%0 Journal Article %1 ISI:000348155100005 %A Barbier, A. %A Aghavnian, T. %A Badjeck, V. %A Mocuta, C. %A Stanescu, D. %A Magnan, H. %A Rountree, C. L. %A Belkhou, R. %A Ohresser, P. %A Jedrecy, N. %C ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA %D 2015 %I AMER PHYSICAL SOC %J PHYSICAL REVIEW B %K imported iscpif %N 3 %R 10.1103/PhysRevB.91.035417 %T Antiferromagnetic long-range spin ordering in Fe- and NiFe2-doped BaTiO3 multiferroic layers %V 91 %X We report on the Fe doping and on the comparative Ni-Fe codoping with composition close to NiFe2 of fully oxidized BaTiO3 layers (similar to 20 nm) elaborated by atomic oxygen plasma assisted molecular beam epitaxy; specifically any role of oxygen vacancies can be excluded in our films. Additionally to the classical in situ laboratory tools, the films were thoroughly characterized by synchrotron radiation x-ray diffraction and x-ray absorption spectroscopy. For purely Fe-doped layers, the native tetragonal perovskite structure evolves rapidly toward cubiclike up to 5\% doping level above which the crystalline order disappears. On the contrary, low codoping levels (similar to 5\% NiFe2) fairly improve the thin film crystalline structure and surface smoothness; high levels (similar to 27\%) lead to more crystallographically disordered films, although the tetragonal structure is preserved. Synchrotron radiation magnetic dichroic measurements reveal that metal clustering does not occur, that the Fe valence evolves from Fe2+ for low Fe doping levels to Fe3+ for high doping levels, and that the introduction of Ni favors the occurrence of the Fe2+ valence in the films. For the lower codoping levels it seems that Fe2+ substitutes Ba2+, whereas Ni2+ always substitutes Ti4+. Ferromagnetic long-range ordering can be excluded with great sensitivity in all samples as deduced from our x-ray magnetic absorption circular dichroic measurements. On the contrary, our linear dichroic x-ray absorption results support antiferromagnetic long-range ordering while piezoforce microscopy gives evidence of a robust ferroelectric long-range ordering showing that our films are excellent candidates for magnetic exchange coupled multiferroic applications.

@article{ISI:000348155100005, abstract = {{We report on the Fe doping and on the comparative Ni-Fe codoping with composition close to NiFe2 of fully oxidized BaTiO3 layers (similar to 20 nm) elaborated by atomic oxygen plasma assisted molecular beam epitaxy; specifically any role of oxygen vacancies can be excluded in our films. Additionally to the classical in situ laboratory tools, the films were thoroughly characterized by synchrotron radiation x-ray diffraction and x-ray absorption spectroscopy. For purely Fe-doped layers, the native tetragonal perovskite structure evolves rapidly toward cubiclike up to 5\% doping level above which the crystalline order disappears. On the contrary, low codoping levels (similar to 5\% NiFe2) fairly improve the thin film crystalline structure and surface smoothness; high levels (similar to 27\%) lead to more crystallographically disordered films, although the tetragonal structure is preserved. Synchrotron radiation magnetic dichroic measurements reveal that metal clustering does not occur, that the Fe valence evolves from Fe2+ for low Fe doping levels to Fe3+ for high doping levels, and that the introduction of Ni favors the occurrence of the Fe2+ valence in the films. For the lower codoping levels it seems that Fe2+ substitutes Ba2+, whereas Ni2+ always substitutes Ti4+. Ferromagnetic long-range ordering can be excluded with great sensitivity in all samples as deduced from our x-ray magnetic absorption circular dichroic measurements. On the contrary, our linear dichroic x-ray absorption results support antiferromagnetic long-range ordering while piezoforce microscopy gives evidence of a robust ferroelectric long-range ordering showing that our films are excellent candidates for magnetic exchange coupled multiferroic applications.}}, added-at = {2015-05-15T21:46:32.000+0200}, address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}}, affiliation = {{Barbier, A (Reprint Author), CEA Saclay, CNRS UMR 3680, DSM IRAMIS SPEC, F-91191 Gif Sur Yvette, France. Barbier, A.; Aghavnian, T.; Badjeck, V.; Stanescu, D.; Magnan, H.; Rountree, C. L., CEA Saclay, CNRS UMR 3680, DSM IRAMIS SPEC, F-91191 Gif Sur Yvette, France. Aghavnian, T.; Mocuta, C.; Belkhou, R.; Ohresser, P., Synchrotron SOLEIL, F-91192 Gif Sur Yvette, France. Badjeck, V.; Jedrecy, N., Univ Paris 06, Univ Paris 04, UMR 7588, INSP, F-75005 Paris, France.}}, article-number = {{035417}}, author = {Barbier, A. and Aghavnian, T. and Badjeck, V. and Mocuta, C. and Stanescu, D. and Magnan, H. and Rountree, C. L. and Belkhou, R. and Ohresser, P. and Jedrecy, N.}, biburl = {https://www.bibsonomy.org/bibtex/2f0df1a2c6c36a9bf23e498a63bdae377/iscpif}, cited-references = {{{[}Anonymous], 1994, IEEE 5 INT S MICR HU, P75. Barbier A, 2005, PHYS REV B, V72, DOI 10.1103/PhysRevB.72.245423. Barbier A, 2012, J APPL PHYS, V112, DOI 10.1063/1.4768469. Bhatu SS, 2007, INDIAN J PURE AP PHY, V45, P596. Brice-Profeta S, 2005, J MAGN MAGN MATER, V288, P354, DOI 10.1016/j.jmmm.2004.09.120. Callender C, 2008, APPL PHYS LETT, V92, DOI 10.1063/1.2832768. Chart N.-H., 1982, J AM CERAM SOC, V65, P165. Chen LQ, 2008, J AM CERAM SOC, V91, P1835, DOI 10.1111/j.1551-2916.2008.02413.x. Chicot D, 2011, MATER CHEM PHYS, V129, P862, DOI 10.1016/j.matchemphys.2011.05.056. 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This work was partly supported by a CNano-MAEBA grant. This research work is supported by Triangle de la Physique and Ile-de-France (C'Nano and ISC-PIF) under the IMAFMP grants.}}, interhash = {e17f7a14306168f06fa8308c4f2ba143}, intrahash = {f0df1a2c6c36a9bf23e498a63bdae377}, issn = {{1098-0121}}, journal = {{PHYSICAL REVIEW B}}, journal-iso = {{Phys. Rev. B}}, keywords = {imported iscpif}, keywords-plus = {{X-RAY-ABSORPTION; THIN-FILMS; MAGNETIC-PROPERTIES; SPECTROSCOPY; SPINTRONICS; DICHROISM; NIFE2O4}}, language = {{English}}, month = {{JAN 14}}, number = {{3}}, number-of-cited-references = {{61}}, orcid-numbers = {{Rountree, Cindy/0000-0003-4349-7064}}, publisher = {{AMER PHYSICAL SOC}}, research-areas = {{Physics}}, researcherid-numbers = {{Rountree, Cindy/D-5430-2015}}, times-cited = {{0}}, timestamp = {2015-05-15T21:54:43.000+0200}, title = {{Antiferromagnetic long-range spin ordering in Fe- and NiFe2-doped BaTiO3 multiferroic layers}}, type = {{Article}}, unique-id = {{ISI:000348155100005}}, volume = {{91}}, web-of-science-categories = {{Physics, Condensed Matter}}, year = 2015 }