Butterfly hysteresis loop at nonzero bias field in antiferromagnetic molecular rings: cooling by adiabatic magnetization |
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Authors: | Waldmann O Koch R Schromm S Müller P Bernt I Saalfrank R W |
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Institution: | Physikalisches Institut III, Universit?t Erlangen-Nürnberg, Germany. waldmann@physik.uni-erlangen.de |
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Abstract: | At low temperatures, the magnetization of the molecular ferric wheel NaFe6 exhibits a step at a critical field B(c) due to a field-induced level crossing. By means of high-field torque magnetometry we observed a hysteretic behavior at the level crossing with a characteristic butterfly shape which is analyzed in terms of a dissipative two-level model. Several unusual features were found. The nonzero bias field of the level crossing suggests the possibility of cooling by adiabatic magnetization. |
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