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Dong, Minjie
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Publications (5 of 5) Show all publications
Liu, L., Huang, S., Vitos, L., Dong, M., Bykova, E., Zhang, D., . . . Lazor, P. (2019). Pressure-induced magnetovolume effect in CoCrFeAl high-entropy alloy. Communications Physics, 2, Article ID 42.
Open this publication in new window or tab >>Pressure-induced magnetovolume effect in CoCrFeAl high-entropy alloy
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2019 (English)In: Communications Physics, E-ISSN 2399-3650, Vol. 2, article id 42Article in journal (Refereed) Published
Abstract [en]

High-entropy alloys (HEAs) composed of multiple-principal elements with (nearly) equimolar ratio establish a new conceptual framework for alloy design and hold a promise for extensive applications in industry, akin to the controlled expansion alloys (CEAs), such as Invar alloys. Spontaneously, one question emerges - would it be possible to synthesize a novel class of alloys combining the virtues of both CEAs and HEAs? Here, we report the pressure-induced magnetovolume effect in the body-centered-cubic CoCrFeAl HEA coupled with magnetic phase transitions from ferromagnetic to paramagnetic, and to non-magnetic states, originating from the successive collapses of local magnetic moments of Co and Fe. The observed magnetovolume anomalies, occurring in a progressive way, tailor appreciably the coefficient of thermal expansion of CoCrFeAl. These results further strengthen HEAs’ anticipated potential for designing multifunctional materials in virtue of their multiple outstanding properties, and reveal possible routes for their future synthesis.

National Category
Condensed Matter Physics Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-382796 (URN)10.1038/s42005-019-0141-9 (DOI)000467220700001 ()
Available from: 2019-05-03 Created: 2019-05-03 Last updated: 2019-06-10Bibliographically approved
Sanchez-Gonzalez, A., Micaelli, P., Olivier, C., Barillot, T. R., Ilchen, M., Lutman, A. A., . . . Marangos, J. P. (2017). Accurate prediction of X-ray pulse properties from a free-electron laser using machine learning. Nature Communications, 8, Article ID 15461.
Open this publication in new window or tab >>Accurate prediction of X-ray pulse properties from a free-electron laser using machine learning
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2017 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 8, article id 15461Article in journal (Refereed) Published
Abstract [en]

Free-electron lasers providing ultra-short high-brightness pulses of X-ray radiation have great potential for a wide impact on science, and are a critical element for unravelling the structural dynamics of matter. To fully harness this potential, we must accurately know the X-ray properties: intensity, spectrum and temporal profile. Owing to the inherent fluctuations in free-electron lasers, this mandates a full characterization of the properties for each and every pulse. While diagnostics of these properties exist, they are often invasive and many cannot operate at a high-repetition rate. Here, we present a technique for circumventing this limitation. Employing a machine learning strategy, we can accurately predict X-ray properties for every shot using only parameters that are easily recorded at high-repetition rate, by training a model on a small set of fully diagnosed pulses. This opens the door to fully realizing the promise of next-generation high-repetition rate X-ray lasers.

Place, publisher, year, edition, pages
Nature Publishing Group, 2017
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-327226 (URN)10.1038/ncomms15461 (DOI)000402745000001 ()28580940 (PubMedID)
Available from: 2017-08-25 Created: 2017-08-25 Last updated: 2017-11-29Bibliographically approved
Sanchez-Gonzalez, A., Barillot, T. R., Squibb, R. J., Kolorenc, P., Agåker, M., Averbukh, V., . . . Marangos, J. P. (2015). Auger Electron and Photoabsorption Spectra of Glycine in the Vicinity of the Oxygen K-edge Measured with an X-FEL. Journal of Physics B: Atomic, Molecular and Optical Physics, 48(23), Article ID 234004.
Open this publication in new window or tab >>Auger Electron and Photoabsorption Spectra of Glycine in the Vicinity of the Oxygen K-edge Measured with an X-FEL
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2015 (English)In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 48, no 23, article id 234004Article in journal (Refereed) Published
Abstract [en]

We report the first measurement of the near oxygen K-edge auger spectrum of the glycine molecule. Our work employed an x-ray free electron laser as the photon source operated with input photon energies tunable between 527 and 547 eV. Complete electron spectra were recorded at each photon energy in the tuning range, revealing resonant and non-resonant auger structures. Finally ab initio theoretical predictions are compared with the measured above the edge auger spectrum and an assignment of auger decay channels is performed.

Keywords
X-FEL, auger electron, glycine, oxygen, ab initio calculation
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-270416 (URN)10.1088/0953-4075/48/23/234004 (DOI)000365240900005 ()
Available from: 2016-03-14 Created: 2015-12-28 Last updated: 2018-06-26
Rudolf, D., Bussmann, J., Odstrcil, M., Dong, M., Bergmann, K., Danylyuk, S. & Juschkin, L. (2015). Interferometric broadband Fourier spectroscopy with a partially coherent gas-discharge extreme ultraviolet light source. Optics Letters, 40(12), 2818-2821
Open this publication in new window or tab >>Interferometric broadband Fourier spectroscopy with a partially coherent gas-discharge extreme ultraviolet light source
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2015 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 40, no 12, p. 2818-2821Article in journal (Refereed) Published
Abstract [en]

Extreme ultraviolet (EUV) spectroscopy is a powerful tool for studying fundamental processes in plasmas as well as for spectral characterization of EUV light sources and EUV optics. However, a simultaneous measurement covering a broadband spectral range is difficult to realize. Here, we propose a method for interferometric broadband Fourier spectroscopy connecting soft x ray and visible spectral ranges with moderate spectral resolution. We present an analytical model to recover the spectrum from a double-slit interferogram. We apply our model for spectral characterization of a partially coherent gas-discharge EUV light source operated with different gases in the spectral range between 10 and 110 nm wavelengths. Our approach allows a simple and fast broadband spectroscopy with fully or partially spatially coherent light sources, for instance, to characterize out-of-band radiation in EUV lithography applications.

National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:uu:diva-257642 (URN)10.1364/OL.40.002818 (DOI)000356234300037 ()26076270 (PubMedID)
Available from: 2015-07-09 Created: 2015-07-06 Last updated: 2017-12-04Bibliographically approved
Ekholm, V., Gråsjö, J., Dong, M., Björneholm, O., Såthe, C., Chatzigeorgiou, E., . . . Rubensson, J.-E.Aqueous carbonate and bicarbonate ions studied by RIXS at the O K-edge.
Open this publication in new window or tab >>Aqueous carbonate and bicarbonate ions studied by RIXS at the O K-edge
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(English)Manuscript (preprint) (Other academic)
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:uu:diva-359428 (URN)
Available from: 2018-09-02 Created: 2018-09-02 Last updated: 2018-09-02
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