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Unravelling oxygen driven α to β phase transformation in tungsten

Abstract : Thin films of β-W are the most interesting for manipulating magnetic moments using spin–orbit torques, and a clear understanding of α to β phase transition in W by doping impurity, especially oxygen, is needed. Here we present a combined experimental and theoretical study using grazing incidence X-ray diffraction, photoelectron spectroscopy, electron microscopy, and ab initio calculations to explore atomic structure, bonding, and oxygen content for understanding the formation of β-W. It is found that the W films on SiO2/Si have 13–22 at.% oxygen in A15 β structure. Ab initio calculations show higher solution energy of oxygen in β-W, and a tendency to transform locally from α to β phase with increasing oxygen concentration. X-ray absorption spectroscopy also revealed local geometry of oxygen in β-W, in agreement with the simulated one. These results offer an opportunity for a fundamental understanding of the structural transition in α-W and further development of β-W phase for device applications.
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Submitted on : Thursday, November 19, 2020 - 7:47:17 PM
Last modification on : Wednesday, April 7, 2021 - 10:26:02 AM

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Ananya Chattaraj, Mohammad Balal, Ashok Kumar Yadav, Sudipta Roy Barman, Anil Kumar Sinha, et al.. Unravelling oxygen driven α to β phase transformation in tungsten. Scientific Reports, Nature Publishing Group, 2020, 10, pp.14718. ⟨10.1038/s41598-020-71650-2⟩. ⟨hal-03015420⟩

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