Hernández Ferràs, Joan ManelZhang, XixiangLuis Vitalla, FernandoTejada Palacios, JavierFriedman, Jonathan R.Sarachik, M. P.Ziolo, R. F.2009-12-292009-12-2919970163-1829https://hdl.handle.net/2445/10656We have measured the dc magnetization at low temperatures of tetragonal crystals of Mn12 acetate complex [Mn12O12[CH3COO]16[H2O]4], a material composed of a large ~Avogadro’s! number of identical magnetic molecules, each of spin 10. Exchange coupling between Mn ions within each molecule is very strong, while the interaction between molecules is negligible. A large, uniaxial anisotropy ~;60 K! gives rise to a doubly degenerate ground state corresponding to spin projections of 610 along the easy axis ~c axis!; hysteretic behavior is found below a blocking temperature Tb;3 K. Based on measurements of oriented crystallites at temperatures between 1.7 and 3.2 K, we report strong evidence for resonant tunneling of the magnetization: periodic steps in the hysteresis loop, and periodic marked increases in the magnetic relaxation rate at the magnetic fields corresponding to these steps. A total of seven increases in the relaxation rate were found within the temperature range of our experiments with a period of 0.46 T; we suggest that many more such steps would be found at lower temperatures. We attribute these observations to thermally assisted resonant tunneling of the magnetization and propose a detailed model to account for our results.8 p.application/pdfeng(c) The American Physical Society, 1997Materials magnèticsPropietats magnètiquesMagnetic propertiesMagnetic materialsinfo:eu-repo/semantics/article117653info:eu-repo/semantics/openAccess