Abstract
Observation of the quantum behaviour of a macroscopic variable is a challenging problem [1,2]. Macroscopic systems showing agreement with theoretical predictions are presently related to superconductivity (see eg the case of SQUIDs in [2]). In magnetism, Macroscopic Quantum Tunnelling (MQT) consists in e.g. the rotation of the magnetization of a single domain small particle by tunnelling through its anisotropy energy barrier, or the motion of a small portion of a domain wall through its pinning energy barrier. The first experiments devoted to this question suggested that the total number of spins involved coherently in these MQT processes is of the order of 103 to 105, depending on the material [3]). Although not at the human scale, this scale is macroscopic in the framework of Quantum Mechanics.
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