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Tunneling rate for superparamagnetic particles by the instanton method |
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| Authors: | E. H. Martins Ferreira and M. C. Nemes |
| Affiliation: | a Departamento de Física, Universidade Federal de Minas Gerais, CP 702, 30161-970 Belo Horizonte, MG, Brazil b Instituto de Física, Universidade de São Paulo, CP 66318, 05315-970 São Paulo, SP, Brazil |
| Abstract: | We derive the tunneling rate for paramagnetic molecules in the context of a collective spin model. By means of path integral methods, an analytical expression is derived. Given the very large spins in question (s3000), the observation of magnetization changes due to pure unitary tunnel effects is unlikely. |
| Keywords: | Macroscopic tunneling Instanton Functional integral Superparamagnetism |
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