Strong magneto-optical effects in ACr2O4 A=Fe, Co spinel oxides generated by tetrahedrally coordinated transition metal ions

Abstract

Magneto-optical effects have been investigated over the infrared{visible spectral range in ACr2O4 (A = Fe, Co) spinel oxides with non-collinear spin orders in their ground states. We found large magneto-optical Kerr rotation and ellipticity at the on-site d-d transitions of the A2+ ions located within the charge gap. The magneto-optical Kerr rotation of 12 deg observed in CoCr2O4 is unprecedentedly large among magnetic semiconductors and points towards the uniqueness of tetrahedrally coordinated Co2+ ions in generating a strong magneto-optical response. Criteria of strong magneto-optical effects emerging at on-site d-d transitions of transition metal ions are discussed.

arXiv commentFinal version, 9 pages, 6 figures

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Cited by in corpus (4)

• Electronic structure of the frustrated diamond lattice magnet NiRh${}_2$O${}_4$
• Giant magneto-optical Kerr enhancement from films on SiC due to the optical properties of the substrate
• Magnetic field dependent cycloidal rotation in pristine and Ge doped CoCr${}_2$O${}_4$
• Ultrafast selective mid-infrared sublattice manipulation in the ferrimagnet $FeC{r}_2{S}_4$