Dissipation in macroscopic quantum tunneling and coherence in magnetic particles (invited)

Anupam K Garg*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

For quantum phenomena involving a macrovariable such as the total moment of a ferromagnetic particle, or the Néel vector of an antiferromagnetic one, environmental couplings play a crucial role. The effect of such couplings, or dissipation, is studied, with emphasis on the nuclear spin environment. It is shown that magnetic macroscopic quantum tunneling (MQT) and coherence (MQC) both become harder to see. Quantitative calculations are presented for the tunneling rate in MQT, and the tunnel splitting and ac susceptibility for MQC. A recent claim to have seen MQC in a resonance experiment on ferritin is critically discussed and the absorption is found to be at least 1500 times larger than predicted by MQC.

Original languageEnglish (US)
Pages (from-to)6168-6173
Number of pages6
JournalJournal of Applied Physics
Volume76
Issue number10
DOIs
StatePublished - Dec 1 1994

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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