INVESTIGATING HIGH-TC SPIRAL ORDERS IN YBa(Cu1-xCox)FeO5 MULTIFERROICS WITH ENHANCED ANISOTROPY AND SPIN-ORBIT COUPLING
The low-magnetic ordering temperatures (typically <100 K) critically restrict the potential uses of magnetoelectric multiferroics for spintronics and low-power magnetoelectric devices. YBaCuFeO5 (YBCFO) displays magnetism-driven ferroelectricity at unexpectedly high temperatures (above RT), being one of the best candidates to switchable, magnetism-driven ferroelectricity at zero field. The stability range of its spiral phase can be extended far beyond room temperature by manipulating the Cu/Fe chemical disorder in the bipyramids and some structural parameters or distances. As an alternative strategy to upgrade its multiferroic properties, the substitution of Cu2+ by Co2+ is proving to be one of the most interesting. In addition to promoting B-site cation disorder, this substitution increases the magnetic anisotropy in the system and the spin-lattice coupling thanks to the significant orbital moment contribution from Co2+ ions, with direct incidence on the stability of the spiral and the magnetoelectric coupling.
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Jose Luis Garcia-Muñoz; FABELO ROSA Oscar Ramon; Arnau Romaguera and ZHANG XIAODONG. (2020). INVESTIGATING HIGH-TC SPIRAL ORDERS IN YBa(Cu1-xCox)FeO5 MULTIFERROICS WITH ENHANCED ANISOTROPY AND SPIN-ORBIT COUPLING. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2680
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