Dresden 2006 – scientific programme
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MA: Magnetismus
MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)
MA 20.10: Poster
Tuesday, March 28, 2006, 15:15–19:15, P1
Epitaxial growth and properties of multiferroic BiMO3 (M = Fe, Cr) thin films — •S. Geprägs, M. Opel, S.T.B. Goenenwein, and R. Gross — Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meissner-Str. 8, 85748 Garching
The coexistence of ferroelectricity and ferromagnetism makes
multiferroic materials very attractive. Due to its strong
ferroelectric (TC = 1103K) and magnetic behavior (TN = 643K)
the compound BiFeO3 has been extensively studied. Recently, it
was reported that BiFeO3 thin films show enhanced ferroelectric
and ferromagnetic properties due to epitaxial strain, but this
observation is still controversial [1,2]. Moreover, in the
compound BiCrO3 theoretical predictions suggest a G-type
antiferromagnetic ground state accompanied by an antiferroelectric
structural distortion. While BiCrO3 therefore is also an
interesting multiferroic material, no investigations of the
ferroelectric properties, and also no successful thin film growth has been reported so far.
We have fabricated a series of high-quality epitaxial thin films
of the compounds BiMO3 (M = Fe, Cr) using pulsed laser
deposition. The samples were characterized by high resolution
x-ray diffraction, magnetization, transport, and dielectric
measurements. In spite of their high structural quality, we have
found no evidence for ferromagnetism in our BiFeO3 films. We
critical discuss these findings in context of the literature and
compare them to the situation in BiCrO3.
[1] J. Wang et al., Science 299, 1719 (2003).
[2] W. Eerenstein et al., Science 307, 1203b (2005).