A strong magneto-optical activity in rare-earth La 3+ substituted M-type strontium ferrites

M-type strontium ferrites with substitution of Sr 2+ by rare-earth La 3+ were prepared by conventional ceramic technology. The structure, magnetic properties, and magneto-optical Kerr activity of Sr 1− x La x Fe 12 O 19 ( x =0, 0.05, 0.10, 0.15, 0.20) were investigated by x-ray diffraction (XRD), vi...

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Published in:Journal of applied physics 2011-06, Vol.109 (11), p.113906-113906-5
Main Authors: Hu, Feng, Fernandez-Garcia, Lucia, Liu, Xian-Song, Zhu, De-Ru, Suárez, Marta, Luis Menéndez, Jose
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Summary:M-type strontium ferrites with substitution of Sr 2+ by rare-earth La 3+ were prepared by conventional ceramic technology. The structure, magnetic properties, and magneto-optical Kerr activity of Sr 1− x La x Fe 12 O 19 ( 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 La 3+ substituted M-type strontium ferrites around 3 eV.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3587181