title: Terahertz magnetic circular dichroism induced by exchange resonance in CoCr₂O₄ single crystal.
abstract: Terahertz (THz) time domain spectroscopy (THz-TDS) of a CoCr₂O₄ single crystal has been performed under magnetic fields up to 8 Tesla. The magnetic field dependences of inter-sublattice exchange resonance at different temperatures have been investigated. Benefiting from the phase and polarization sensitive detection technique in THz-TDS, the circular absorption dichroism and Faraday ellipticity in the THz frequency region are observed and are found to be tunable by the external magnetic field. The complex indices of refraction are obtained under different magnetic field, which present distinct rotatory dispersions arising from the exchange magnetic resonance.
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
authors.forename: Fuhai
authors.initials: F
authors.lastname: Su
authors.forename: Shile
authors.initials: S
authors.lastname: Zhang
authors.forename: Hongying
authors.initials: H
authors.lastname: Mei
authors.forename: Chao
authors.initials: C
authors.lastname: Zhang
authors.forename: Xuan
authors.initials: X
authors.lastname: Luo
authors.forename: Jianming
authors.initials: J
authors.lastname: Dai
authors.forename: Li
authors.initials: L
authors.lastname: Pi