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Hard x-ray standing...
Hard x-ray standing-wave photoemission insights into the structure of an epitaxial Fe/MgO multilayer magnetic tunnel junction
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- Conlon, C. S. (author)
- Univ Calif Davis, Dept Phys, Davis, CA 95616 USA;Lawrence Berkeley Natl Lab, Mat Sci Div, Berkeley, CA 94720 USA
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- Conti, G. (author)
- Univ Calif Davis, Dept Phys, Davis, CA 95616 USA;Lawrence Berkeley Natl Lab, Mat Sci Div, Berkeley, CA 94720 USA
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- Nemsak, S. (author)
- Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA
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- Pálsson, Gunnar K. (author)
- Uppsala universitet,Materialfysik
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- Moubah, Reda (author)
- Uppsala universitet,Materialfysik
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- Kuo, C. -T (author)
- Department of Physics, University of California, Davis, Davis, California 95616, USA; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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- Gehlmann, M. (author)
- Univ Calif Davis, Dept Phys, Davis, CA 95616 USA;Lawrence Berkeley Natl Lab, Mat Sci Div, Berkeley, CA 94720 USA
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- Ciston, J. (author)
- Lawrence Berkeley Natl Lab, Mol Foundry, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA
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- Rault, J. (author)
- SOLEIL Synchrotron, F-91190 St Aubin, France
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- Rueff, J. -P (author)
- SOLEIL Synchrotron, 91190 Saint-Aubin, France; Sorbonne Université, CNRS, Laboratoire de Chimie Physique-Matière et Rayonnement (LCPMR), F-75005 Paris, France
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- Salmassi, F. (author)
- Lawrence Berkeley Natl Lab, Ctr Xray Opt, Berkeley, CA 94720 USA
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- Stolte, W. (author)
- Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA
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- Rattanachata, A. (author)
- Univ Calif Davis, Dept Phys, Davis, CA 95616 USA;Lawrence Berkeley Natl Lab, Mat Sci Div, Berkeley, CA 94720 USA
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- Lin, S. -C (author)
- Department of Physics, University of California, Davis, Davis, California 95616, USA; Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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- Keqi, A. (author)
- Univ Calif Davis, Dept Phys, Davis, CA 95616 USA;Lawrence Berkeley Natl Lab, Mat Sci Div, Berkeley, CA 94720 USA
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- Saw, A. (author)
- Univ Calif Davis, Dept Phys, Davis, CA 95616 USA;Lawrence Berkeley Natl Lab, Mat Sci Div, Berkeley, CA 94720 USA
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- Hjörvarsson, Björgvin (author)
- Uppsala universitet,Materialfysik
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- Fadley, C. S. (author)
- Univ Calif Davis, Dept Phys, Davis, CA 95616 USA;Lawrence Berkeley Natl Lab, Mat Sci Div, Berkeley, CA 94720 USA
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(creator_code:org_t)
- AIP Publishing, 2019
- 2019
- English.
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In: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 126:7
- Related links:
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http://arxiv.org/pdf...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- The Fe/MgO magnetic tunnel junction is a classic spintronic system, with current importance technologically and interest for future innovation. The key magnetic properties are linked directly to the structure of hard-to-access buried interfaces, and the Fe and MgO components near the surface are unstable when exposed to air, making a deeper probing, nondestructive, in-situ measurement ideal for this system. We have thus applied hard x-ray photoemission spectroscopy (HXPS) and standing-wave (SW) HXPS in the few kilo-electron-volt energy range to probe the structure of an epitaxially grown MgO/Fe superlattice. The superlattice consists of 9 repeats of MgO grown on Fe by magnetron sputtering on an MgO(001) substrate, with a protective Al2O3 capping layer. We determine through SW-HXPS that 8 of the 9 repeats are similar and ordered, with a period of 33 +/- 4 angstrom, with the minor presence of FeO at the interfaces and a significantly distorted top bilayer with ca. 3 times the oxidation of the lower layers at the top MgO/Fe interface. There is evidence of asymmetrical oxidation on the top and bottom of the Fe layers. We find agreement with dark-field scanning transmission electron microscope (STEM) and x-ray reflectivity measurements. Through the STEM measurements, we confirm an overall epitaxial stack with dislocations and warping at the interfaces of ca. 5 angstrom. We also note a distinct difference in the top bilayer, especially MgO, with possible Fe inclusions. We thus demonstrate that SW-HXPS can be used to probe deep buried interfaces of novel magnetic devices with few-angstrom precision.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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- ref (subject category)
- art (subject category)
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- By the author/editor
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Conlon, C. S.
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Conti, G.
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Nemsak, S.
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Pálsson, Gunnar ...
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Moubah, Reda
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Kuo, C. -T
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show more...
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Gehlmann, M.
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Ciston, J.
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Rault, J.
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Rueff, J. -P
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Salmassi, F.
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Stolte, W.
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Rattanachata, A.
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Lin, S. -C
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Keqi, A.
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Saw, A.
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Hjörvarsson, Bjö ...
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Fadley, C. S.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Condensed Matter ...
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Uppsala University