Anomalous temperature dependence of coercivity at low temperature in L10 FePt thin films

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6 Citations (Scopus)

Abstract

L10 FePt thin films of varying composition were epitaxially grown at different substrate temperatures (400-600° C) on MgO (100) single crystal substrate by magnetron co-sputtering technique. Processing conditions were optimized to produce films with either (002) or a mixture of (002) and (200) crystallites. Effects of two different crystallographic orientations, i.e., (200) and (002) on the magnetic properties of L10 FePt were studied. Anomalous temperature variation of coercivity (Hc) (i.e., a decrease in Hc with decreasing temperature) was observed at low temperatures for the films having comparable intensities of (200) and (002) diffraction peaks in the X-ray diffraction patterns. We have identified the cause for this anomalous behavior in Hc. Strong inter-particle exchange interaction between (200) and (002) crystallites is shown to be responsible for the anomalous temperature variation in Hc.

Original languageEnglish
Article number6027848
Pages (from-to)4394-4397
Number of pages4
JournalIEEE Transactions on Magnetics
Volume47
Issue number10
DOIs
Publication statusPublished - 2011 Oct

Keywords

  • Anomalous temperature dependence of coercivity
  • L1 FePt thin films
  • high magnetocrystalline anisotropy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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