Evidence for resonant tunneling of magnetization in Mn12 acetate complex
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 stro...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 1997 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/10656 |
| Acceso en línea: | https://hdl.handle.net/2445/10656 |
| Access Level: | acceso abierto |
| Palabra clave: | Materials magnètics Propietats magnètiques Magnetic properties Magnetic materials |
| Sumario: | 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. |
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