Structural and magnetic properties of magnetic shape memory alloys on Ni-Mn-Co-In self-standing films

Hiroyuki Miki, Koki Tsuchiya, Makoto Ohtsuka, Marcel Gueltig, Manfred Kohl, Toshiyuki Takagi

Research output: Chapter in Book/Report/Conference proceedingChapter

3 Citations (Scopus)

Abstract

Ni-Mn-In films containing cobalt were deposited on a poly-vinyl alcohol (PVA) substrate using a dual magnetron sputtering apparatus with Ni45Mn40In15 and Co targets. The RF power for the Ni-Mn-In target was kept at 200 W, and the DC power for the cobalt target was 8 W. The thicknesses of the deposited films were 1 and 5 µm. After deposition, the films were annealed at 1123 K for 3.6 ks for 1 µm and 1023 K for 3.6 ks + 1173 K for 3.6 ks for 5 µm. The crystallinity of the films was affected by the heat treatment, and the films showed layered structures, such as 10M- and 14M-type structures. The martensitic transformation and magnetic phase transition influence each other, and both have a magnetic fielddependence. In particular, the 5 µm film shows a metamagnetic phase transition with small transition temperature hysteresis. The magnetization experiments for the 5 µm film reveal a drastic magnetization change ΔM of 26 emu/g at 0.05 T and a martensitic transformation finish temperature change ΔMf of -8.5 K at 5 T.

Original languageEnglish
Title of host publicationAdvanced Structured Materials
PublisherSpringer Verlag
Pages149-160
Number of pages12
DOIs
Publication statusPublished - 2017

Publication series

NameAdvanced Structured Materials
Volume73
ISSN (Print)1869-8433
ISSN (Electronic)1869-8441

Keywords

  • Metamagnetic shape-memory effect
  • Nickel-Manganese-Indium alloy
  • Shape memory materials
  • Thin film

ASJC Scopus subject areas

  • Materials Science(all)

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