Abstract
We have shown the possibility to obtain M-type barium hexaferrite thin films with thickness of ~200–450 nm on the surface of dielectric α-Al2O3 substrates with low microwave dielectric loss (tan δ ~ 10−4 GHz) by a sol–gel method. For the production of high-dense homogeneous thin films of M-type barium hexaferrite (BaFe12O19, BHF) with nanorod-like grains and a uniform distribution of iron and barium ions, we have studied the synthesis conditions for thermally stable film-forming solutions with high concentrations of barium ions. Films with a c-axis magnetic texture were obtained by spin-coating the former solutions on α-Al2O3 substrates and annealing at temperatures between 473 and 1073 K. The resulting textured M-type BHF films have demonstrated the following magnetic parameters: H c⊥ = 334 kA/m, H c|| = 167 kA/m; M s⊥ = 0.005 emu, M s|| = 0.003 emu for the films’ thickness of ~200 nm, and H c⊥ = 360 kA/m, H c|| = 338 kA/m; M s⊥ = 0.009 emu, M s|| = 0.007 emu for the films’ thickness of ~450 nm. These M-type BHF thin films can serve as a promising basis for further development of multilayer microwave resonant elements.
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Acknowledgments
We acknowledge the project “NANOLICOM” (FP7-PEOPLE-2009-IRSES program, 2011–2014, Grant agreement No. 247579) and the partial support of the Spanish Project MAT2013-40489-P.
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Solovyova, E.D., Calzada, M.L. & Belous, A.G. The effect of sol–gel preparation conditions on structural characteristics and magnetic properties of M-type barium hexaferrite thin films. J Sol-Gel Sci Technol 75, 215–223 (2015). https://doi.org/10.1007/s10971-015-3692-6
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DOI: https://doi.org/10.1007/s10971-015-3692-6