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 15.149: Poster

Dienstag, 27. März 2007, 15:00–19:00, Poster A

Magnetism of the single molecule magnet system [(Mn^IIL₂)₃Mn^II](BF₄)₂ — •Manuel Prinz¹, Sebastian Voget¹, Niklas Damnik¹, Michael Raekers¹, Karsten Kuepper², Phalguni Chaudhuri³, Simon George⁴, Marin Coldea⁵, and Manfred Neumann¹ — ¹Universität Osnabrück, Fachbereich Physik, Barbarastr. 7, D-49069 Osnabrück — ²Forschungszentrum Rossendorf, Nanofunktionsschichten, Postfach 510119, D-01314 Dresden — ³MPI für Bioanorganische Chemie, PO Box 101365, D-45413 Mülheim an der Ruhr — ⁴Lawrence Berkeley National Laboratory, Advanced Biological and Environmental X-ray Facility, Berkeley, CA 94720, USA — ⁵Faculty of Physics, Babeş-Bolyai University, RO-400084, Cluj-Napoca

The single molecule magnet system [(Mn^IIL₂)₃Mn^II](BF₄)₂ containing four Mn²⁺ ions has been studied using X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy, and X-ray magnetic circular dichroism (XMCD). The XPS Mn 2p and Mn 3s spectra confirm the manganese 2+ valency. From XMCD measurements at a temperature of T=2 K and a magnetic field of B=5 T we obtained a high magnetic moment of 12 µ_B/f.u. This spin moment agrees in an excellent way with magnetic measurements which show a magnetization saturation of 10 µ_B/f.u. at 7 T and 2 K. From XMCD a quenching of the Mn orbital moments was observed (m_orb=0.4 µ_B/f.u.).