An acoustic emission study of the effect of a magnetic field on the martensitic transition in Ni2MnGa

Ludwig, Benno; Strothkaemper, Christian; Klemradt, Uwe; Moya, Xavier; Mañosa, Lluís; Vives, Eduard; Planes, Antoni
March 2009
Applied Physics Letters;3/23/2009, Vol. 94 Issue 12, p121901
Academic Journal
Acoustic emission measurements during the martensitic transition of a Ni–Mn–Ga magnetic shape-memory alloy reveal the intermittent and jerky character of the transition. The distribution of the amplitude of the acoustic emission events shows power law behavior, which reflects the absence of characteristic scales in the process. In this paper we show that the distribution is affected by an applied magnetic field, which proves that the transition dynamics is strongly influenced by magnetostructural coupling taking place at multiple length scales. The martensitic start temperature and the power law exponent of the amplitude distribution are measured in dependence of the applied field.


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