Investigation of structure and magnetic properties of Ru-doped YMnO3.

Authors :: Dai, Y.
Zhang, A. M.
Yang, L. P.
Gao, Z. R.
Wu, X. S.
Source :: Journal of Applied Physics; 7/28/2016, Vol. 120 Issue 4, p1-5, 5p, 1 Diagram, 1 Chart, 5 Graphs
Publication Year :: 2016
Abstract: A series of polycrystalline YMn<subscript>1-x</subscript>Ru<subscript>x</subscript>O<subscript>3</subscript> (0≤x≤0.2) samples were prepared by traditional solidstate reaction method. Effects of doping on the microstructures and magnetic properties were investigated. Microstructural results reveal that samples crystallize in a single hexagonal structure with P6<subscript>3</subscript>cm group for x≤0.1. Lattice parameters a, c, and unit-cell volume of YMn<subscript>1-x</subscript>Ru<subscript>x</subscript>O<subscript>3</subscript> are found to increase with doping content, which are ascribed to the larger radius of Ru<superscript>3+</superscript> than that of Mn<superscript>3+</superscript>. Weak ferromagnetism is found and is enhanced with increasing doping concentration x. The bond angles of Mn-O3-Mn and Mn-O4-Mn are changed in the opposite trends, which break the Mn-Mn exchange interaction, thus the antiferromagnetic ordering. The MnO<subscript>5</subscript> bipyramid is found to be relieved and the trimerization of Mn ions is weakened. These structural modifications result in the increase of weak ferromagnetism ordering in samples. [ABSTRACT FROM AUTHOR]