Giant exchange bias in micro-sized magnetic shape memory alloy particles

• We report the effects of the magnetic ground sate and microstructure on exchange bias (EB) in ball milled Ni44Co6Mn39.5Sn10.5 alloys. A giant bias field of 1.49 T has been obtained for the micron-sized particles after 15 h milling, which is considerably larger than that of 2 h milled platelets (0.35 T) and that of the bulk alloy (0.12 T). This giant bias field is attributed to the increased volume fraction of antiferromagnetic/ferromagnetic interface, the enhanced antiferromagnetic fraction and the formed agglomerates. Our results reveal the critical roles of the magnetic ground state and microstructure of milled alloys in determining EB.

Ämnesord

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

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

Nyckelord

mechanical alloying

magnetic particles

exchange bias

spin glass

antiferromagnetic

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