Hydrogen absorption-induced reversible change in magnetic properties of Co-Pd alloy films

Wen Chin Lin, Bo-Yao Wang, Han Yuan Huang, Cheng Jui Tsai, Venkata Ramana Mudinepalli

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The effects of reversible hydrogen absorption on the magnetism of Co-Pd alloy thin films were investigated. Evident enhancement of magnetic coercivity Hc and squareness, measured by magneto optical Kerr effect (MOKE), was observed in the magnetic hysteresis loops of films with Pd content of 61%, 76%, and 86%, whereas no observable changes were noted in the MOKE hysteresis loops of Co-rich alloy films. For Co39 Pd61, perpendicular magnetic anisotropy increased as film thickness increased from 10 to 20 nm. Hydrogenation induced three times enhancement of perpendicular Hc for 20 nm Co39 Pd61, whereas the Hc change in 10 nm Co39 Pd61 was within 10%. A Pd-rich alloy composition and appropriate film thickness for perpendicular magnetization are both crucial for hydrogen absorption-induced effect on magnetic properties, i.e. the enhancement of Hc and squareness as well as the reduction of Kerr rotation angle.

Original languageEnglish
Pages (from-to)20-26
Number of pages7
JournalJournal of Alloys and Compounds
Volume661
DOIs
Publication statusPublished - 2016 Mar 15

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Optical Kerr effect
Hydrogen
Magnetic properties
Hysteresis loops
Film thickness
Magnetic hysteresis
Magnetic anisotropy
Magnetism
Coercive force
Hydrogenation
Magnetization
Thin films
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Lin, Wen Chin ; Wang, Bo-Yao ; Huang, Han Yuan ; Tsai, Cheng Jui ; Mudinepalli, Venkata Ramana. / Hydrogen absorption-induced reversible change in magnetic properties of Co-Pd alloy films. In: Journal of Alloys and Compounds. 2016 ; Vol. 661. pp. 20-26.
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abstract = "The effects of reversible hydrogen absorption on the magnetism of Co-Pd alloy thin films were investigated. Evident enhancement of magnetic coercivity Hc and squareness, measured by magneto optical Kerr effect (MOKE), was observed in the magnetic hysteresis loops of films with Pd content of 61{\%}, 76{\%}, and 86{\%}, whereas no observable changes were noted in the MOKE hysteresis loops of Co-rich alloy films. For Co39 Pd61, perpendicular magnetic anisotropy increased as film thickness increased from 10 to 20 nm. Hydrogenation induced three times enhancement of perpendicular Hc for 20 nm Co39 Pd61, whereas the Hc change in 10 nm Co39 Pd61 was within 10{\%}. A Pd-rich alloy composition and appropriate film thickness for perpendicular magnetization are both crucial for hydrogen absorption-induced effect on magnetic properties, i.e. the enhancement of Hc and squareness as well as the reduction of Kerr rotation angle.",
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Hydrogen absorption-induced reversible change in magnetic properties of Co-Pd alloy films. / Lin, Wen Chin; Wang, Bo-Yao; Huang, Han Yuan; Tsai, Cheng Jui; Mudinepalli, Venkata Ramana.

In: Journal of Alloys and Compounds, Vol. 661, 15.03.2016, p. 20-26.

Research output: Contribution to journalArticle

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AU - Wang, Bo-Yao

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AU - Tsai, Cheng Jui

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AB - The effects of reversible hydrogen absorption on the magnetism of Co-Pd alloy thin films were investigated. Evident enhancement of magnetic coercivity Hc and squareness, measured by magneto optical Kerr effect (MOKE), was observed in the magnetic hysteresis loops of films with Pd content of 61%, 76%, and 86%, whereas no observable changes were noted in the MOKE hysteresis loops of Co-rich alloy films. For Co39 Pd61, perpendicular magnetic anisotropy increased as film thickness increased from 10 to 20 nm. Hydrogenation induced three times enhancement of perpendicular Hc for 20 nm Co39 Pd61, whereas the Hc change in 10 nm Co39 Pd61 was within 10%. A Pd-rich alloy composition and appropriate film thickness for perpendicular magnetization are both crucial for hydrogen absorption-induced effect on magnetic properties, i.e. the enhancement of Hc and squareness as well as the reduction of Kerr rotation angle.

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