Beatrice Negulescu

Identifiants chercheurs

IdHAL :

negulescu-beatrice

ORCID :

0000-0001-7218-9859

IdRef :

077620925

Présentation

Publications

Article dans une revue (30)

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 Negulescuet al. Physical Review B, 2025, 112 (1), pp.014202. ⟨10.1103/fhdr-wn22⟩ Article dans une revue hal-05149785v1
Compositionally graded Ba1− x Sr x TiO3 thin film for SIMS applications J. Scola,J. Garcia,F. Jomard,E. Loire,J. Wolfmanet 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&lt;sub&gt;1– x&lt;/sub&gt;Ca&lt;sub&gt;x&lt;/sub&gt;Ti&lt;sub&gt;1– y&lt;/sub&gt;Zr&lt;sub&gt;y&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; Evidenced by Combinatorial Experiment Kevin Nadaud,Guillaume F. Nataf,Nazir Jaber,Béatrice Negulescu,Fabien Giovannelliet al. ACS Applied Electronic Materials, 2024, 6 (10), pp.7392-7401. ⟨10.1021/acsaelm.4c01282⟩ Article dans une revue hal-04725247v1
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 Negulescuet al. Applied Physics Letters, 2024, 124 (4), pp.042901. ⟨10.1063/5.0182718⟩ Article dans une revue hal-04410474v1
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
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 Liuet al. Nanomaterials, 2021, 11 (11), pp.3131. ⟨10.3390/nano11113131⟩ Article dans une revue hal-03566765v1
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 Povedaet al. Coatings, 2021, 11 (9), pp.1082. ⟨10.3390/coatings11091082⟩ Article dans une revue hal-03391541v2
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
Structural and chemical investigation of interface related magnetoelectric effect in Ni/BiFe0.95Mn0.05O3 heterostructures B. Negulescu,J. Wolfman,Christophe Daumont,Nazir Jaber,Pascal Andreazzaet al. Applied Surface Science, 2019, 481, pp.234-240. ⟨10.1016/j.apsusc.2019.02.232⟩ Article dans une revue hal-02070799v1
Strain-induced resistance change in V 2 O 3 films on piezoelectric ceramic disks Joe Sakai,Maxime Bavencoffe,Béatrice Negulescu,Patrice Limelette,Jérôme Wolfmanet al. Journal of Applied Physics, 2019, 125 (11), pp.115102. ⟨10.1063/1.5083941⟩ Article dans une revue hal-02109266v1
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
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
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 Senetet al. Physical Review B, 2018, 98 (14), pp.144437. ⟨10.1103/PhysRevB.98.144437⟩ Article dans une revue hal-02011330v1
Nonlinear piezoelectric properties of epitaxial BaTiO 3 thin film Béatrice Negulescu,Christophe Daumont,Joe Sakai,A. Ruyter,M. Bavencoffeet al. Ferroelectrics, 2017, 514 (1), pp.9-18. ⟨10.1080/00150193.2017.1359027⟩ Article dans une revue hal-03573451v1
Shape-controlled electrochemical synthesis of mesoporous Si/Fe nanocomposites with tailored ferromagnetic properties Benjamin Bardet,Thomas Defforge,Beatrice Negulescu,Damien Valente,Jérôme Billoueet al. Materials Chemistry Frontiers, 2017, 1 (1), pp.190 - 196. ⟨10.1039/c6qm00040a⟩ Article dans une revue hal-01741022v1
Metalliclike behavior of the exchange coupling in (001) Fe/MgO/Fe junctions C. Bellouard,A. Duluard,Etienne Snoeck,Y. Lu,B. Negulescuet 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
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 Negulescuet al. Applied physics. A, Materials science & processing, 2017, 123 (12), ⟨10.1007/s00339-017-1408-1⟩ Article dans une revue hal-01741579v1
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 Ruyteret al. Thin Solid Films, 2017, 634, pp.107 - 111. ⟨10.1016/j.tsf.2017.05.003⟩ Article dans une revue hal-01741587v1
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 Negulescuet al. Thin Solid Films, 2016, 600, pp.131 - 135. ⟨10.1016/j.tsf.2016.01.023⟩ Article dans une revue istex hal-01741564v1
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 Gardeset al. Journal of Applied Physics, 2016, 119 (9), 094107 (8 p.). ⟨10.1063/1.4942924⟩ Article dans une revue hal-01309603v1
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 Amraniet 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
Enhancement of piezoelectric response in Ga doped BiFeO 3 epitaxial thin films Nazir Jaber,Jérôme Wolfman,Christophe Daumont,Béatrice Negulescu,Antoine Ruyteret 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. Baraducet al. Applied Physics Letters, 2014, 104 (18), ⟨10.1063/1.4875386⟩ Article dans une revue hal-01282868v1
Giant spin-dependent thermoelectric effect in magnetic tunnel junctions Weiwei Lin,Michel Hehn,Laurent Chaput,Béatrice Negulescu,Stéphane Andrieuet al. Nature Communications, 2012, 3 (1), pp.744. ⟨10.1038/ncomms1748⟩ Article dans une revue hal-01741544v1
Fe/MgO/Fe (100) textured tunnel junctions exhibiting spin polarization features of single crystal junctions A. Duluard,Béatrice Negulescu,C. Bellouard,M. Hehn,D. Lacouret al. Applied Physics Letters, 2012, 100 (7), ⟨10.1063/1.3687174⟩ Article dans une revue hal-01741538v1
On the control of spin flop in synthetic antiferromagnetic films B. Negulescu,Daniel Lacour,M. Hehn,A. Gerken,J. Paulet al. Journal of Applied Physics, 2011, 109 (10), pp.103911. ⟨10.1063/1.3583584⟩ Article dans une revue hal-01741526v1
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 Lacouret al. Physical Review B: Condensed Matter (1978-1997), 2010, 82, pp.060405. ⟨10.1103/PhysRevB.82.060405⟩ Article dans une revue hal-02949068v1
Wide range and tunable linear TMR sensor using two exchange pinned electrodes B. Negulescu,Daniel Lacour,F. Montaigne,A. Gerken,J. C. Paulet 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. Rickartet al. Journal of Applied Physics, 2008, 103 (7), pp.07C108. ⟨10.1063/1.2830961⟩ Article dans une revue hal-00260807v1

