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Magneto-optical analysis as a powerful tool to analyse local magnetic field distribution across superconducting and magnetic materials
|Laura Gozzelino 2, Danilo Botta 2, Angelica Chiodoni 2, Roberto Gerbaldo 2, Gianluca Ghigo 2, Francesco Laviano 2, Bruno Minetti 2, Enrica Mezzetti 2, Piotr Przyslupski 1, A Tsarev 1, Andrzej Wisniewski 1|
1. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland
Magneto-optical analysis is a powerful tool to analyse local magnetic field distribution across superconducting and magnetic materials. We present a careful procedure of non-linear calibration for quantitative evaluation of the local magnetic field in superconducting and magnetic materials. In particular the in-plane field distribution must be carefully taken into account to avoid under-estimation of the out of plane component [1,2,3]. The experimental results concern imaging of different superconducting and magnetic materials ranging from low temperature superconductors to magnetic superconducting heterostructures. In particular we present a detailed imaging of a YBa2Cu3O7/La0.7Sr0.3MnO3/LaAlO3 multilayer. The substrate exhibits a tri-crystal twinned structure. At the tri-crystal centre point substrates twins meet each other in three different directions: the developed magnetic domains exhibit the expected annihilation on twins due to opposite in-plane orientation of the magnetization and form out-of-plane domain-walls. After cooling below YBCO critical temperature, vortices are nucleated over out-of-plane magnetic domain-walls. Following their own stray-field orientation they nicely decorate such magnetic domain-walls.
Presentation: oral at E-MRS Fall Meeting 2004, Symposium E, by Laura Gozzelino
See On-line Journal of E-MRS Fall Meeting 2004
Submitted: 2004-04-29 11:41 Revised: 2009-06-08 12:55