Ferromagnetism in nanoscale BiFeO3

Details Ferromagnetism in nanoscale BiFeO3 Ferromagnetism in nanoscale BiFeO3

2007-05-17

arxiv.org/abs/0705.2498v1

Appl. Phys. Lett. 91, 062510 (2007)

Physics

Condensed Matter

Materials Science

13 pages including 4 figures; pdf only; submitted to Appl. Phys. Lett

Scientific paper

10.1063/1.2768201

A remarkably high saturation magnetization of ~0.4mu_B/Fe along with room temperature ferromagnetic hysteresis loop has been observed in nanoscale (4-40 nm) multiferroic BiFeO_3 which in bulk form exhibits weak magnetization (~0.02mu_B/Fe) and an antiferromagnetic order. The magnetic hysteresis loops, however, exhibit exchange bias as well as vertical asymmetry which could be because of spin pinning at the boundaries between ferromagnetic and antiferromagnetic domains. Interestingly, like in bulk BiFeO_3, both the calorimetric and dielectric permittivity data in nanoscale BiFeO_3 exhibit characteristic features at the magnetic transition point. These features establish formation of a true ferromagnetic-ferroelectric system with a coupling between the respective order parameters in nanoscale BiFeO_3.

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