Magnetic Relaxation Effects in PrCo5and Sm(x) Nd(1-x)Co5Induced by Hydrogen and Deuterium.

摘要

Measuremtns of the ac susceptibility of PrCo5 powder parallel to its c-axis show the existence of two relaxation processes which are present in samples exposed to hydrogen or deuterium but not in degassed samples. The two relaxations have time constants of 10 sec. at 165K and at 200K and are described by effective activation energies of 0.37 eV and 0.51 eV, respectively. Sm(x)Nd(1-x)Co(x) crystals treated with hydrogen show a magnetic relaxation equivalent to the higher energy process in PrCo5; between -20C and 50C, a strong Barkhausen effect dominates the magnetic behavior.