Beatrice Negulescu

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Publications

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History-dependent and frequency-dependent dielectric nonlinearities induced by polar nanoregions in a thin film of 0.5 ( Ba 0.7 Ca 0.3 TiO 3 ) − 0.5 ( BaZr 0.2 Ti 0.8 O 3 )

Kevin Nadaud , Guillaume Nataf , Nazir Jaber , Edgar Chaslin , Béatrice Negulescu et al.

Physical Review B, 2025, 112 (1), pp.014202. ⟨10.1103/fhdr-wn22⟩

Article dans une revue hal-05149785v1
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Compositionally graded Ba1− x Sr x TiO3 thin film for SIMS applications

J. Scola , J. Garcia , F. Jomard , E. Loire , J. Wolfman et al.

Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics, 2025, 43 (4), pp.044004. ⟨10.1116/6.0004549⟩

Article dans une revue hal-05172869v1

Enhancement of Piezoelectric Properties in a Narrow Cerium Doping Range of Ba<sub>1– x</sub>Ca<sub>x</sub>Ti<sub>1– y</sub>Zr<sub>y</sub>O<sub>3</sub> Evidenced by Combinatorial Experiment

Kevin Nadaud , Guillaume F. Nataf , Nazir Jaber , Béatrice Negulescu , Fabien Giovannelli et al.

ACS Applied Electronic Materials, 2024, 6 (10), pp.7392-7401. ⟨10.1021/acsaelm.4c01282⟩

Article dans une revue hal-04725247v1
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Subcoercive-field dielectric response of 0.5 (Ba 0.7 Ca 0.3 TiO 3 ) -0.5 (BaZr 0.2 Ti 0.8 O 3 ) thin film: peculiar third harmonic signature of phase transitions and residual ferroelectricity

Kevin Nadaud , Guillaume F Nataf , Nazir Jaber , Micka Bah , Béatrice Negulescu et al.

Applied Physics Letters, 2024, 124 (4), pp.042901. ⟨10.1063/5.0182718⟩

Article dans une revue hal-04410474v1
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A review on oxide/metal/oxide thin films on flexible substrates as electrodes for organic and perovskite solar cells

Mihaela Girtan , Beatrice Negulescu

Optical Materials: X, 2022, 13, pp.100122. ⟨10.1016/j.omx.2021.100122⟩

Article dans une revue hal-04048973v1
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Evaluation of Optical and Acoustical Properties of Ba1−xSrxTiO3 Thin Film Material Library via Conjugation of Picosecond Laser Ultrasonics with X-ray Diffraction, Energy Dispersive Spectroscopy, Electron Probe Micro Analysis, Scanning Electron and Atomic Force Microscopies

Sathyan Sandeep , Samuel Raetz , Jérôme Wolfman , Béatrice Negulescu , Guozhen Liu et al.

Nanomaterials, 2021, 11 (11), pp.3131. ⟨10.3390/nano11113131⟩

Article dans une revue hal-03566765v1
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Tunability investigation in the BaTiO3-CaTiO3-BaZrO3 phase diagram using a refined combinatorial thin film approach

Christophe Daumont , Quentin Simon , Sandrine Payan , Pascal Gardes , Patrick Poveda et al.

Coatings, 2021, 11 (9), pp.1082. ⟨10.3390/coatings11091082⟩

Article dans une revue hal-03391541v2
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Controlling the magnetoelectric coupling in Ni/BiFe0.95Mn0.05O3 with a dielectric spacer

Béatrice Negulescu , Jérôme Wolfman , Antoine Ruyter , Cécile Autret-Lambert , Salia Cherifi-Hertel

Journal of Magnetism and Magnetic Materials, 2021, 526, pp.167689. ⟨10.1016/j.jmmm.2020.167689⟩

Article dans une revue hal-03151050v1
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Strain-induced resistance change in V 2 O 3 films on piezoelectric ceramic disks

Joe Sakai , Maxime Bavencoffe , Béatrice Negulescu , Patrice Limelette , Jérôme Wolfman et al.

