Butterfly hysteresis loop at non-zero bias field in antiferromagnetic molecular rings: cooling by adiabatic magnetization

Abstract

At low temperatures, the magnetization of the molecular ferric wheel NaFe${}_6$ 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 non-zero bias field of the level-crossing suggests the possibility of cooling by adiabatic magnetization.

4 pages, 5 figures, REVTEX4, to appear in PRL

References in corpus (4)

• Butterfly hysteresis loop and dissipative spin reversal in the S=1/2, V15 molecular complex
• Macroscopic Quantum Coherence in Molecular Magnets
• Electron and Nuclear Spin Dynamics in Antiferromagnetic Molecular Rings
• Magnetization in Molecular Iron Rings

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