Giant magnetostriction in annealed Co1-xFex thin-films

Dwight Hunter, Will Osborn, Ke Wang, Nataliya Kazantseva, Jason Hattrick-Simpers, Richard Suchoski, Ryota Takahashi, Marcus L. Young, Apurva Mehta, Leonid A. Bendersky, Sam E. Lofland, Manfred Wuttig, Ichiro Takeuchi

Research output: Contribution to journalArticlepeer-review

136 Scopus citations

Abstract

Chemical and structural heterogeneity and the resulting interaction of coexisting phases can lead to extraordinary behaviours in oxides, as observed in piezoelectric materials at morphotropic phase boundaries and relaxor ferroelectrics. However, such phenomena are rare in metallic alloys. Here we show that, by tuning the presence of structural heterogeneity in textured Co1-xFex thin films, effective magnetostriction λeff as large as 260 p.p.m. can be achieved at low-saturation field of ∼10mT. Assuming λ100 is the dominant component, this number translates to an upper limit of magnetostriction of λ100 ≈5λeff >1,000p.p.m. Microstructural analyses of Co1-xFex films indicate that maximal magnetostriction occurs at compositions near the (fcc+bcc)/bcc phase boundary and originates from precipitation of an equilibrium Co-rich fcc phase embedded in a Fe-rich bcc matrix. The results indicate that the recently proposed heterogeneous magnetostriction mechanism can be used to guide exploration of compounds with unusual magnetoelastic properties.

Original languageEnglish (US)
Article number518
JournalNature communications
Volume2
Issue number1
DOIs
StatePublished - 2011

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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