Anomalous photon energy and field dependencies of the Faraday rotation in ZnMnSe under high magnetic fields

Abstract

Pulsed-field measurements of the Faraday rotation (FR) spectra over a wide photon energy range for (x = 0.015) were made up to 150 T at low temperatures by means of a streak spectrometer. We observed a reversal of the direction of the FR with increasing field. Dividing the Verdet constant into a paramagnetic term in the low-field range and a diamagnetic term in the high-field part, we found that the latter exhibits anomalies at around 2.4 eV.

Polymer-Coated Magnetic Nanoparticles as Ultrahigh Verdet Constant Materials: Correlation of Nanoparticle Size with Magnetic and Magneto-Optical Properties

“…23 Semiconductor-type MO materials tend to have much higher Verdet constants (10 4 −10 5 °/T•m) but are typically fabricated as ultrathin films and measured under cryogenic conditions. 24,25 Metallic glassy alloys have produced some of the highest Verdet constant materials reported to date (1.2 to 4.9 × 10 7 °/T•m) but can only be fabricated as ultrathin films. 26 To address these material challenges, the synthesis of organic molecular and polymeric materials has been explored as a low-cost and alternative to TGG with improved solution or melt processability.…”

“…Magnetic nanoparticle glasses have been explored previously by Yu et al, which resulted in modest Verdet constants (2.8 × 10 2 °/T·m) . Semiconductor-type MO materials tend to have much higher Verdet constants (10 4 –10 5 °/T·m) but are typically fabricated as ultrathin films and measured under cryogenic conditions. , Metallic glassy alloys have produced some of the highest Verdet constant materials reported to date (1.2 to 4.9 × 10 7 °/T·m) but can only be fabricated as ultrathin films …”