Journal
THIN SOLID FILMS
Volume 603, Issue -, Pages 262-267Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2016.02.023
Keywords
Magnetron-sputtering; Combinatorial materials science; Magnetocaloric; Fe2P; FeP2; Photocatalytic
Categories
Funding
- DFG [SPP 1599]
- International Max Planck Research School for Surface and Interface Engineering (IMPRS-SurMat)
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Structural and magnetic properties of magnetron-sputtered Fe-P(-Mn) thin films with compositions around the Fe2P single phase region are reported, revealing the compositional range of the Fe2P-type structure and the change of the magnetic properties within this composition spread. The structural analysis shows that in order to obtain crystalline Fe-P phases the P content must be higher than (Fe0.97Mn0.03)(2.33)P. A maximum phase fraction of the Fe2P-type structure is obtained in the examined (Fe0.97Mn0.03)(1.78)P sample. The hysteresis loops for the Fe2P(-Mn) thin films show a two-step magnetic reversal with one part belonging to an amorphous phase fraction and the other to the Fe2P(-Mn) phase. A maximum coercivity of 0.36 T was measured for the Fe2P(-Mn) phase fraction also at the composition of (Fe0.97Mn0.03)(1.78)P. Furthermore, electrochemical properties of FeP2(-Mn) thin films as hydrogen evolution catalysts (HER) are studied. FeP2(-Mn) shows a HER onset potential about 200 mV lower than that of Pt. Chronoamperometric testing at -11.5 mA/cm(2) for over 3500 s revealed no obvious decay in current density, suggesting good stability under typical working conditions in a photoelectrochemical device. (C) 2016 Elsevier B.V. All rights reserved.
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