High-frequency ESR and frequency domain magnetic resonance spectroscopic studies of single molecule magnets in frozen solution

F. El Hallak, J. van Slageren, J. Gómez-Segura, D. Ruiz-Molina, and M. Dressel
Phys. Rev. B 75, 104403 – Published 7 March 2007

Abstract

Frozen solutions of the single molecule magnet Mn12Piv (Piv=pivalate or trimethylacetate) are studied by magnetization and magnetic resonance investigations. ac magnetic susceptibility measurements show that the system is stable in solution. Interestingly, the barrier and prefactor for the thermally activated magnetization relaxation are the same as in the solid state. This means that this system is not influenced by its surroundings, in contrast to other Mn12 derivatives. The zero-field-splitting spin Hamiltonian parameters of Mn12Piv in solution are determined by magnetic resonance spectroscopy methods to be very similar to those in the solid state. By these methods, it is also possible to distinguish between truly dissolved and precipitated species, which is not possible by magnetization measurements.

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  • Received 7 December 2006

DOI:https://doi.org/10.1103/PhysRevB.75.104403

©2007 American Physical Society

Authors & Affiliations

F. El Hallak1, J. van Slageren1,*, J. Gómez-Segura2, D. Ruiz-Molina2, and M. Dressel1

  • 11. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70550 Stuttgart, Germany
  • 2Institut de Ciència de Materials de Barcelona (CSIC), Campus Universitari, ES-08193, Bellaterra, Catalonia, Spain

  • *Electronic address: slageren@pi1.physik.uni-stuttgart.de

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Vol. 75, Iss. 10 — 1 March 2007

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