Regensburg 2007 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)
MA 15.119: Poster
Dienstag, 27. März 2007, 15:00–19:00, Poster A
Magnetic field dependent structure of TbFe3(BO3)4 resolved by x-ray diffraction — •Martin Philipp1, Olga Kataeva1,2, Christian Hess1, Rüdiger Klingeler1, Natalia Tristan1, Bernd Büchner1, Martin von Zimmermann3, Alexander Vasiliev4, and Elena Popova4 — 1Leibniz-Institute for Solid State and Materials Research, IFW-Dresden, 01171 Dresden, Germany — 2A.E.Arbuzov Institute, Russian Academy of Sciences, Arbuzov Str. 8, 420088 Kazan, Russia — 3HASYLAB@DESY, Notkestr. 85, 22603 Hamburg, Germany — 4Physics Faculty, Moscow State University, 119992 Moscow, Russia
Recently, rare earth iron borates RFe3(BO3)4 (R: Rare Earth) attracted attention as candidates for possible multiferroic behavior. TbFe3(BO3)4 exhibits antiferromagnetic order below ∼39 K. In this ordered phase a spin flop-like transition occurs when a magnetic field is applied parallel to the crystallographic c-axis. This involves the reorientation of the antiferromagnetic ordered Fe and the polarized Tb magnetic moments. We have studied this magnetic transition by means of hard x-ray diffraction (hν≈ 100 keV). In the high field phase we observed superlattice reflections which indicate a doubling of the unit cell along the c-axis. We compare the field and temperature dependence of these superlattice reflections with results from thermodynamics.