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Magnetic Avalanches in Molecular Magnets

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Molecular Magnets

Part of the book series: NanoScience and Technology ((NANO))

Abstract

The reversal of the magnetization of crystals of molecular magnets that have a large spin and high anisotropy barrier generally proceeds below the blocking temperature by quantum tunneling. This is manifested as a series of controlled steps in the hysteresis loops at resonant values of the magnetic field where energy levels on opposite sides of the barrier cross. An abrupt reversal of the magnetic moment of the entire crystal can occur instead by a process commonly referred to as a magnetic avalanche, where the molecular spins reverse along a deflagration front that travels through the sample at subsonic speed. In this chapter, we review experimental results obtained to date for magnetic deflagration in molecular nanomagnets.

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Notes

  1. 1.

    As is true for the determination of blocking temperatures, the position of the dashed line depends on the typical experimental time scale.

  2. 2.

    Experimental evidence of such inhomogeneous states has been obtained by local measurements in Mn12-ac that show oscillating magnetization near a tunneling resonance; see [40].

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Acknowledgements

The author thanks the students whose experiments made this review possible, most particularly Yoko Suzuki and Sean McHugh; and Eugene Chudnovsky and Dmitry Garanin for their careful reading of this manuscript. Support was provided by NSF Grant No. DMR-00451605.

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Authors and Affiliations

  1. City College of New York, CUNY, New York, NY, 10031, USA

    Myriam P. Sarachik

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  1. Myriam P. Sarachik
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Correspondence to Myriam P. Sarachik .

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Editors and Affiliations

  1. Condensed Matter Physics Facultad de Ciencias (A), University of Zaragoza ICMA, CSIC, Zaragoza, Spain

    Juan Bartolomé

  2. Condensed Matter Physics Facultad de Ciencias (A), University of Zaragoza ICMA, CSIC, Zaragoza, Spain

    Fernando Luis

  3. Condensed Matter Physics Facultad de Ciencias (A), University of Zaragoza ICMA, CSIC, Zaragoza, Spain

    Julio F. Fernández

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Sarachik, M.P. (2014). Magnetic Avalanches in Molecular Magnets. In: Bartolomé, J., Luis, F., Fernández, J. (eds) Molecular Magnets. NanoScience and Technology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-40609-6_5

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