Journal of Applied Physics, 2019, 125 (11), pp.115102. ⟨10.1063/1.5083941⟩

Article dans une revue hal-02109266v1
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Structural and chemical investigation of interface related magnetoelectric effect in Ni/BiFe0.95Mn0.05O3 heterostructures

B. Negulescu , J. Wolfman , Christophe Daumont , Nazir Jaber , Pascal Andreazza et al.

Applied Surface Science, 2019, 481, pp.234-240. ⟨10.1016/j.apsusc.2019.02.232⟩

Article dans une revue hal-02070799v1
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Cyclable and non-volatile electric field control of magnetism in BiFeO 3 based magnetoelectric heterostructures

Christophe Daumont , Jérôme Wolfman , Cecile Autret , Pascal Andreazza , Béatrice Negulescu

Applied Physics Letters, 2018, 112 (11), pp.112401. ⟨10.1063/1.5018455⟩

Article dans une revue hal-01741590v1
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Modelling and experimental measurements of the mechanical response of piezoelectric structures from millimetre to micrometre

M. Bavencoffe , N. Tembhurnikar , B. Negulescu , J. Wolfman , G. Feuillard

Advances in Applied Ceramics, 2018, 117 (5), pp.285 - 290. ⟨10.1080/17436753.2018.1458475⟩

Article dans une revue hal-01842918v1
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Symmetry-state features in a global analysis of the temperature-dependent spin transport in Fe/MgO/Fe junctions

C. Bellouard , Y. Lu , A. Duluard , B. Negulescu , Christian Senet et al.

Physical Review B, 2018, 98 (14), pp.144437. ⟨10.1103/PhysRevB.98.144437⟩

Article dans une revue hal-02011330v1

Shape-controlled electrochemical synthesis of mesoporous Si/Fe nanocomposites with tailored ferromagnetic properties

Benjamin Bardet , Thomas Defforge , Beatrice Negulescu , Damien Valente , Jérôme Billoue et al.

Materials Chemistry Frontiers, 2017, 1 (1), pp.190 - 196. ⟨10.1039/c6qm00040a⟩

Article dans une revue hal-01741022v1
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Metalliclike behavior of the exchange coupling in (001) Fe/MgO/Fe junctions

C. Bellouard , A. Duluard , Etienne Snoeck , Y. Lu , B. Negulescu et al.

Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2017, 96 (13), pp.134416. ⟨10.1103/PhysRevB.96.134416⟩

Article dans une revue hal-01686936v1
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Nonlinear piezoelectric properties of epitaxial BaTiO 3 thin film

Béatrice Negulescu , Christophe Daumont , Joe Sakai , A. Ruyter , M. Bavencoffe et al.

Ferroelectrics, 2017, 514 (1), pp.9-18. ⟨10.1080/00150193.2017.1359027⟩

Article dans une revue hal-03573451v1

Structural, optical, magnetic and electrical properties of hematite (α-Fe2O3) nanoparticles synthesized by two methods: polyol and precipitation

Houda Mansour , Hanen Letifi , Radhouane Bargougui , Sonia de Almeida-Didry , Béatrice Negulescu et al.

Applied physics. A, Materials science & processing, 2017, 123 (12), ⟨10.1007/s00339-017-1408-1⟩

Article dans une revue hal-01741579v1
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Laser fluence and spot size effect on compositional and structural properties of BiFeO 3 thin films grown by Pulsed Laser Deposition

Nazir Jaber , Jérôme Wolfman , Christophe Daumont , Béatrice Negulescu , Antoine Ruyter et al.

Thin Solid Films, 2017, 634, pp.107 - 111. ⟨10.1016/j.tsf.2017.05.003⟩

Article dans une revue hal-01741587v1
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Study of oxide/metal/oxide thin films for transparent electronics and solar cells applications by spectroscopic ellipsometry

Mihaela Girtan , Laura Hrostea , Mihaela Boclinca , Beatrice Negulescu

AIMS Materials Science, 2017, 4 (3), pp.594 - 613. ⟨10.3934/matersci.2017.3.594⟩

Article dans une revue hal-01741580v1

Growth of polycrystalline Pr2NiO4+δ coating on alumina substrate by RF magnetron co-sputtering from composite targets

Amal Sediri , Mustapha Zaghrioui , A. Barichard , Cecile Autret , Béatrice Negulescu et al.

Thin Solid Films, 2016, 600, pp.131 - 135. ⟨10.1016/j.tsf.2016.01.023⟩

Article dans une revue istex hal-01741564v1

Local analysis of the grain and grain boundary contributions to the bulk dielectric properties of Ca(Cu 3−y Mg y )Ti 4 O 12 ceramics: Importance of the potential barrier at the grain boundary

Anoop Nautiyal , Cecile Autret , Christophe Honstettre , Sonia de Almeida-Didry , M. El Amrani et al.

