Spatio-temporal Structural Fluctuation in Radiation induced amorphization and 1/f noise

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Temporal nanostructural fluctuations brought about by transient, metastable atom-cluster formation during radiation-induced amorphizing transformation in the intermetallic compound NiTi, observed using a combination of high-resolution high-voltage electron microscopy and molecular dynamics simulations, were characterized in terms of power-law responses of nonequilibrium, energy-dissipative systems. Within the framework of the multi-Lorentzian picture, the resultant power law also describes the multirelaxation time (i.e., cluster lifetime) distribution. In addition, a unified relation for the autocorrelation functions for such fluctuation phenomena was newly proposed.