Noncollinear spin structure in F e3+x C o3-x T i2 (x=0,2,3) from neutron diffraction

Haohan Wang, Balamurugan Balasubramanian, Rabindra Pahari, Ralph Skomski, Yaohua Liu, Ashfia Huq, D. J. Sellmyer, Xiaoshan Xu

Research output: Contribution to journalArticle

Abstract

Neutron powder diffraction has been used to investigate the spin structure of the hard-magnetic alloy Fe3+xCo3-xTi2 (x=0,2,3). The materials are produced by rapid quenching from the melt, they possess a hexagonal crystal structure, and they are nanocrystalline with crystallite sizes D of the order of 40 nm. Projections of the magnetic moment onto both the crystalline c axis and the basal plane were observed. The corresponding misalignment angle exhibits a nonlinear decrease with x, which we explain as a micromagnetic effect caused by Fe-Co site disorder. The underlying physics is a special kind of random-anisotropy magnetism that leads to the prediction of 1/D1/4 power-law dependence of the misalignment angle on the crystallite size.

Original languageEnglish (US)
Article number064403
JournalPhysical Review Materials
Volume3
Issue number6
DOIs
StatePublished - Jun 4 2019

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ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy (miscellaneous)

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