In:
New Journal of Physics, IOP Publishing, Vol. 22, No. 7 ( 2020-07-01), p. 073004-
Abstract:
Ferromagnetism in certain B2 ordered alloys such as Fe 60 Al 40 can be switched on, and tuned, via antisite disordering of the atomic arrangement. The disordering is accompanied by a ∼1 % increase in the lattice parameter. Here we performed a systematic disordering of B2 Fe 60 Al 40 thin films, and obtained correlations between the order parameter ( S ), lattice parameter ( a 0 ), and the induced saturation magnetization ( M s ). As the lattice is gradually disordered, a critical point occurs at 1 − S = 0.6 and a 0 = 2.91 Å, where a sharp increase of the M s is observed. DFT calculations suggest that below the critical point the system magnetically behaves as it would still be fully ordered, whereas above, it is largely the increase of a 0 in the disordered state that determines the M s . The insights obtained here can be useful for achieving tailored magnetic properties in alloys through disordering.
Type of Medium:
Online Resource
ISSN:
1367-2630
DOI:
10.1088/1367-2630/ab944a
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2020
detail.hit.zdb_id:
1464444-7
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