Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 3: Bio- and Molecular Magnetism
MA 3.6: Vortrag
Montag, 26. März 2012, 10:45–11:00, EB 202
Propagation of spin information at supra-molecular scale through hetero-aromatic linkers — •Valerio Bellini1, Th. B. Faust2, G. A. Timco2, G. Lorusso1, A. Candini1, F. Tuna2, E. J. L. McInnes2, R. G. Pritchard2, S. J. Teat3, W. Wernsdorfer4, R. E. P. Winpenny2,5, and M. Affronte1,6 — 1CNR - Istituto di Nanoscienze - S3, Modena, Italy — 2School of Chemistry, The University of Manchester, Manchester, UK — 3ALS, LBNL, Berkeley, USA — 4Laboratoire L. Néel, Grenoble, France — 5The Photon Science Institute, The University of Manchester, Manchester, UK — 6Dipartimento di Fisica, Università di Modena e Reggio Emilia, Modena, Italy
By density-functional theory calculations, we rationalize the behavior of a series of Cr7Ni dimers for which we are able to systematically change the aromatic linker thus tuning the strength of the magnetic interaction, as shown by EPR and microSQUID measurements [1,2]. We also predict a cos2 dependence of the magnetic coupling on the twisting angle between the aromatic cycles [3], a mechanism parallel to charge transport on similar systems [4]. These findings pave the way for a whole series of possible experimental investigations, by systematically varying the organic bridges and the magnetic frontier atoms, in order to tune and choose the appropriate coupling regime.
[1] F. Troiani, V. Bellini, et al., Nanotechnology 21, 274009 (2010). [2] V. Bellini, et al., Phys. Rev. Lett. 106, 227205 (2011). [3] Th. B. Faust, V. Bellini, et al., Published on line in Chem.-Eur. J. (2011) [DOI:10.1002/chem.201101785]. [4] L. Venkataraman, et. al., Nature 442, 904 (2006).