Magneto-structural correlations in a systematically disordered B2 lattice

• 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 similar to 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 anda(0)= 2.91 angstrom, where a sharp increase of theM(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 ofa(0)in the disordered state that determines theM(s). The insights obtained here can be useful for achieving tailored magnetic properties in alloys through disordering.

Ämnesord

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Nyckelord

phase transitions

disorder

ion beam modifications

magneto-structural effects

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