Origin of ferromagnetism in BaTiO 3  nanoparticles | Zendy

Bahoosh Safa Golrokh | Zendy; Trimper Steffen | Zendy; Wesselinowa Julia M. | Zendy

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Origin of ferromagnetism in BaTiO 3 nanoparticles

Author(s) -

Bahoosh Safa Golrokh,

Trimper Steffen,

Wesselinowa Julia M.

Publication year - 2011

Publication title -

physica status solidi (rrl) – rapid research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.786

H-Index - 68

eISSN - 1862-6270

pISSN - 1862-6254

DOI - 10.1002/pssr.201105419

Subject(s) - nanocrystalline material , ferromagnetism , multiferroics , condensed matter physics , materials science , valence (chemistry) , nanoparticle , magnetization , particle size , chemical physics , nanotechnology , ferroelectricity , chemistry , physics , dielectric , optoelectronics , organic chemistry , quantum mechanics , magnetic field

Based on a microscopic approach we demonstrate that the unexpected ferromagnetic properties of BaTiO 3 (BTO) or PTO observed recently at room temperature are due to oxygen vacancies at the surface of the nanocrystalline materials. Such vacancies lead to the appearance of Ti 3+ or Ti 2+ ions with nonzero net spin. The resulting different valence states composed of Ti 3+ or Ti 2+ offer a nonzero magnetization which decreases with increasing particle size. The system shows a multiferroic behavior below a critical size of the nanoparticles and the related polarization tends to a saturation value when the particle size is enhanced. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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