The magnetic and structural properties of the magnetic shape memory compound Ni2Mn1.44Sn0.56

P. J. Brown, A. P. Gandy, K. Ishida, R. Kainuma, T. Kanomata, K. U. Neumann, K. Oikawa, B. Ouladdiaf, K. R.A. Ziebeck

Research output: Contribution to journalArticle

237 Citations (Scopus)

Abstract

Magnetization and high resolution neutron powder diffraction measurements on the magnetic shape memory compound Ni2Mn1.44Sn 0.56 have confirmed that it is ferromagnetic below 319 K and undergoes a structural phase transition which takes place at TM ≤ 221 K on cooling and 239 K on warming. The high temperature phase has the cubic L 21 structure, a ≤ 5.973 Å, with the excess manganese atoms occupying the 4(b) tin sites. In the cubic phase at 245 K the manganese moments at both sites were found to be ferromagnetically aligned. The magnetic moment at the 4(a) sites was 1.88(10) μB but it was only 0.53(18) μB/Mn at the 4(b) sites. The low temperature phase stable below TM has an orthorhombic structure with space group Pmma related to the cubic phase through a Bain transformation aortho ≤ (a cub+bcub)/2; bortho ≤ ccub; cortho ≤ (acub- bcub). The change in cell volume in the transition is only ≈0.5%, suggesting that the atomic moments are unchanged although the spontaneous magnetization drops significantly.

Original languageEnglish
Pages (from-to)2249-2259
Number of pages11
JournalJournal of Physics Condensed Matter
Volume18
Issue number7
DOIs
Publication statusPublished - 2006 Feb 22

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'The magnetic and structural properties of the magnetic shape memory compound Ni<sub>2</sub>Mn<sub>1.44</sub>Sn<sub>0.56</sub>'. Together they form a unique fingerprint.

  • Cite this

    Brown, P. J., Gandy, A. P., Ishida, K., Kainuma, R., Kanomata, T., Neumann, K. U., Oikawa, K., Ouladdiaf, B., & Ziebeck, K. R. A. (2006). The magnetic and structural properties of the magnetic shape memory compound Ni2Mn1.44Sn0.56. Journal of Physics Condensed Matter, 18(7), 2249-2259. https://doi.org/10.1088/0953-8984/18/7/012