Communication dans un congrès (16)

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 Negulescuet 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
Enhanced piezoelectricity properties and relaxor behaviour in (Ce, Y) co-doped BCTZ thin films libraries Jérôme Wolfman,Kevin Nadaud,Beatrice Negulescu,Nazir Jaber,Fabien Giovannelliet al. 2024 ISAF, Sep 2024, Taipei, Taiwan Communication dans un congrès hal-04794690v1
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
BCTZ lead free thin films with Ce doping gradient: enhanced piezoelectricity and relaxor behaviour Jérôme Wolfman,Béatrice Negulescu,Kevin Nadaud,Guillaume F. Nataf,Nazir Jaberet 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 Ruyteret 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. Andreazzaet 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. Andreazzaet al. MRM2023/IUMRS-ICA2023 Grand Meeting, Dec 2023, Kyoto (Japan), Japan Communication dans un congrès hal-04253500v1
Interface control layer in BaySr1-yTiO3 based varactors for 5G technology Santiago Alberto Agudelo Estrada,Nick Barrett,Christophe Lubin,Jérôme Wolfman,Béatrice Negulescuet 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. Wallartet 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 Wallartet 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-Lambertet 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

Poster de conférence (2)

Operando HAXPES analysis of permittivity and Schottky Barrier Height of Ba0.45Sr0.55TiO3 varactors Santiago Alberto Agudelo Estrada,Lucía Pérez Ramírez,Christophe Lubin,Jérôme Wolfman,Béatrice Negulescuet al. 10th International Conference on Hard X-ray Photoelectron Spectroscopy, Jun 2024, Pilsen, Czech Republic. Poster de conférence hal-05400249v1
Evidence of Ba-rich surface segregation in Ba1-xSrxTiO3and Ba-rich surfactant in SrTiO3/ Ba1-xSrxTiO3 stacks grown by combinatorial pulsed laser deposition Santiago Alberto Agudelo Estrada,Nick Barrett,Christophe Lubin,Jérôme Wolfman,Béatrice Negulescuet al. 2022 UFFC-S Ferroelectrics School, Jun 2022, Lyon, France. Poster de conférence hal-05400281v1

Chapitre d'ouvrage (1)

Interface combinatorial pulsed laser deposition to enhance heterostructures functional properties Jérôme Wolfman,Béatrice Negulescu,Antoine Ruyter,Ndioba Niang,Nazir Jaber Dr. Dongfang Yang. Practical Applications of Laser Ablation, , 2020, 978-1-83968-304-6. ⟨10.5772/intechopen.94415⟩ Chapitre d'ouvrage hal-03038828v3

Pré-publication, Document de travail (1)

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 Negulescuet al. 2023 Pré-publication, Document de travail (preprint/prepublication) hal-04259437v1