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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).

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