MQT of Magnetic Particles

Wolfgang Wernsdorfer ()
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Wolfgang Wernsdorfer: Lab. L. Néel - CNRS

A chapter in Macroscopic Quantum Coherence and Quantum Computing, 2001, pp 195-205 from Springer

Abstract: Abstract This brief review focuses on quantum tunnelling of magnetisation studied in individual nanoparticles or nanowires where the complications due to distributions of particle size, shape etc. are avoided. We discuss briefly various measuring techniques and review the basic concepts of a new micro-SQUID technique which allows us to study single nanometersized magnetic particles at low temperature. In the case of sufficiently small particles, the magnetisation reversal occurs by uniform rotation and the measurement of the angular dependence of the magnetisation reversal yields the effective magnetic anisotropy. The influence of the temperature on the magnetisation reversal is discussed. Probabilities of switching, switching field distributions, and telegraph noise measurements are proposed to check the predictions of the Néel Brown theory describing thermal activated magnetisation reversal. At very low temperature, we will see how quantum effects can be revealed.

Keywords: Magnetism; nanoparticle; uniform rotation; SQUID; Néel-Brown model; macroscopic quantum tunnelling. (search for similar items in EconPapers)
Date: 2001
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Persistent link: https://EconPapers.repec.org/RePEc:spr:sprchp:978-1-4615-1245-5_20

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DOI: 10.1007/978-1-4615-1245-5_20

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