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

The effect of hydrogenation on a 14 nm Co{sub 14}Pd{sub 86}/Al{sub 2}O{sub 3}(0001) thin film was investigated on the basis of the magnetooptical Kerr effect. After exposure to H{sub 2} 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 Co{sub 14}Pd{sub 86} 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 Co{sub 14}Pd{sub 86} with hydrogen uptake.
Authors:
; ; ; ;  [1] ;  [2]
  1. Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan (China)
  2. Department of Physics, National Changhua University of Education, Changhua 500, Taiwan (China)
Publication Date:
OSTI Identifier:
22395654
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ALUMINIUM OXIDES; APPROXIMATIONS; COBALT ALLOYS; CRYSTAL STRUCTURE; ELECTRONIC STRUCTURE; FERROMAGNETISM; HYDRIDES; HYDROGEN; HYDROGENATION; HYSTERESIS; KERR EFFECT; MAGNETIC MOMENTS; MAGNETIZATION; PALLADIUM BASE ALLOYS; THIN FILMS