Epitaxial thin films of hexagonal ErMnO3 fabricated on Pt(111)/Al2O3(0001) and

yttria-stabilized zirconia(111) substrates exhibited both ferroelectric character and

magnetic ordering at low temperatures. As the temperature was reduced, the

ErMnO3 films first showed antiferromagnetism. At lower temperatures, the films

deposited at lower oxygen partial pressures exhibited spin glass behaviour. This reentrant

spin glass behaviour was attributed to competition between an

antiferromagnetic interaction in the hexagonal geometry and a ferromagnetic

interaction caused by a change in Mn valence induced by excess electrons from the

oxygen vacancies.

Oxygen Vacancy Induced Re-Entrant Spin Glass Behaviour in Multiferroic

ErMnO3 Thin Films. S.Y.Jang, D.Lee, J.H.Lee, T.W.Noh, Y.Jo, M.H.Jung,

J.S.Chung: Applied Physics Letters, 2008, 93[16], 162507