Materials Transactions Online

Materials Transactions, Vol.47 No.03 (2006) pp.631-634
© 2006 The Japan Institute of Metals

Magnetic Emission During Austenite-Martensite Transformation in Ni2MnGa Shape Memory Alloy

Zoltán Balogh1,, Lajos Daróczi1, Lajos Harasztosi1, Dezsö L. Beke1, Thomas A. Lograsso2 and Deborah L. Schlagel2

1Departement of Solid State Physics, University of Debrecen, PO Box. 2., H-4010 Debrecen, Hungary
2Ames Laboratory, Iowa State University, Ames, IA 50011-3020, USA

The magnetic emission signals, accompanying the martensitic transition in Ni2MnGa magnetic shape memory alloy, are studied. The width (duration) and height (amplitude) distributions of the signals exhibit a power-law behaviour, with exponents α and β respectively. The values of α and β are characteristic of the magnetic noise originating from the transition itself and both have the value of 3.0± 0.15.

(Received 2005/9/22; Accepted 2005/12/15; Published 2006/3/15)

Keywords: ferromagnetic shape memory, critical exponent, magnetic emission, nickel–manganese–gallium, Barkhausen noise

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