Large magneto-optical effect in an oxide diluted magnetic semiconductor Zn1−xCoxO
- 30 April 2001
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 78 (18) , 2700-2702
- https://doi.org/10.1063/1.1368375
Abstract
Strong magneto-optical effect of Zn1−xCoxO near the optical band gap is reported. Magnetic circular dichroism (MCD) and Faraday rotation of Zn1−xCoxO (x=0.012 and 0.016) at 5 K are as high as 2°/cm Oe at 3.4 eV, which are about two orders larger than those of ZnO. Absence of strong Co2+ d–d* transition near the optical band gap makes Zn1−xCoxO an useful material for short-wavelength magneto-optical applications. Large magneto-optical effects and paramagnetic temperature dependence of MCD show a strong mixing of the sp bands of the host ZnO with Co2+ d orbitals. The polarity of the MCD peak is negative indicating the antiferromagnetic p–d exchange interaction.Keywords
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