Changes in Curie temperature due to irradiation and thermal annealing in amorphous Fe20Ni60P14B6

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Abstract
The effects of proton (H+), deuteron (D+), and helium (He+) irradiations at 2.0 MeV on the Curie temperature of amorphous Fe20Ni60P14B6 are reported and compared to thermal annealing effects. Changes in Curie temperature are reported following isochronal anneals (5‐h duration) at temperatures up to 325 °C and following room‐temperature irradiations. The Curie temperature increase for samples irradiated with H+ is greater than that observed with D+, which is greater than that observed with He+. Reversibility of Curie temperature has been reported by other workers for thermal annealing of various amorphous magnetic alloys. In this paper, reversibility of Curie temperature is reported for samples successively irradiated with H+, He+, and then D+. A qualitative interpretation of irradiation effects is given in terms of transient heating about the track of a projectile ion.