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Simultaneous detection of the acoustic emission and Barkhausen noise during the martensitic transition of a NiMnGa magnetic shape-memory alloy
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Baro, Jordi, Dixon, S., Edwards, R. S. (Rachel S.), Fan, Yichao, Keeble, Dean Samuel, Mañosa, Lluís, Planes, Antoni and Vives, Eduard (2013) Simultaneous detection of the acoustic emission and Barkhausen noise during the martensitic transition of a NiMnGa magnetic shape-memory alloy. Physical Review B (Condensed Matter and Materials Physics), Volume 88 . Article number 174108. ISSN 1098-0121.
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Official URL: http://journals.aps.org/prb/abstract/10.1103/PhysR...
Abstract
We present simultaneous measurements of acoustic emission and magnetic Barkhausen noise during the thermally induced martensitic transition in a Ni-Mn-Ga single crystal. The range where structural acoustic emission avalanches are detected extends for more than 50 K for both cooling and heating ramps, with a hysteresis of ∼10 K. The magnetic activity occurs during the structural transition, exhibiting similar hysteresis, but concentrated in the lower half of the temperature range. Statistical analysis of individual signals allows characterization of the broad distributions of acoustic emission and Barkhausen amplitudes. By studying the times of arrival of the avalanche events we detect the existence of correlations between the two kinds of signals, with a number of acoustic emission signals occurring shortly after a Barkhausen signal. The order of magnitude of the observed delays is compatible with the time needed for the propagation of ultrasound through the sample, showing correlation of some of the signals.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QC Physics | ||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||||
Publisher: | American Physical Society | ||||||
ISSN: | 1098-0121 | ||||||
Official Date: | November 2013 | ||||||
Dates: |
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Volume: | Volume 88 | ||||||
Article Number: | Article number 174108 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||
Funder: | Spanish Ministry of Science (MAT2010-15114), Royal Society (International Joint Project JP090474), ERC, 202735 |
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