Disorder-Driven Spin-Reorientation in Multiferroic $h-YM{n}_{1-x}F{e}_x{O}_3$

Abstract

Magnetic structure evolution of multiferroic hexagonal $YM{n}_{1-x}F{e}_x{O}_3$ ($x=0,0.05,$ and $0.1$) has been studied by carrying out detailed temperature-dependent neutron diffraction at zero- and 5T-fields. Thermodynamic data confirm antiferromagnetic ordering at $T_N$ in all the compositions. Our sub-$T_N$ neutron diffraction results assign the magnetic structure of pure $YMn{O}_3$ to ${\Gamma }_1$ irreducible representation. Over the perturbative-doping range, the magnetic configuration changes via ${\Gamma }_1+{\Gamma }_2$ for $YM{n}_{0.95}F{e}_{0.05}{O}_3$ on to ${\Gamma }_2$ for $YM{n}_{0.9}F{e}_{0.1}{O}_3$, as the maiden compositional analogue of spin-reorientation; its occurrence in temperature-domain already reported for several manganites. Moreover, while the large thermal isostructural changes observed above $T_N$ are subdued in the ordered state, small alterations by the applied 5T-field are relatively uniform across, confirming strong magneto-elastic nature of the system. Decrease of the ordered magnetic moment (${\mu }_{ord}$) and planar magnetic frustration noted with Fe-doping is enhanced by the applied field, apparently through canting.

19 pages, 1 table, 9 figures, 32 (numbered) references (groups)

References in corpus (2)

• Dominance of magnetoelastic coupling in multiferroic hexagonal YMnO_3
• Magnetoelastic effects in multiferroic YMnO${}_3$

Cited by in corpus (2)

• Magnetic structures and magnetoelastic coupling of Fe-doped hexagonal manganites LuMn1-xFexO3 (0 < x < 0.3)
• Spin-Lattice Coupling and Frustrated Magnetism in Fe-doped Hexagonal LuMnO3