Mn5Si3 Nanoparticles: Synthesis and Size-Induced Ferromagnetism

Bhaskar Das, Balamurugan Balasubramanian, Priyanka Manchanda, Pinaki Mukherjee, Ralph Skomski, George C. Hadjipanayis, David J. Sellmyer

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Mn-based silicides are fascinating due to their exotic spin textures and unique crystal structures, but the low magnetic ordering temperatures and/or small magnetic moments of bulk alloys are major impediments to their use in practical applications. In sharp contrast to bulk Mn5Si3, which is paramagnetic at room temperature and exhibits low-temperature antiferromagnetic ordering, we show ferromagnetic ordering in Mn5Si3 nanoparticles with a high Curie temperature (Tc ≈ 590 K). The Mn5Si3 nanoparticles have an average size of 8.6 nm and also exhibit large saturation magnetic polarizations (Js = 10.1 kG at 300 K and 12.4 kG at 3 K) and appreciable magnetocrystalline anisotropy constants (K1 = 6.2 Mergs/cm3 at 300 K and at 12.8 Mergs/cm3 at 3 K). The drastic change of the magnetic ordering and properties in the nanoparticles are attributed to low-dimensional and quantum-confinement effects, evident from first-principle density-functional-theory calculations.

Original languageEnglish (US)
Pages (from-to)1132-1137
Number of pages6
JournalNano Letters
Volume16
Issue number2
DOIs
StatePublished - Feb 10 2016

Keywords

  • Mn-based alloys
  • Nanoparticles
  • ferromagnetism
  • quantum confinement

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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