Abnormal reduction of coercivity on magnetic cobalt-platinum alloy films

Research output: Contribution to journalArticle

Abstract

Ultrathin Co-Pt alloy films as substrate were studied by the surface magneto-optical Kerr effect. As the growth of Ni, the films show uniquely high polar Kerr responses without any in-plane signals. The coercivity decreased until the thickness of Ni film was higher than 5 ML. A new surface structure was discovered at 7-10 ML Ni/Co-Pt films by the low-energy electron diffraction. Interestingly, polar Kerr signal and coercivity of the 10 ML Ni/Co-Pt(1 1 1) template film reduced rapidly as Co films were further deposited onto only about 1-2 ML. Then the films show a canted magnetization with a rollback hysteresis in the polar configuration during the growth of Co. Coercivity of the 7 ML Co/Ni/Co-Pt film was found unusually down to almost 100 Oe.The corresponding magic number at around 7 ML of Co in the abnormal reduction of coercivity may be attributed to the cluster formations of Co.

Original languageEnglish
JournalJournal of Magnetism and Magnetic Materials
Volume303
Issue number2 SPEC. ISS.
DOIs
Publication statusPublished - 2006 Jan 1

Fingerprint

Platinum alloys
platinum alloys
cobalt alloys
Cobalt alloys
Coercive force
coercivity
Optical Kerr effect
cobalt platinum alloy
Low energy electron diffraction
Kerr effects
Surface structure
Hysteresis
Magnetization
templates
electron diffraction
hysteresis
magnetization

Keywords

  • Cobalt-platinum alloys
  • Coercivity
  • Nickel-platinum alloys
  • Surface magneto-optical Kerr effect
  • Ultrathin films

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Abnormal reduction of coercivity on magnetic cobalt-platinum alloy films. / Su, C. W.; Shern, Ching-Song.

In: Journal of Magnetism and Magnetic Materials, Vol. 303, No. 2 SPEC. ISS., 01.01.2006.

Research output: Contribution to journalArticle

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abstract = "Ultrathin Co-Pt alloy films as substrate were studied by the surface magneto-optical Kerr effect. As the growth of Ni, the films show uniquely high polar Kerr responses without any in-plane signals. The coercivity decreased until the thickness of Ni film was higher than 5 ML. A new surface structure was discovered at 7-10 ML Ni/Co-Pt films by the low-energy electron diffraction. Interestingly, polar Kerr signal and coercivity of the 10 ML Ni/Co-Pt(1 1 1) template film reduced rapidly as Co films were further deposited onto only about 1-2 ML. Then the films show a canted magnetization with a rollback hysteresis in the polar configuration during the growth of Co. Coercivity of the 7 ML Co/Ni/Co-Pt film was found unusually down to almost 100 Oe.The corresponding magic number at around 7 ML of Co in the abnormal reduction of coercivity may be attributed to the cluster formations of Co.",
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N2 - Ultrathin Co-Pt alloy films as substrate were studied by the surface magneto-optical Kerr effect. As the growth of Ni, the films show uniquely high polar Kerr responses without any in-plane signals. The coercivity decreased until the thickness of Ni film was higher than 5 ML. A new surface structure was discovered at 7-10 ML Ni/Co-Pt films by the low-energy electron diffraction. Interestingly, polar Kerr signal and coercivity of the 10 ML Ni/Co-Pt(1 1 1) template film reduced rapidly as Co films were further deposited onto only about 1-2 ML. Then the films show a canted magnetization with a rollback hysteresis in the polar configuration during the growth of Co. Coercivity of the 7 ML Co/Ni/Co-Pt film was found unusually down to almost 100 Oe.The corresponding magic number at around 7 ML of Co in the abnormal reduction of coercivity may be attributed to the cluster formations of Co.

AB - Ultrathin Co-Pt alloy films as substrate were studied by the surface magneto-optical Kerr effect. As the growth of Ni, the films show uniquely high polar Kerr responses without any in-plane signals. The coercivity decreased until the thickness of Ni film was higher than 5 ML. A new surface structure was discovered at 7-10 ML Ni/Co-Pt films by the low-energy electron diffraction. Interestingly, polar Kerr signal and coercivity of the 10 ML Ni/Co-Pt(1 1 1) template film reduced rapidly as Co films were further deposited onto only about 1-2 ML. Then the films show a canted magnetization with a rollback hysteresis in the polar configuration during the growth of Co. Coercivity of the 7 ML Co/Ni/Co-Pt film was found unusually down to almost 100 Oe.The corresponding magic number at around 7 ML of Co in the abnormal reduction of coercivity may be attributed to the cluster formations of Co.

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