A strong magneto-optical activity in rare-earth La(3+) substituted M-type strontium ferrites. F. Hu, L. Fernández-García, X.S. Liu, D.R. Zhu, M. Suárez, J.L. Menéndez. 2011

Journal of Applied Physics. Volume: 109 Issue: 11 Article Number: 113906, 2011

M-type strontium ferrites with substitution of Sr2+ by rare-earth La3+ were prepared by conventional ceramic technology. The structure, magnetic properties, and magneto-optical Kerr activity of Sr1−xLaxFe12O19 (x = 0, 0.05, 0.10, 0.15, 0.20) were investigated by x-ray diffraction (XRD), vibrating sample magnetometer (VSM), and magneto-optical ellipsometry, respectively. X-ray diffraction showed that the samples sintered at 1290 °C for 3 h were single M-type hexagonal ferrites. The magnetic properties were remarkably changed due to the valence change of Fe ions induced by the substitution of La ions. Most significantly, an important magneto-optical activity was induced in the La3+ substituted M-type strontium ferrites around 3 eV