Nicolas BERGEARD

Chargé de Recherche, Surfaces et Interfaces (DSI)Nicolas.Bergeard@ipcms.unistra.fr

Tél: +33(0)3 88 10 71 04Bureau: 1036

Parcours de recherche

Since 2015: Permanent position at CNRS (Chargé de Recherche)

2014 – 2015: Post-doctorat at the « Département Physique de la Matière et des Matériaux (P2M) » Institut Jean Lamour (IJL) and Université de Lorraine (Nancy).

2013 – 2014: Post-doctorat at the « Département Surfaces et Interfaces (DSI) » Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS).

2011 – 2013: Post-doctorat at the « Ultrafast phenomena in solids and at interfaces » AG Bovensiepen Duisburg-Essen Universität (Germany).

2007 – 2010: PhD Student at the group « Imagerie et Dynamique en magnétisme (IDMAG) » Laboratoire de Physique des Solides (LPS) (supervisor A. Mougin) and at the TEMPO beamline, Synchrotron Soleil (supervisor F. Sirotti).

Parcours universitaire

Renseignez ici votre parcours universitaire.

Recherches actuelles

Ultrafast magnetization dynamics in ferrimagnetic alloys.

Electronic, magnetic and structural properties of ferrimagnetic alloys.

Publications

[1]

M.G. Silly, T. Ferté, M.A. Tordeux, D. