Macroscopic magnetization tunneling and coherence: Calculation of tunneling-rate prefactors

Anupam Garg*, Gwang Hee Kim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

57 Scopus citations


The tunneling of the total magnetization of a small (100 - diameter) magnetic particle out of metastable easy directions or between degenerate easy directions is studied. The previously known Wentzel-Kramers-Brillouin exponents for the tunneling rates for these processes are supplemented by calculations of the prefactors, for various forms of the magnetocrystalline anisotropy. The calculations are done using spin-coherent-state path integrals. The formalism for evaluating fluctuation determinants for such path integrals is developed.

Original languageEnglish (US)
Pages (from-to)12921-12929
Number of pages9
JournalPhysical Review B
Issue number22
StatePublished - 1992

ASJC Scopus subject areas

  • Condensed Matter Physics


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