J. Wang, J. B. Neaton, H. Zheng, V. Nagarajan, S. B. Ogale et al., Epitaxial BiFeO3 Multiferroic Thin Film Heterostructures, Science, vol.299, issue.5613, p.1719, 2003.
DOI : 10.1126/science.1080615

D. Lee, R. K. Behera, P. Wu, H. Xu, Y. Li et al., ferroelectric domain walls, Physical Review B, vol.80, issue.6, p.60102, 2009.
DOI : 10.1103/PhysRevB.80.060102

W. J. Merz, Single Crystals, Physical Review, vol.95, issue.3, p.690, 1954.
DOI : 10.1103/PhysRev.95.690

J. Seidel, L. W. Martin, Q. He, Q. Zhan, Y. Chu et al., Conduction at domain walls in oxide multiferroics, Nature Materials, vol.9, issue.3, p.229, 2009.
DOI : 10.1038/nmat2373

I. Dzyaloshinskii, On the magneto-electrical eect in antiferromagnets, 1960.

G. Smolenskii and I. Chupis, Ferroelectromagnets, Soviet Physics Uspekhi, vol.25, issue.7, p.475, 1982.
DOI : 10.1070/PU1982v025n07ABEH004570

C. A. Vaz, J. Homan, C. H. Ahn, and R. Ramesh, Magnetoelectric Coupling Effects in Multiferroic Complex Oxide Composite Structures, Advanced Materials, vol.2, issue.34, p.2900, 2010.
DOI : 10.1002/adma.200904326

M. Fiebig, Revival of the magnetoelectric effect, Journal of Physics D: Applied Physics, vol.38, issue.8, p.123, 2005.
DOI : 10.1088/0022-3727/38/8/R01

H. Zheng, J. Wang, S. Loand, Z. Ma, L. Mohaddes-ardabili et al., Multiferroic BaTiO3-CoFe2O4 Nanostructures, Science, vol.303, issue.5658, p.661, 2004.
DOI : 10.1126/science.1094207

W. Eerenstein, N. Mathur, and J. F. Scott, Multiferroic and magnetoelectric materials, Nature, vol.72, issue.3, p.759, 2006.
DOI : 10.1016/S0304-8853(99)00289-9

K. Sone, S. Sekiguchi, H. Naganuma, T. Miyazaki, T. Nakajima et al., matrix, Journal of Applied Physics, vol.111, issue.12, p.124101, 2012.
DOI : 10.1063/1.4729831

C. Nan, M. Bichurin, S. Dong, D. Viehland, and G. Srinivasan, Multiferroic magnetoelectric composites: Historical perspective, status, and future directions, Journal of Applied Physics, vol.103, issue.3, p.31101, 2008.
DOI : 10.1063/1.2836410

A. Barbier, T. Aghavnian, V. Badjeck, C. Mocuta, D. Stanescu et al., multiferroic layers, Physical Review B, vol.91, issue.3, p.35417, 2015.
DOI : 10.1103/PhysRevB.91.035417

URL : https://hal.archives-ouvertes.fr/hal-01237448

A. Chen and Y. Zhao, Research Update: Electrical manipulation of magnetism through strain-mediated magnetoelectric coupling in multiferroic heterostructures, APL Materials, vol.4, issue.3, p.32303, 2016.
DOI : 10.1063/1.4943990

S. Zhang, Y. Zhao, P. Li, J. Yang, S. Rizwan et al., Structure at Room Temperature, Physical Review Letters, vol.108, issue.13, p.137203, 2012.
DOI : 10.1103/PhysRevLett.108.137203

T. Koyama, H. Hata, K. Kim, T. Moriyama, H. Tanigawa et al., Current-Induced Magnetic Domain Wall Motion in a Co/Ni Nanowire with Structural Inversion Asymmetry, Applied Physics Express, vol.6, issue.3, p.33001, 2013.
DOI : 10.7567/APEX.6.033001

Y. Cho, S. Hashimoto, N. Odagawa, K. Tanaka, and Y. Hiranaga, Nanodomain manipulation for ultrahigh density ferroelectric data storage, Nanotechnology, vol.17, issue.7, p.137, 2006.
DOI : 10.1088/0957-4484/17/7/S06

M. Bibes and A. Barthélémy, Multiferroics: Towards a magnetoelectric memory, Nature Materials, vol.43, issue.6, p.425, 2008.
DOI : 10.1038/nmat2189

J. Dionot, Topology of ferroelectric polarization at the BaTiO3 (001) surface from ab initio calculations and electron microscopy-spectroscopy, 2015.
URL : https://hal.archives-ouvertes.fr/tel-01243180

Z. Li, S. Chan, M. Grimsditch, and E. Zouboulis, single crystals, Journal of Applied Physics, vol.70, issue.12, p.7327, 1991.
DOI : 10.1063/1.349751

