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Title: Evidence for resonant tunneling of magnetization in Mn12 acetate complex
Author: Hernández Ferràs, Joan Manel
Zhang, Xixiang
Luis Vitalla, Fernando
Tejada Palacios, Javier
Friedman, Jonathan R.
Sarachik, M. P.
Ziolo, R. F.
Keywords: Materials magnètics
Propietats magnètiques
Magnetic properties
Magnetic materials
Issue Date: 1997
Publisher: The American Physical Society
Abstract: We 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.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review B, 1997, vol. 55, núm. 9, p. 5858-5865.
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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