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Single Crystal High Frequency Cavity-based EPR Spectroscopy of Single Molecule Magnets

Published online by Cambridge University Press:  10 February 2011

S. Hill ,
R. S. Edwards ,
S. I. Jones ,
S. Maccagnano ,
J. M. North ,
N. Aliaga ,
E-C. Yang ,
N. S. Dalal ,
G. Christou  and
D. N. Hendrickson
S. Hill
Affiliation:
Department of Physics, University of Florida, Gainesville, FL 32611–8440, USA
R. S. Edwards
Affiliation:
Department of Physics, University of Florida, Gainesville, FL 32611–8440, USA
S. I. Jones
Affiliation:
Department of Physics, University of Florida, Gainesville, FL 32611–8440, USA
S. Maccagnano
Affiliation:
Department of Physics, University of Florida, Gainesville, FL 32611–8440, USA
J. M. North
Affiliation:
Department of Chemistry, Florida State University, Tallahassee, FL 32310, USA
N. Aliaga
Affiliation:
Department of Chemistry, University of Florida, Gainesville, FL 32611–8440, USA
E-C. Yang
Affiliation:
Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, CA 92093, USA
N. S. Dalal
Affiliation:
Department of Chemistry, Florida State University, Tallahassee, FL 32310, USA
G. Christou
Affiliation:
Department of Chemistry, University of Florida, Gainesville, FL 32611–8440, USA
D. N. Hendrickson
Affiliation:
Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, CA 92093, USA
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Abstract

We report high frequency electron paramagnetic resonance (EPR) investigations of a series of high spin (total spin up to S = 10) manganese and nickel complexes which have been shown to exhibit single molecule magnetism, including low temperature (below ∼ 1K) hysteresis loops and resonant magnetic quantum tunneling. A cavity perturbation technique enables high sensitivity oriented single crystal EPR measurements spanning a very wide frequency range (16 to 200+ GHz). Fitting of the frequency and field orientation dependence of EPR spectra allows direct determination of the effective spin Hamiltonian parameters. Studies on a range of materials with varying (approximately axial) site symmetries facilitates an assessment of the role of transverse anisotropy (terms in the Hamiltonian that do not commute with ŝz) in the magnetic quantum tunneling phenomenon.

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References

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