MAGNETIC-RELAXATION PROCESSES IN HYDROGEN-CHARGED ELECTRON-IRRADIATEDPD3FE

Ordered (L1(2)) and disordered Pd3Fe is charged with hydrogen, both el ectrolytically and thermally, and then irradiated at about 40 K with 3 MeV electrons to a dose of 9.6 x 10(22) m-2. A detailed investigation of the resulting magnetic relaxation spectra and their annealing beha viours is made. In ordered Pd3Fe, relaxation peaks are observed at 34 and 74 K; these are increased in amplitude over the corresponding peak s in irradiated, uncharged samples. This is attributed to the trapping of intrinsic defects at hydrogen. Apart from this, no significant dif ference is found from the relaxation spectra of hydrogen-charged, irra diated Pd3Fe. It is concluded that the interactions between hydrogen a nd radiation-induced defects in Pd3Fe are too small to produce any add itional, measurable relaxation effects.