Title: Ion mass dependence of irradiation-induced local creation of ferromagnetism in Fe(60)Al(40) alloys
Authors: Fassbender, J ×
Liedke, M O
Strache, T
Moeller, W
Menéndez Dalmau, Enric
Sort, J
Rao, K V
Deevi, S C
Nogués, J #
Issue Date: 2008
Publisher: Published by the American Physical Society through the American Institute of Physics
Series Title: Physical Review B, Condensed Matter and Materials Physics vol:77 issue:17 pages:1744301-1744305
Abstract: Ion irradiation of Fe60Al40 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.
ISSN: 1098-0121
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Non-KU Leuven Association publications
× corresponding author
# (joint) last author

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