Ion mass dependence of irradiation-induced local creation of ferromagnetism in Fe60 Al40 alloys

J. Fassbender, M. O. Liedke, T. Strache, W. Möller, E. Menéndez, J. Sort, K. V. Rao, S. C. Deevi, J. Nogués

Producció científica: Contribució a una revistaArticleRecercaAvaluat per experts

36 Cites (Scopus)

Resum

Ion irradiation of Fe60 Al40 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+, Kr+, and Xe+), 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+ and Ne+), 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. © 2008 The American Physical Society.
Idioma originalEnglish
Número d’article174430
RevistaPhysical Review B - Condensed Matter and Materials Physics
Volum77
DOIs
Estat de la publicacióPublicada - 28 de maig 2008

Fingerprint

Navegar pels temes de recerca de 'Ion mass dependence of irradiation-induced local creation of ferromagnetism in Fe60 Al40 alloys'. Junts formen un fingerprint únic.

Com citar-ho