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Giant strain-induced ferromagnetism in Fe59Mn17Al24
Authors:Yifeng Liao  Qi Zeng
Institution:Thayer School of Engineering, Dartmouth College , Hanover , NH 03755 , USA
Abstract:Giant strain-induced ferromagnetism (SIF) has been observed in Fe59Mn17Al24 single crystals. The crystals in either the L21 or B2 ordered state are weakly magnetic, with saturation magnetization, M s, of 9–10?emu/g. After a 60% thickness reduction, the M s of the L21 crystal increased to 89?emu/g, whereas the M s of the B2 crystal after a 53% reduction was 96?emu/g, an M s approximately four times larger than that of the largest SIF observed in other ordered alloys. By comparison, mechanically alloyed powder of the same composition, which had a fully-disordered bcc structure, showed a similar M s of ~90?emu/g. The increased M s in strained Fe59Mn17Al24 single crystals is attributed primarily to the generation of increased magnetic coupling due to chemical disordering. This large M s is substantially reduced after annealing at 573?K.
Keywords:disorder  intermetallics  magnetic properties  strain-induced ferromagnetism
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