Journal of the European Ceramic Society, 2016, 36 (6), pp.1391 - 1398. ⟨10.1016/j.jeurceramsoc.2015.12.035⟩

Article dans une revue istex hal-01741560v1
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Tunability, dielectric, and piezoelectric properties of Ba(1−x)CaxTi(1−y)ZryO3 ferroelectric thin films

Christophe Daumont , Quentin Simon , Erwan Le Mouellic , Sandrine Payan , Pascal Gardes et al.

Journal of Applied Physics, 2016, 119 (9), 094107 (8 p.). ⟨10.1063/1.4942924⟩

Article dans une revue hal-01309603v1
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Enhancement of piezoelectric response in Ga doped BiFeO 3 epitaxial thin films

Nazir Jaber , Jérôme Wolfman , Christophe Daumont , Béatrice Negulescu , Antoine Ruyter et al.

Journal of Applied Physics, 2015, 117 (24), ⟨10.1063/1.4923217⟩

Article dans une revue hal-01741553v1

Interfacial electronic transport phenomena in single crystalline Fe-MgO-Fe thin barrier junctions

R. B. Gangineni , Christine Bellouard , A. Duluard , B. Negulescu , C. Baraduc et al.

Applied Physics Letters, 2014, 104 (18), ⟨10.1063/1.4875386⟩

Article dans une revue hal-01282868v1
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Fe/MgO/Fe (100) textured tunnel junctions exhibiting spin polarization features of single crystal junctions

A. Duluard , Béatrice Negulescu , C. Bellouard , M. Hehn , D. Lacour et al.

Applied Physics Letters, 2012, 100 (7), ⟨10.1063/1.3687174⟩

Article dans une revue hal-01741538v1
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Giant spin-dependent thermoelectric effect in magnetic tunnel junctions

Weiwei Lin , Michel Hehn , Laurent Chaput , Béatrice Negulescu , Stéphane Andrieu et al.

Nature Communications, 2012, 3 (1), pp.744. ⟨10.1038/ncomms1748⟩

Article dans une revue hal-01741544v1
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On the control of spin flop in synthetic antiferromagnetic films

B. Negulescu , Daniel Lacour , M. Hehn , A. Gerken , J. Paul et al.

Journal of Applied Physics, 2011, 109 (10), pp.103911. ⟨10.1063/1.3583584⟩

Article dans une revue hal-01741526v1
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Impact of electron-electron interactions induced by disorder at interfaces on spin-dependent tunneling in Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions

J Bernos , M Hehn , F Montaigne , C Tiusan , D Lacour et al.

Physical Review B: Condensed Matter (1978-1997), 2010, 82, pp.060405. ⟨10.1103/PhysRevB.82.060405⟩

Article dans une revue hal-02949068v1
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Wide range and tunable linear TMR sensor using two exchange pinned electrodes

B. Negulescu , Daniel Lacour , F. Montaigne , A. Gerken , J. C. Paul et al.

Applied Physics Letters, 2009

Article dans une revue hal-00397879v1

Magnetization reversal of nanostructured tunnel junctions from prepatterned substrates

A. Bollero , V. Baltz , B. Dieny , B. Negulescu , M. Rickart et al.

Journal of Applied Physics, 2008, 103 (7), pp.07C108. ⟨10.1063/1.2830961⟩

Article dans une revue hal-00260807v1

Modeling and Predicting the Piezoelectric Properties of (Ba,Ca)(Zr,Ti)O3 Films with Composition Gradient Using Machine Learning

Hugo Kuentz , Béatrice Negulescu , Kevin Nadaud , Jérôme Wolfman , Koushik Dey

ISAF, Jul 2025, Graz, Austria

Communication dans un congrès hal-05142817v1

Modeling and predicting the piezoelectric properties of (Ba,Ca)(Zr,Ti)O3 (BCTZ) combinatorial PLD sample doped with cerium using machine learning

Hugo Kuentz , Jérôme Wolfman , Béatrice Negulescu , Kevin Nadaud

EMRS Spring Meeting 2025, May 2025, Strasboug, France

Communication dans un congrès hal-05137397v1

Piezoelectric Properties Enhancement by Continuous multi-Doping in lead-Free (Ba,Ca)(Ti,Zr)O3 Thin Films Libraries

Jérôme Wolfman , Kevin Nadaud , Hugo Kuentz , Koushik Dey , Béatrice Negulescu et al.

