Magnetism of L10Fe50-x}Co}-x}Pt50 films

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Abstract

Films of L10 -structure Fe50-xCoxPt 50 films are synthesized by co-sputtering Fe, Co and Pt on (001) MgO substrates and Si substrates with in-situ heating at 830°C. The nanostructures and magnetic properties of the films are characterized by X-ray diffraction, transmission electron microscopy and SQUID. The compositions of the samples Fe50-xCoxPt50 are designed to maintain an atomic (Fe+Co):Pt ratio of 50:50 while increasing the Co content in each successive sample. In all samples, the X-ray diffraction patterns from samples on MgO substrate exhibit three strong peaks, namely L10Fe 50-xCoxPt50 (001), (002) and MgO (002). The X-ray and electron diffraction patterns from untextured samples deposited on Si substrates can be indexed using the L10-structure, being consistent with the result of samples on MgO substrate. Hysteresis-loop measurements show that with increase of the Co concentration from 0 to 15 at%, the saturation magnetization Ms increases from 1017 μ/cm3 to 1165 μ/cm3, the coercivity decreases from 30 kOe to 14 kOe, and anisotropy decreases from 67 Merg/cm3 to 46 Merg/cm3. The nominal maximum energy products are in the range of 39-41 MGOe.

Original languageEnglish (US)
Article number6559098
Pages (from-to)3292-3294
Number of pages3
JournalIEEE Transactions on Magnetics
Volume49
Issue number7
DOIs
StatePublished - 2013

Keywords

  • Exchange-coupling
  • magnetic anisotropy
  • magnetic film
  • magnetism
  • permanent magnet

ASJC Scopus subject areas

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

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