MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Magnetoelastic Anomalies Exhibited by Ni–Fe(Co)–Ga Polycrystalline Ferromagnetic Shape Memory Alloy
Patricia LázpitaVolodymyr A. ChernenkoJose M. BarandiaránJon GutiérrezHideki HosodaJose A. Rodríguez-Velamazán
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2013 Volume 54 Issue 8 Pages 1535-1538

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Abstract

The martensitic transformation (MT) as well as the structure, magnetic and magnetostrain properties of a polycrystalline Ni50.1Fe18.6Ga27.2Co4.1 (at%) ferromagnetic shape memory alloy are investigated. The studied alloy exhibits a martensitic ferromagnetic phase near room temperature that shows a non-modulated tetragonal structure with a tetragonality ratio of c/a > 1. Strain measurements reveal a complex spontaneous change at MT amounting to about 0.15% that increases up to 0.22% at 5 T of the applied magnetic field indicating orientation influence of the field on the martensitic variants growth. Magnetostrain measurements enable evaluation of the magnetic field-induced strain effect in the vicinity of MT. The sample shows moderate deformation achieving values of 70 ppm related to the magnetization rotation and volume magnetostriction that does not saturate at applied magnetic field of 5 T.

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© 2013 The Japan Institute of Metals and Materials
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