Magnetic properties and magneto-optical effect of Co[sub 0.5]Fe[sub 2.5]O[sub 4] nanostructured films

Gu, B. X.
May 2003
Applied Physics Letters;5/26/2003, Vol. 82 Issue 21, p3707
Academic Journal
Co[sub 0.5]Fe[sub 2.5]O[sub 4] ferrite films with nanostructure have been prepared by rf sputtering on a quartz substrate and annealed at temperatures from 400 to 600 °C in air. The magnetic properties and magneto-optical effect have been studied. It has been found that nanocrystalline Co[sub 0.5]Fe[sub 2.5]O[sub 4] films exhibit good magnetic properties and a large magneto-optical effect. The magnetization, coercivity, remanence ratio, and maximum energy product are 455 emu/cm³, 2.8 kOe, 0.72 MGOe, and 2.4 MGOe, respectively. The magneto-optical Faraday rotation is <−3.4°/µm at short wavelength and 4°/µm at the wavelength of 740 nm. These characteristics make them very promising to be used for magneto-optical recording and for permanent magnets. The influence of the distribution of Co[sup 2+] ions on magnetic properties and magneto-optical effect has been discussed.


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