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Exchange-biased quantum tunnelling in a supramolecular dimer of single-molecule magnets

Nature volume 416, pages 406–409 (2002)Cite this article

Abstract

Various present and future specialized applications of magnets require monodisperse, small magnetic particles, and the discovery of molecules that can function as nanoscale magnets was an important development in this regard1,2,3. These molecules act as single-domain magnetic particles that, below their blocking temperature, exhibit magnetization hysteresis, a classical property of macroscopic magnets. Such ‘single-molecule magnets’ (SMMs)4 straddle the interface between classical and quantum mechanical behaviour because they also display quantum tunnelling of magnetization5,6 and quantum phase interference7. Quantum tunnelling of magnetization can be advantageous for some potential applications of SMMs, for example, in providing the quantum superposition of states required for quantum computing8. However, it is a disadvantage in other applications, such as information storage, where it would lead to information loss. Thus it is important to both understand and control the quantum properties of SMMs. Here we report a supramolecular SMM dimer in which antiferromagnetic coupling between the two components results in quantum behaviour different from that of the individual SMMs. Our experimental observations and theoretical analysis suggest a means of tuning the quantum tunnelling of magnetization in SMMs. This system may also prove useful for studying quantum tunnelling of relevance to mesoscopic antiferromagnets.

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Figure 1: The structure of the [Mn4O3Cl4(O2CEt)3(py)3]2 dimer, denoted [Mn4]2.
Figure 2: Magnetization (M) of [Mn4]2 (plotted as fraction of maximum value Ms) versus applied magnetic field (μ0H).
Figure 3: The spin state energies of [Mn4]2 as a function of applied magnetic field.
Figure 4: Derivative of the hysteresis loop at 0.04 K (Fig. 2b) and at different field sweep rates.

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Acknowledgements

We thank the US National Science Foundation for support. We also thank A. Benoit, D. Mailly and C. Thirion for help in the development of the micro-SQUID technique, and B. Barbara for his support.

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Authors and Affiliations

  1. Laboratoire Louis Néel-CNRS, BP166, 25 Avenue des Martyrs, Grenoble, Cedex 9, 38042, France

    Wolfgang Wernsdorfer

  2. Department of Chemistry, University of Florida, Gainesville, 32611-7200, Florida, USA

    Núria Aliaga-Alcalde & George Christou

  3. Department of Chemistry, University of California at San Diego, La Jolla, 92093-0358, California, USA

    David N. Hendrickson

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  1. Wolfgang Wernsdorfer
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  3. David N. Hendrickson
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  4. George Christou
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Correspondence to George Christou.

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Wernsdorfer, W., Aliaga-Alcalde, N., Hendrickson, D. et al. Exchange-biased quantum tunnelling in a supramolecular dimer of single-molecule magnets. Nature 416, 406–409 (2002). https://doi.org/10.1038/416406a

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