Tunneling rate for superparamagnetic particles by the instanton method

E.H. Martins Ferreira and M.C. Nemes

Physica A: Statistical Mechanics and its Applications, 2002, vol. 310, issue 3, 435-449

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 (s∼3000ℏ), the observation of magnetization changes due to pure unitary tunnel effects is unlikely.

Keywords: Macroscopic tunneling; Instanton; Functional integral; Superparamagnetism (search for similar items in EconPapers)
Date: 2002
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:310:y:2002:i:3:p:435-449

DOI: 10.1016/S0378-4371(02)00620-9

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