URL : https://hal.archives-ouvertes.fr/hal-01382699

A. Barbier, C. Mocuta, D. Stanescu, P. Jegou, N. Jedrecy et al., Surface composition of BaTiO3/SrTiO3(001) films grown by atomic oxygen plasma assisted molecular beam epitaxy, Journal of Applied Physics, vol.112, issue.11, p.114116, 2012.
DOI : 10.1063/1.4768469

URL : https://hal.archives-ouvertes.fr/hal-01237473

K. J. Choi, M. Biegalski, Y. Li, A. Sharan, J. Schubert et al., Enhancement of Ferroelectricity in Strained BaTiO3 Thin Films, Science, vol.306, issue.5698, p.1005, 2004.
DOI : 10.1126/science.1103218

S. Matzen, Films ultraminces épitaxiés de MnFe2O4, CoFe2O4 et NiFe2O4 pour le ltrage de spin à température ambiante, 2011.

Z. Li, E. Fisher, J. Liu, and M. Nevitt, Single-crystal elastic constants of Co-Al and Co-Fe spinels, Journal of Materials Science, vol.29, issue.10, p.2621, 1991.
DOI : 10.1007/BF02387728

S. Djaziri, Élasticité et endommagement sous chargement bi-axial de nano-composites W/Cuen couches minces sur polyimide: apport des techniques synchrotrons, 2012.

M. Leroy, Films minces épitaxiés de chrome pour l électronique de spin: propriétés de volume: d interface, 2013.

S. Cheri, R. Hertel, S. Fusil, H. Béa, K. Bouzehouane et al., Imaging ferroelectric domains in multiferroics using a low-energy electron microscope in the mirror operation mode, physica status solidi (RRL) - Rapid Research Letters, vol.72, issue.1-2, p.22, 2010.
DOI : 10.1002/pssr.200903297

G. Schütz, W. Wagner, W. Wilhelm, P. Kienle, R. Zeller et al., Absorption of circularly polarized x rays in iron, Physical Review Letters, vol.58, issue.7, p.737, 1987.
DOI : 10.1103/PhysRevLett.58.737

C. Chen, Y. Idzerda, H. Lin, N. Smith, E. Meigs et al., Experimental Confirmation of the X-Ray Magnetic Circular Dichroism Sum Rules for Iron and Cobalt, Physical Review Letters, vol.75, issue.1, p.152, 1995.
DOI : 10.1103/PhysRevLett.75.152

J. Stöhr, H. Padmore, S. Anders, T. Stammler, and M. Scheinfein, Principles of X-Ray Magnetic Dichroism Spectromicroscopy, Surface Review and Letters, vol.05, issue.06, p.1297, 1998.
DOI : 10.1142/S0218625X98001638

T. Jungk, Á. Homann, and E. Soergel, Quantitative analysis of ferroelectric domain imaging with piezoresponse force microscopy, Applied Physics Letters, vol.89, issue.16, p.163507, 2006.
DOI : 10.1063/1.2362984

S. V. Kalinin, A. N. Morozovska, L. Q. Chen, and B. J. Rodriguez, Local polarization dynamics in ferroelectric materials, Reports on Progress in Physics, vol.73, issue.5, p.56502, 2010.
DOI : 10.1088/0034-4885/73/5/056502

A. Ramos, J. Moussy, M. Guittet, M. Gautier-soyer, C. Gatel et al., tunnel barriers, Physical Review B, vol.75, issue.22, p.224421, 2007.
DOI : 10.1103/PhysRevB.75.224421

S. Matzen, J. Moussy, R. Mattana, F. Petro, C. Gatel et al., (001) ultrathin films, Applied Physics Letters, vol.99, issue.5, p.52514, 2011.
DOI : 10.1063/1.3622307

S. Matzen, J. Moussy, R. Mattana, K. Bouzehouane, C. Deranlot et al., (111) ultrathin layers for room-temperature spin filtering, Physical Review B, vol.83, issue.18, p.184402, 2011.
DOI : 10.1103/PhysRevB.83.184402

URL : https://hal.archives-ouvertes.fr/hal-01240948

T. Aghavnian, J. Moussy, D. Stanescu, R. Belkhou, N. Jedrecy et al., Determination of the cation site distribution of the spinel in multiferroic CoFe2O4/BaTiO3 layers by X-ray photoelectron spectroscopy, Journal of Electron Spectroscopy and Related Phenomena, vol.202, p.16, 2015.
DOI : 10.1016/j.elspec.2015.02.006

URL : https://hal.archives-ouvertes.fr/cea-01365822

P. Ohresser, E. Otero, F. Choueikani, K. Chen, S. Stanescu et al., DEIMOS: A beamline dedicated to dichroism measurements in the 350???2500 eV energy range, Review of Scientific Instruments, vol.85, issue.1, p.13106, 2014.
DOI : 10.1063/1.4861191

