Physical Journal A, 1963
- Magnetic Rotation of Visible Light by Ferromagnetic CrPhysical Review Letters, 1962
- On the Magnetic Properties of a CrBr3 Single CrystalJournal of the Physics Society Japan, 1960
- Interaction of Magnetic Crystals with Radiation in the Range 104–105 cm−1Journal of Applied Physics, 1960
- Optical Constants of Germanium: 3600 A to 7000 APhysical Review B, 1958
- Theory of the Faraday and Kerr Effects in FerromagneticsPhysical Review B, 1955
- Line Shapes in Nuclear ParamagnetismPhysical Review B, 1948
- Notes on magneto-opticsProceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1935