Depression of the coercive force via oxygen exposure of ultrathin Fe/Pt(111) films

Huei Ying Ho, Ying Chen Lee, Jyh-Shen Tsay

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Abstract

The composition and magnetic properties of Fe/Pt(111) after oxygen exposure were investigated. At room temperature the amount of adsorbed oxygen on the surface increased as oxygen exposure also increased until saturation. For Fe/Pt(111) that were thinner than two monolayers, the oxidative process dominated the initial oxygen exposure. In case of thicker Fe, the physical adsorption was more important. Due to the ferromagnetic properties of the iron oxides (α-Fe2O3), the Kerr hysteresis loops experienced a slight change. We estimated that the diffusion length of oxygen atoms into the Fe films were approximately three monolayers. Under saturated oxygen exposure, the formation of iron oxide hindered the formation of ordered Fe-Pt alloys and results in a depression on the coercive force.

Original languageEnglish
Article number5467457
Pages (from-to)1360-1362
Number of pages3
JournalIEEE Transactions on Magnetics
Volume46
Issue number6
DOIs
Publication statusPublished - 2010 Jun 1

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Keywords

  • Coercive force
  • Iron alloy
  • Oxidation
  • Platinum
  • Ultrathin film

ASJC Scopus subject areas

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

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