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Blueshifted Kerr effects and enhanced reflectivity in nanocrystalline CoFe2-xAlxO4 thin films

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7 Author(s)
Zhou, Biao ; State Key Lab of Rare Earth Materials Chemistry and Applications and PKU-HKU Joint Lab on Rare Earth Materials and Bioinorganic Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China ; Zhang, Ya-Wen ; Liao, Chun-Sheng ; Yu, Yue-Jun
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The doping effects of Al3+ on the microstructure, magnetism, polar magneto-optical Kerr effects, and optical property of the sol-gel derived nanocrystalline CoFe2-xAlxO4 (x=0–1.0) thin films on silicon substrate were investigated. Doping of Al3+ not only led to the existence of two Kerr rotation peaks at 620 and 550 nm associated with the crystal-field transition, but also aroused the blueshifting of another peak at 540 nm correlated with the intervalence charge transfer transition. On the other hand, the reflectivity of as-deposited films increased with the Al3+ content x (except x=0.2) due to the decreased light scatter and absorptivity of Al3+ in substitution of Fe3+. Both the blueshifted Kerr effects and enhanced reflectivity in these films are of much benefit to magneto-optical recording. © 2003 American Institute of Physics.

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Applied Physics Letters  (Volume:82 ,  Issue: 8 )