Luis Vitalla, FernandoBartolomé, J.Fernández, J. F.Tejada Palacios, JavierHernández Ferràs, Joan ManelZhang, XixiangZiolo, R. F.2009-12-292009-12-2919970163-1829https://hdl.handle.net/2445/10659The magnetic ac susceptibility x of oriented Mn12Ac crystallites has been measured as a function of temperature, field, and frequency. The field has been applied at different values of the angle u with respect to the sample easy axis. For T55 K, the isothermal and adiabatic x limits have been determined as a function of field. For u50° and intermediate frequencies, Lorentzian-shaped peaks have been observed at magnetic field values Hn5nH1 with n50, 1, and 2 where H154.1 kOe. As u increases these maxima shift to higher fields, that satisfy Hncosu5const, and decrease in amplitude. The relaxation time t 1 follows Arrhenius’ law with respect to temperature and decreases sharply at H5Hn . The observed phenomenology unambiguously proves the existence of field-tuned tunneling between excited magnetic states which are thermally populated. At 5 K, the effective activation energy and the spin states involved in the tunneling process have been obtained.9 p.application/pdfeng(c) The American Physical Society, 1997Materials magnèticsPropietats magnètiquesMagnetic propertiesMagnetic materialsinfo:eu-repo/semantics/article117654info:eu-repo/semantics/openAccess