ISAF, Jul 2025, Graz, Austria

Communication dans un congrès hal-05142841v1

Study of the Dielectric non-Linearities in 0.5(Ba0.7Ca0.3TiO3)-0.5(BaZr0.2Ti0.8O3) Thin Film

Kevin Nadaud , Guillaume F. Nataf , Nazir Jaber , Béatrice Negulescu , Jérôme Wolfman

ISAF, Jul 2025, Graz, Austria

Communication dans un congrès hal-05142823v1

Study of the dielectric non-linearities in 0.5(Ba0.7Ca0.3TiO3)–0.5(BaZr0.2Ti0.8O3) thin film

Kevin Nadaud , Guillaume F. Nataf , Nazir Jaber , Béatrice Negulescu , Jérôme Wolfman

E-MRS Spring Meeting 2025, May 2025, Strasbourg, France

Communication dans un congrès hal-05120862v1
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SIMS analysis of an oxide thin film with continuous composition gradient

Joseph Scola , François Jomard , Jérôme Wolfman , Béatrice Negulescu , M.A. Pinault-Thaury

24th International Conference on Secondary Ion Mass Spectrometry (SIMS-24), Sep 2024, La Rochelle, France

Communication dans un congrès hal-04749447v1

Enhanced piezoelectricity properties and relaxor behaviour in (Ce, Y) co-doped BCTZ thin films libraries

Jérôme Wolfman , Kevin Nadaud , Beatrice Negulescu , Nazir Jaber , Fabien Giovannelli et al.

2024 ISAF, Sep 2024, Taipei, Taiwan

Communication dans un congrès hal-04794690v1

BCTZ lead free thin films with Ce doping gradient: enhanced piezoelectricity and relaxor behaviour

Jérôme Wolfman , Béatrice Negulescu , Kevin Nadaud , Guillaume F. Nataf , Nazir Jaber et al.

ECAPD 2024, Jun 2024, Trondheim, Norway

Communication dans un congrès hal-04794693v1

Interface Modulation to control dead layer effect and leakages in BST-based Varactors

Mudit Upadhyay , Béatrice Negulescu , Kevin Nadaud , Julien Varignon , Antoine Ruyter et al.

ISAF, Jul 2023, Cleveland, OH, United States

Communication dans un congrès hal-04254848v1

Controlling the Schottky Barrier height via polar discontinuity at (La,Sr)MnO3 / SrTiO3 interface

J. Wolfman , A. Ruyter , B. Negulescu , M. Upadhyay , P. Andreazza et al.

EMRS Spring 2023, May 2023, Strasboug, France

Communication dans un congrès hal-04253518v1

Reversible charge transfer and band bending at metal/oxide junction using interface combinatorial engineering

J. Wolfman , A. Ruyter , B. Negulescu , M. Upadhyay , P. Andreazza et al.

MRM2023/IUMRS-ICA2023 Grand Meeting, Dec 2023, Kyoto (Japan), Japan

Communication dans un congrès hal-04253500v1
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Interface control layer in BaySr1-yTiO3 based varactors for 5G technology

Santiago Alberto Agudelo Estrada , Nick Barrett , Christophe Lubin , Jérôme Wolfman , Béatrice Negulescu et al.

JNSPE 2023 - Journees Nationales Des Spectroscopies De Photoemission, May 2023, Sophia -Antipolis, France

Communication dans un congrès hal-05400366v1

Band structure and polar distortion tuning at (La,Sr)MnO3 / (Ba,Sr)TiO3 interface

J. Wolfman , A. Ruyter , B. Negulescu , Pascal Andreazza , X. Wallart et al.

IEEE ISAF 2022, Jun 2022, Tours (FR), France

Communication dans un congrès hal-04485893v1

Band structure tuning at (La,Sr)MnO3 / (Ba,Sr)TiO3 interface

Jérôme Wolfman , Antoine Ruyter , B. Negulescu , Pascal Andreazza , Xavier Wallart et al.

EMRS Spring 2022, May 2022, Virtual, France

Communication dans un congrès hal-03750429v1

(La,Sr)MnO3 / (Ba,Sr)TiO3 interface chemical modulation and band structure tuning

Jérôme Wolfman , Ruyter A. , Béatrice Negulescu , Andreazza P. , C. Autret-Lambert et al.

37th European Materials Research Society Spring Meeting, E-MRS Spring 2019, May 2019, Nice, France

Communication dans un congrès hal-04485931v1

Reduction and replacement of critical raw material used for transparent electrodes in flat screens, transparent electronics and solar cells

Mihaela Girtan , Béatrice Negulescu , Laura Hrostea , Mihaela Boclinca

EMRS-fall Meeting, 2017, Varsovie, Poland

Communication dans un congrès hal-02572829v1