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

Zoltán Balogh; Lajos Daróczi; Lajos Harasztosi; Dezsö L. Beke; Thomas A. Lograsso; Deborah L. Schlagel

doi:10.2320/matertrans.47.631

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

Zoltán Balogh, Lajos Daróczi, Lajos Harasztosi, Dezsö L. Beke, Thomas A. Lograsso, Deborah L. Schlagel

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

JOURNAL FREE ACCESS

2006 Volume 47 Issue 3 Pages 631-634

DOI https://doi.org/10.2320/matertrans.47.631

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Abstract

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.

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