URL : https://hal.archives-ouvertes.fr/hal-01088125

C. Carvallo, P. Sainctavit, M. Arrio, N. Menguy, Y. Wang et al., Biogenic vs. abiogenic magnetite nanoparticles: A XMCD study, American Mineralogist, vol.93, issue.5-6, p.880, 2008.
DOI : 10.2138/am.2008.2713

URL : https://hal.archives-ouvertes.fr/hal-00643518

J. H. Scoeld, Hartree-Slater subshell photoionization cross-sections at 1254 and 1487 eV, Journal of Electron Spectroscopy and Related Phenomena, vol.8, issue.2, p.129, 1976.
DOI : 10.1016/0368-2048(76)80015-1

T. Fujii, F. De-groot, G. Sawatzky, F. Voogt, T. Hibma et al., -assisted molecular-beam epitaxy, Physical Review B, vol.59, issue.4, p.3195, 1999.
DOI : 10.1103/PhysRevB.59.3195

URL : https://hal.archives-ouvertes.fr/in2p3-00656167

T. Suzuki, Y. Nishi, and M. Fujimoto, thin films, Philosophical Magazine A, vol.84, issue.10, p.2461, 1999.
DOI : 10.1143/JJAP.36.276

URL : https://hal.archives-ouvertes.fr/hal-00482784

H. S. Nalwa, Handbook of Thin Films, Five-Volume Set, 2001.

G. Arlt and P. Sasko, ceramics, Journal of Applied Physics, vol.51, issue.9, p.4956, 1980.
DOI : 10.1063/1.328372

T. Hoshina, K. Takizawa, J. Li, T. Kasama, H. Kakemoto et al., Domain Size Effect on Dielectric Properties of Barium Titanate Ceramics, Japanese Journal of Applied Physics, vol.47, issue.9, p.7607, 2008.
DOI : 10.1143/JJAP.47.7607

C. Chinnasamy, B. Jeyadevan, K. Shinoda, K. Tohji, D. Djayaprawira et al., Unusually high coercivity and critical single-domain size of nearly monodispersed CoFe2O4 nanoparticles, Applied Physics Letters, vol.83, issue.14, p.2862, 2003.
DOI : 10.1063/1.1616655

D. Margulies, F. Parker, M. Rudee, F. Spada, J. Chapman et al., Films, Physical Review Letters, vol.79, issue.25, p.5162, 1997.
DOI : 10.1103/PhysRevLett.79.5162

J. Moussy, S. Gota, A. Bataille, M. Guittet, M. Gautier-soyer et al., Thickness dependence of anomalous magnetic behavior in epitaxial Fe3O4(111) thin films: Effect of density of antiphase boundaries, Physical Review B, vol.70, issue.17, p.174448, 2004.
DOI : 10.1103/PhysRevB.70.174448

A. Bataille, Etude des propriétés physiques des lms de Fe3O4 épitaxiés et de la polarisation en spin à l'interface Fe3O4/?-Al2O3, 2005.

M. Rioult, Hematite-based epitaxial thin lms as photoanodes for solar water splitting, 2015.

A. Gruverman, A. Kholkin, A. Kingon, and H. Tokumoto, Asymmetric nanoscale switching in ferroelectric thin films by scanning force microscopy, Applied Physics Letters, vol.78, issue.18, p.2751, 2001.
DOI : 10.1063/1.1366644

K. Park, S. Xu, Y. Liu, G. Hwang, S. L. Kang et al., Thin Film Nanogenerator on Plastic Substrates, Nano Letters, vol.10, issue.12, p.4939, 2010.
DOI : 10.1021/nl102959k

Y. Qi, S. M. Anlage, H. Zheng, and R. Ramesh, Local dielectric measurements of BaTiO3???CoFe2O4 nanocomposites through microwave microscopy, Journal of Materials Research, vol.5, issue.05, p.1193, 2007.
DOI : 10.1063/1.125270

R. Bozorth, E. F. Tilden, and A. J. Williams, Anisotropy and Magnetostriction of Some Ferrites, Physical Review, vol.99, issue.6, p.1788, 1955.
DOI : 10.1103/PhysRev.99.1788

L. Joly, B. Muller, E. Sternitzky, J. Faullumel, A. Boulard et al., electrical transport measurements, Journal of Synchrotron Radiation, vol.10, issue.3, p.652, 2016.
DOI : 10.1107/S1600577516002551

C. L. Muhich, V. J. Aston, R. M. Trottier, A. W. Weimer, and C. B. Musgrave, First-Principles Analysis of Cation Diffusion in Mixed Metal Ferrite Spinels, Chemistry of Materials, vol.28, issue.1, p.214, 2015.
DOI : 10.1021/acs.chemmater.5b03911

R. Waser, R. Dittmann, G. Staikov, and K. Szot, Redox-Based Resistive Switching Memories - Nanoionic Mechanisms, Prospects, and Challenges, Advanced Materials, vol.18, issue.25-26, p.2632, 2009.
DOI : 10.1002/adma.200900375