Structure and magnetic properties of ultrathin Ni films on Pt(111) with Co buffer layers

C. S. Shern, H. Y. Ho, S. H. Lin, C. W. Su

Research output: Contribution to journalArticle

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Abstract

The growth mode and the structure of ultrathin Ni films on Pt(111) with Co buffer layers were studied by low-energy electron diffraction (LEED) and Auger electron spectroscopy. The comparative study of the magnetic properties between Ni/Pt(111) and Ni/1 ML Co/Pt(111) was investigated by magneto-optical Kerr effect. The oscillation of the specular beam of LEED and the Auger uptake curve were used to calibrate the thickness of Ni overlayers and to study the growth mode of Ni thin films on 1 ML Co/Pt(111). The study of the alloy formation for Ni/1 ML Co/Pt(111) showed that the temperature for mixing Ni and Co in the upper interface without diffusing into the bulk of Pt is independent of the thickness of Ni overlayers. By further increasing the temperature, Co and Ni diffuse into Pt bulk simultaneously to form Co-Pt, Ni-Pt, and Ni-Co-Pt alloys. The temperature of the formation of these alloys is dependent on the Ni thickness. Studies of the magnetic properties showed that the easy axis of the magnetization changed from the cant to the out-of-plane direction when the Co buffer layer was inserted on Ni/Pt(111). The alloy formation causes some interesting changes in the polar Kerr signal. The enhancement in the out-of-plane magnetization of Ni/Co/Pt(111) is mainly contributed by the formation of Co-Pt alloy.

Original languageEnglish
Article number214438
Pages (from-to)1-6
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number21
DOIs
Publication statusPublished - 2004 Dec 1

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Buffer layers
Magnetic properties
buffers
magnetic properties
Low energy electron diffraction
Magnetization
electron diffraction
Optical Kerr effect
magnetization
Auger electron spectroscopy
Kerr effects
Temperature
Auger spectroscopy
temperature
electron spectroscopy
slopes
Thin films
oscillations
energy
augmentation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Structure and magnetic properties of ultrathin Ni films on Pt(111) with Co buffer layers. / Shern, C. S.; Ho, H. Y.; Lin, S. H.; Su, C. W.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 70, No. 21, 214438, 01.12.2004, p. 1-6.

Research output: Contribution to journalArticle

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