Hydrogen-mediated long-range magnetic ordering in Pd-rich alloy film

Wen Chin Lin; Cheng Jui Tsai; Han Yuan Huang; Bo Yao Wang; Venkata Ramana Mudinepalli; Hsiang Chih Chiu

doi:10.1063/1.4905463

Hydrogen-mediated long-range magnetic ordering in Pd-rich alloy film

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

32 Citations (Scopus)

Abstract

The effect of hydrogenation on a 14 nm Co₁₄Pd₈₆/Al₂O₃(0001) thin film was investigated on the basis of the magnetooptical Kerr effect. After exposure to H₂ gas, the squareness of the hysteresis loop showed a large transition from approximately 10% to 100% and the saturation Kerr signal was reduced to nearly 30% of the pristine value. The reversibility of the transition was verified and the response time was within 2-3 s. These observations indicate that the hydride formation transformed the short-range coupled and disordered magnetic state of the Co₁₄Pd₈₆ film to a long-range-ordered ferromagnetic state and induced appreciable decrease in the magnetic moment. The enhanced long-range-ordering and the reduction of the magnetic moment were attributed to the change of electronic structure in Co₁₄Pd₈₆ with hydrogen uptake.

Original language	English
Article number	012404
Journal	Applied Physics Letters
Volume	106
Issue number	1
DOIs	https://doi.org/10.1063/1.4905463
Publication status	Published - 2015 Jan 5

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Hydrogen-mediated long-range magnetic ordering in Pd-rich alloy film",

abstract = "The effect of hydrogenation on a 14 nm Co14Pd86/Al2O3(0001) thin film was investigated on the basis of the magnetooptical Kerr effect. After exposure to H2 gas, the squareness of the hysteresis loop showed a large transition from approximately 10% to 100% and the saturation Kerr signal was reduced to nearly 30% of the pristine value. The reversibility of the transition was verified and the response time was within 2-3 s. These observations indicate that the hydride formation transformed the short-range coupled and disordered magnetic state of the Co14Pd86 film to a long-range-ordered ferromagnetic state and induced appreciable decrease in the magnetic moment. The enhanced long-range-ordering and the reduction of the magnetic moment were attributed to the change of electronic structure in Co14Pd86 with hydrogen uptake.",

author = "Lin, {Wen Chin} and Tsai, {Cheng Jui} and Huang, {Han Yuan} and Wang, {Bo Yao} and Mudinepalli, {Venkata Ramana} and Chiu, {Hsiang Chih}",

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AU - Lin, Wen Chin

AU - Tsai, Cheng Jui

AU - Huang, Han Yuan

AU - Wang, Bo Yao

AU - Mudinepalli, Venkata Ramana

AU - Chiu, Hsiang Chih

PY - 2015/1/5

Y1 - 2015/1/5

N2 - The effect of hydrogenation on a 14 nm Co14Pd86/Al2O3(0001) thin film was investigated on the basis of the magnetooptical Kerr effect. After exposure to H2 gas, the squareness of the hysteresis loop showed a large transition from approximately 10% to 100% and the saturation Kerr signal was reduced to nearly 30% of the pristine value. The reversibility of the transition was verified and the response time was within 2-3 s. These observations indicate that the hydride formation transformed the short-range coupled and disordered magnetic state of the Co14Pd86 film to a long-range-ordered ferromagnetic state and induced appreciable decrease in the magnetic moment. The enhanced long-range-ordering and the reduction of the magnetic moment were attributed to the change of electronic structure in Co14Pd86 with hydrogen uptake.

AB - The effect of hydrogenation on a 14 nm Co14Pd86/Al2O3(0001) thin film was investigated on the basis of the magnetooptical Kerr effect. After exposure to H2 gas, the squareness of the hysteresis loop showed a large transition from approximately 10% to 100% and the saturation Kerr signal was reduced to nearly 30% of the pristine value. The reversibility of the transition was verified and the response time was within 2-3 s. These observations indicate that the hydride formation transformed the short-range coupled and disordered magnetic state of the Co14Pd86 film to a long-range-ordered ferromagnetic state and induced appreciable decrease in the magnetic moment. The enhanced long-range-ordering and the reduction of the magnetic moment were attributed to the change of electronic structure in Co14Pd86 with hydrogen uptake.

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Hydrogen-mediated long-range magnetic ordering in Pd-rich alloy film

Abstract

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