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Large magneto-optical effect in an oxide diluted magnetic semiconductor Zn1-xCoxO

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7 Author(s)
Ando, K. ; Electrotechnical Laboratory, Tsukuba, Ibaraki 305-8568, Japan ; Saito, H. ; Jin, Zhengwu ; Fukumura, T.
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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. © 2001 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:78 ,  Issue: 18 )

Date of Publication:

Apr 2001

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