Large exchange bias in polycrystalline ribbons of Ni56Mn21Al22Si1

Rohit Singh, Babita Ingale, L. Varga, Vladimir V. Khovaylo, S. Taskaev, Ratnamala Chatterjee

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Large exchange bias (EB) effect is demonstrated in a Ni56Mn21Al22Si1 polycrystalline ribbon that shows spin-glass behaviour below 68 K and superparamagnetic (SPM) behaviour above this temperature. The average magnetic moment μ of the SPM clusters is estimated to be considerably smaller than that reported for other Heusler alloy systems that demonstrate spin glass behaviour and EB effect. The M-H loops measured in field-cooled (FC) conditions show significant asymmetry that is observed to be strongly field and temperature dependant. The maximum EB field (HEB ∼2.6 kOe at 20 kOe and 2 K) is much larger than that reported for any metallic alloy system with conventional EB effect. The dependence of HEB on temperature shows an exponential decrease. An approach towards enhancement of the EB effect in this conventional EB system can be realized via manipulation of SPM or superferromagnetic (SFM) cluster size with variation of cooling magnetic field.

Original languageEnglish
Pages (from-to)143-147
Number of pages5
JournalJournal of Magnetism and Magnetic Materials
Volume394
DOIs
Publication statusPublished - Jul 2 2015

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ribbons
Spin glass
Magnetic moments
spin glass
Temperature
Magnetic fields
Cooling
temperature
manipulators
magnetic moments
asymmetry
cooling
augmentation
magnetic fields

Keywords

  • Exchange bias effect
  • Martensitic transformation
  • Ni-Mn-Al-Si Heusler alloy
  • Polycrystalline ribbon
  • Spin glass
  • Superparamagnetic cluster

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Large exchange bias in polycrystalline ribbons of Ni56Mn21Al22Si1. / Singh, Rohit; Ingale, Babita; Varga, L.; Khovaylo, Vladimir V.; Taskaev, S.; Chatterjee, Ratnamala.

In: Journal of Magnetism and Magnetic Materials, Vol. 394, 02.07.2015, p. 143-147.

Research output: Contribution to journalArticle

Singh, Rohit ; Ingale, Babita ; Varga, L. ; Khovaylo, Vladimir V. ; Taskaev, S. ; Chatterjee, Ratnamala. / Large exchange bias in polycrystalline ribbons of Ni56Mn21Al22Si1. In: Journal of Magnetism and Magnetic Materials. 2015 ; Vol. 394. pp. 143-147.
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AU - Chatterjee, Ratnamala

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