Large exchange-bias in Ni55Mn19Al24Si 2 polycrystalline ribbons

Rohit Singh, Babita Ingale, Lajos K. Varga, Vladimir V. Khovaylo, Ratnamala Chatterjee

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The crystal structure, phase transition and exchange bias effect in induction melted polycrystalline ribbons of Ni55Mn 19Al24Si2 have been studied using room temperature x-ray diffraction (XRD), differential scanning calorimetry (DSC) and magnetic measurements. The sample was found to show structural transformation temperatures such as austenite start (As)=306 K, austenite finish (Af)=316 K, martensite start (Ms)=305 K and martensite finish (Mf)=294 K all above room temperature. The room temperature structure evaluated as orthorhombic 14 M with lattice parameters a=4.14 Å, b=29.84 Å, and c=5.72 Å. Importantly at ∼2 K, the sample showed a large exchange bias field of about 2520 Oe, which is the maximum value ever reported among the Heusler alloy samples.

Original languageEnglish
Pages (from-to)143-146
Number of pages4
JournalPhysica B: Condensed Matter
Volume448
DOIs
Publication statusPublished - Sep 1 2014

    Fingerprint

Keywords

  • Austenite phase
  • Exchange bias
  • Martensite phase
  • Ni-Mn-Al-Si Heusler alloys
  • Orthorhombic structure
  • Shape memory alloys

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this