Exchange and magnetic order in bulk and nanostructured Fe5Si3

R. Skomski, P. Kumar, B. Balamurugan, B. Das, P. Manchanda, P. Raghani, A. Kashyap, D. J. Sellmyer

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6 Scopus citations

Abstract

The Curie temperature of bulk and nanostructured Fe5Si3 is investigated using experiments, density-functional simulations, and many-body model calculations. The bulk intermetallic, which crystallizes in the hexagonal D88 structure, exhibits several intriguing features: it does not exist as a room-temperature equilibrium phase, is close to the onset of ferromagnetism, and exhibits two crystallographically very different Fe sites. The samples, produced by rapid quenching (bulk) and cluster deposition (nanoparticulate thin films), have Curie temperatures of about 400 K. Interatomic exchange constants are calculated using the Kohn-Korringa-Rostoker (KKR) method and used to solve the multisublattice mean-field problem for the system. The Vienna ab initio simulation package (VASP) is employed to study the dependence of the Fe moment on the thermally induced spin misalignment, and a model calculation yields an estimate for quantum-spin-liquid corrections. The theory includes Heisenberg exchange but overestimates the Curie temperature, and a discussion is given regarding additional approaches to handle weakly ferromagnetic multisublattice intermetallic compounds.

Original languageEnglish (US)
Pages (from-to)438-447
Number of pages10
JournalJournal of Magnetism and Magnetic Materials
Volume460
DOIs
StatePublished - Aug 15 2018

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Keywords

  • Curie temperature
  • Heisenberg model
  • Quantum spin liquids
  • Weak ferromagnetism

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Skomski, R., Kumar, P., Balamurugan, B., Das, B., Manchanda, P., Raghani, P., Kashyap, A., & Sellmyer, D. J. (2018). Exchange and magnetic order in bulk and nanostructured Fe5Si3 Journal of Magnetism and Magnetic Materials, 460, 438-447. https://doi.org/10.1016/j.jmmm.2018.02.015