Almeida-Thouless Line in BiFeO3: Is Bismuth Ferrite a mean field spin glass?

Abstract

Low-temperature magnetic properties of epitaxial BiFeO3 thin films grown on (111)-SrTiO3 substrates have been studied. ZFC and FC magnetization curves show a large discrepency beginning at a characteristic temperature Tf that is dependent on the magnetic-field strengh. Tf(H) varies according to the well known de Aleimda-Thouless line (varies in Hexp(2/3)) suggesting an acentric long rnage spin-glass behavior and mean field system.

Submitted to J. Phys. Cond. Matter

References in corpus (5)

• Weak ferromagnetism and magnetoelectric coupling in bismuth ferrite
• Electric-field-induced spin-flop in BiFeO3 single crystals at room-temperature
• Structural distortion and magnetism of BiFeO3 epitaxial thin films: a Raman spectroscopy and neutron diffraction study
• Particle size dependence of magnetization and phase transition near T_N in multiferroic BiFeO3
• Absence of an Almeida-Thouless line in Three-Dimensional Spin Glasses

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