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Zhao, Y. Y.; Yang, H. W.; Liu, Y.; Kuang, H.; Zhang, M.; Zuo, W. L.; Wang, J.; Hu, F. X.; Sun, J. R.; Shen, B. G.
IEEE transactions on magnetics, 2015-Nov., 2015-11-00, 20151101, Letnik: 51, Številka: 11Journal Article
Here, we report strain-induced high coercivity in La 0.7 Sr 0.3 CoO 3 (LSCO) films, which suffer in-plane tensile strains due to the positive lattice mismatch between the substrate and the LSCO bulk. The films on (011)-0.7Pb(Mg 1/3 Nb 2/3 )O 3 -0.3PbTiO 3 exhibit large uniaxial anisotropy, large coercivity, and high saturation magnetization at low temperature in contrast to the well soft magnetic behaviors in LSCO bulk. It is found that the coercivity of the 40 nm (001)-LSCO/SrTiO 3 film can be as high as 1.45 T at 10 K and the observed coercivity decreases rapidly as the thickness increases, though the Curie temperature is below room temperature. The large coercivity and anisotropy should be closely related to the strain-induced structural changes and the different orbital ordering of Co 3+ and Co 4+ ions. Meanwhile, the enhanced domain wall pinning by the tensile strain may also contribute to the observed high coercivity.
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