Comment on "Tunnel Window's Imprint on Dipolar Field Distributions"
Abstract
In a recent letter Alonso et al. (Phys. Rev. Lett. 87, 097205 (2001)) present Monte Carlo simulations for interacting dipoles. Short-time relaxation was caused by a simple noise field, acting uniformly over an "energy window" of small width (to simulate the fluctuating nuclear spin bias). However, the physics of the tunneling relaxation of an ensemble of tunneling nanomagnets or magnetic molecules (as well as of the "tunneling hole" formation) is different and here we discuss this point.
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