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Magnetic properties of the magnetophotonic crystal based on bismuth iron garnet

2012; American Institute of Physics; Volume: 112; Issue: 9 Linguagem: Inglês

10.1063/1.4764345

1520-8850

E. Popova, Liubov Magdenko, H. Niedoba, Marwan Deb, B. Dagens, B. Bérini, Mathias Vanwolleghem, Christèle Vilar, François Gendron, Arnaud Fouchet, J. Scola, Y. Dumont, M. Guyot, N. Keller,

Advanced Fiber Optic Sensors

This article reports on the magnetism of continuous and patterned bismuth iron garnet (Bi3Fe5O12 or BIG) thin films for magnetophotonic crystal (MPC) applications. The exact knowledge of the magnetic properties is crucial for the design of fully functional MPC. BIG thin films were grown on several types of isostructural substrates by pulsed laser deposition. The growth conditions and bismuth transfer were optimized to obtain good quality magneto-optically active films compatible with nanostructuring process. MPC were successfully fabricated from BIG/GGG(001) films with low roughness and high Faraday rotation. Magnetic characteristics (magnetization, anisotropy, magnetic domains, magnetization reversal) of the continuous BIG films and MPC were extensively studied and compared to the results of the micromagnetic simulations performed for MPC with different anisotropy. The present study shows that the fabrication of the MPC structure lowers the magnetocrystalline and uniaxial in-plane anisotropies and induces a partial out-of-plane magnetization. External field smaller than 2000 G is sufficient to ensure the out-of-plane saturation of magnetization for optimum device operation, in agreement with micromagnetic calculations. The experimentally determined magnetic properties of MPC are fully compatible with the device operation.