Magneto-optical Faraday and Kerr effect of orthoferrite thin films at high temperatures |
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Authors: | N Keller J Mistrík Š Višňovský DS Schmool Y Dumont P Renaudin M Guyot R Krishnan |
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Institution: | (1) Laboratoire de Magnétisme et d'Optique, Université de Versailles - CNRS, batiment Fermat, 45 avenue des états-Unis, 78035 Versailles Cedex, France, FR;(2) Institute of Physics, Charles University, Ke Karlov 5, 121 16 Prague 2, Czech Republic, CZ;(3) Departamento de Física, Faculdade de Ciências, Universidade do Porto, Rua Campo Alegre 687, 4169 007 Porto, Portugal, PT;(4) Département de Physique, Université de Versailles, 45 avenue des états-Unis, 78035 Versailles Cedex, France, FR |
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Abstract: | Orthoferrites present, as bulk materials, reorientation transitions of their magnetic moment alignment at temperatures depending
on the rare-earth (RE) ion. In particular, orthoferrites (REFeO3) with RE = Sm, Dy, present this transition at T
SRT = 443 K and 36 K, respectively. The spectra of the complex Kerr and Faraday angle have been measured on orthoferrite thin
films (RE = Sm, Dy, Y), which were prepared by pulsed laser deposition on amorphous quartz substrates. The obtained spectra
exhibit contributions of both surfaces and interfaces. Propagation effects of the polarized light in the magneto-optical medium
which is interpreted in terms of a simplified theoretical formalism, is also observed. For selected photon energies, temperature
dependent Faraday rotation measurements, , on orthoferrite thin films (RE = Sm, Dy, Y) have been performed. A quite different thermal variation compared to the bulk
magnetization has been observed. Curie temperatures are found to be close to the bulk values or slightly larger by 10 K to
20 K as in the case of DyFeO3 and YFeO3. For RE = Sm and Dy, increases with increasing temperature contrary to the saturation magnetization, passes through a maximum at about 460 K and
vanishes with a T
C of 647±18 K, 695 K for RE = Sm and Dy respectively.
Received 28 July 2000 |
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Keywords: | PACS 75 50 Gg Ferrimagnetics – 75 70 Ak Magnetic properties of monolayers and thin films – 78 20 Ls Magnetooptical effects |
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