Free-standing and single-crystalline Fe 1-xMn xSi nanowires with room-temperature ferromagnetism and excellent magnetic response

Min Hsiu Hung, Chiu Yen Wang, Jianshi Tang, Ching Chun Lin, Te Chien Hou, Xiaowei Jiang, Kang L. Wang, Lih Juann Chen

Research output: Contribution to journalArticlepeer-review

Abstract

Figure Persented: High-aspect-ratio Fe 1-xMn xSi nanowires with room-temperature ferromagnetism were synthesized by a chemical vapor deposition (CVD) method in one step. This is the first report of ternary silicide nanowires using magnetic Mn ions to partially replace metal sites in the host matrix. Here we report the excellent magnetic characteristics of Fe 1-xMn xSi nanowires, which exhibit strong ferromagnetism at room temperature and high magnetoresistance (MR) variation. As-synthesized Fe 1-xMn xSi nanowires show a hyperbranched morphology and a spin-disorder behavior. The strong spin interaction in Fe 1-xMn xSi nanowires, induced by the substitution of Fe sublattices for magnetic Mn ions, was revealed in the hysteresis loops. The magnetization versus magnetic field (M-H) curves of Fe 1-xMn xSi nanowires are much less sensitive to the temperature variation from 10 to 300 K than those of FeSi nanowires. Remarkably, the excellent MR performance, -41.6% at 25 K with a magnetic field of 9 T, was demonstrated in an individual Fe 0.88Mn 0.12Si nanowire.

Original languageEnglish
Pages (from-to)4884-4891
Number of pages8
JournalACS nano
Volume6
Issue number6
DOIs
Publication statusPublished - 2012 Jun 26

All Science Journal Classification (ASJC) codes

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

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