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We compute mean waiting times between thermally-activated magnetizationreversals in a nanodisk with parameters similar to a free CoFeB layer used inmagnetic random access memories. By combining Langer's theory and forward fluxsampling simulations, we show that the Arrhenius prefactor can take values upto 10$^{21}$ Hz, orders of magnitude beyond the value of 10$^{9}$ Hz typicallyassumed, and varies drastically as a function of material parameters. We showthat the prefactor behaves like an exponential of the activation energy, whichhighlights a case of the Meyer-Neldel compensation rule. This suggests thatmodeling information retention times with a barrier-independent prefactor insuch magnetic storage elements is not justified.

Entropy-reduced retention times in magnetic memory elements: A case of the Meyer-Neldel Compensation Rule