Nonthermal viscosity in magnets: Quantum tunneling of the magnetization (invited)

J. Tejada*, Xixiang Zhang, Ll Balcells

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

75 Scopus citations


In this article we present experimental results on the magnetic relaxation in different systems (single domain particles, magnetic grains, and random magnets). The existence of two relaxation regimes is demonstrated. At high temperatures, the magnetic viscosity S≡1/M0∂M/∂ ln(t) is proportional to temperature in accordance with theoretical expectation for thermally activated processes. At low temperatures, the viscosity is independent of temperature, providing evidence to quantum tunneling of magnetization. Qualitative agreement between theory and experiment is found.

Original languageEnglish (US)
Pages (from-to)6709-6714
Number of pages6
JournalJournal of Applied Physics
Issue number10
StatePublished - Dec 1 1993

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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