Effect of magnetizing field on the martensitic transformations in a melt spun NiMnGa alloy

A. K. Panda, Satnam Singh, S. K. Das, A. Mitra, Michael Rudolf Koblischka, Brice Jamieson, Saibal Roy

Research output: Contribution to journalArticle

Abstract

The investigation addresses the effect of magnetizing field on the magnetic properties of melt spun Ni52.84Mn19.6Ga27.56 (at%) alloy ribbons. Magnetization behaviour at different fields was observed using a superconducting quantum interference device magnetometer for heating and cooling cycles. The plots showed distinct changes in magnetization around the characteristic temperatures at austenitic start and finish (AS, AF), martensitic start and finish (MS, MF). With increasing field AS, MF were unaffected. In the range of martensitic start and its finish temperature, the zero field cooled and field cooled measurements indicated magnetization drops indicating antiferromagnetic interactions, which is characteristic of the martensitic phase formation. It was shown from x-ray diffraction analysis that the low martensitic fraction in the majority austenite phase induced the splitting in the L21 austenitic ordering. This was further corroborated by the evidence of a few martensitic plates around grain boundaries at room temperature which is close to martensitic start temperature.

Original languageEnglish
Article number245004
JournalJournal of Physics D: Applied Physics
Volume42
Issue number24
DOIs
Publication statusPublished - 2009 Dec 28
Externally publishedYes

Fingerprint

Martensitic transformations
martensitic transformation
Magnetization
magnetization
austenite
Temperature
magnetometers
ribbons
temperature
SQUIDs
x ray diffraction
Magnetometers
grain boundaries
plots
Austenite
magnetic properties
interference
cooling
Magnetic properties
Grain boundaries

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

Cite this

Effect of magnetizing field on the martensitic transformations in a melt spun NiMnGa alloy. / Panda, A. K.; Singh, Satnam; Das, S. K.; Mitra, A.; Koblischka, Michael Rudolf; Jamieson, Brice; Roy, Saibal.

In: Journal of Physics D: Applied Physics, Vol. 42, No. 24, 245004, 28.12.2009.

Research output: Contribution to journalArticle

Panda, A. K. ; Singh, Satnam ; Das, S. K. ; Mitra, A. ; Koblischka, Michael Rudolf ; Jamieson, Brice ; Roy, Saibal. / Effect of magnetizing field on the martensitic transformations in a melt spun NiMnGa alloy. In: Journal of Physics D: Applied Physics. 2009 ; Vol. 42, No. 24.
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