Field tuning of thermally activated magnetic quantum tunnelling in Mn12-Ac molecules

J. M. Hernández*, Xixiang Zhang, F. Luis, J. Bartolomé, J. Tejada, R. Ziolo

*Corresponding author for this work

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Zero-field-cooled magnetization, magnetic relaxation, and a.c. susceptibility measurements have been performed on a Mn12-Ac oriented powdered sample as a function of temperature, field, and orientation. Magnetization jumps and susceptibility peaks have been observed about magnetic-field values Bn = nB1, where B1 ≈ 5 kG. These anomalies are due to the existence of relaxation rate maxima near Bn. From these experimental results we infer the existence of resonant spin tunnelling between degenerate excited levels of opposite spin orientation.

Original languageEnglish (US)
Pages (from-to)301-306
Number of pages6
JournalEurophysics Letters
Issue number4
StatePublished - Aug 1 1996

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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