Controlling the microstructure and associated magnetic properties of Ni0.2Mn3.2Ga0.6 melt-spun ribbons by annealing

Mahmud Khan, Ohud Alshammari, Balamurugan Balasubramanian, Bhaskar Das, David J. Sellmyer, Ahmad Us Saleheen, Shane Stadler

Research output: Contribution to journalArticle

Abstract

Here we report on the structural and magnetic properties of Ni0.2Mn3.2Ga0.6 melt-spun ribbons. The as-spun ribbons were found to exhibit mixed cubic phases that transform to non-cubic structure upon annealing. Additionally, an amorphous phase was found to co-exist in all ribbons. The SEM images show that minor grain formation occurs on the as-spun ribbons. However, the formation of extensive nano-grains was observed on the surfaces of the annealed ribbons. While the as-spun ribbons exhibit predominantly paramagnetic behavior, the ribbons annealed under various thermal conditions were found to be ferromagnetic with a Curie temperature of about 380 K. The ribbons annealed at 450 °C for 30 minutes exhibit a large coercive field of about 2500 Oe. The experimental results show that the microstructure and associated magnetic properties of the ribbons can be controlled by annealing techniques. The coercive fields and the shape of the magnetic hysteresis loops vary significantly with annealing conditions. Exchange bias effects have also been observed in the annealed ribbons.

Original languageEnglish (US)
Article number056230
JournalAIP Advances
Volume7
Issue number5
DOIs
StatePublished - May 1 2017

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ribbons
magnetic properties
microstructure
annealing
grain formation
Curie temperature
hysteresis
scanning electron microscopy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Controlling the microstructure and associated magnetic properties of Ni0.2Mn3.2Ga0.6 melt-spun ribbons by annealing. / Khan, Mahmud; Alshammari, Ohud; Balasubramanian, Balamurugan; Das, Bhaskar; Sellmyer, David J.; Saleheen, Ahmad Us; Stadler, Shane.

In: AIP Advances, Vol. 7, No. 5, 056230, 01.05.2017.

Research output: Contribution to journalArticle

Khan, Mahmud ; Alshammari, Ohud ; Balasubramanian, Balamurugan ; Das, Bhaskar ; Sellmyer, David J. ; Saleheen, Ahmad Us ; Stadler, Shane. / Controlling the microstructure and associated magnetic properties of Ni0.2Mn3.2Ga0.6 melt-spun ribbons by annealing. In: AIP Advances. 2017 ; Vol. 7, No. 5.
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