Ion mass dependence of irradiation-induced local creation of ferromagnetism in Fe{sub 60}Al{sub 40} alloys
- Institute of Ion Beam Physics and Materials Research, Forschungszentrum Dresden-Rossendorf, P.O. Box 51 01 19, 01314 Dresden (Germany)
Ion irradiation of Fe{sub 60}Al{sub 40} alloys results in the phase transformation from the paramagnetic, chemically ordered B2 phase to the ferromagnetic, chemically disordered A2 phase. The magnetic phase transformation is related to the number of displacements per atom (dpa) during the irradiation. For heavy ions (Ar{sup +}, Kr{sup +}, and Xe{sup +}), a universal curve is observed with a steep increase in the fraction of the ferromagnetic phase that reaches saturation, i.e., a complete phase transformation, at about 0.5 dpa. This proves the purely ballistic nature of the disordering process. If light ions are used (He{sup +} and Ne{sup +}), a pronounced deviation from the universal curve is observed. This is attributed to bulk vacancy diffusion from the dilute collision cascades, which leads to a partial recovery of the thermodynamically favored B2 phase. Comparing different noble gas ion irradiation experiments allows us to assess the corresponding counteracting contributions. In addition, the potential to create local ferromagnetic areas embedded in a paramagnetic matrix is demonstrated.
- OSTI ID:
- 21143538
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 77, Issue 17; Other Information: DOI: 10.1103/PhysRevB.77.174430; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
Similar Records
Radiation behavior of high-entropy alloys for advanced reactors. Final report
Tuneable magnetic patterning of paramagnetic Fe{sub 60}Al{sub 40} (at. %) by consecutive ion irradiation through pre-lithographed shadow masks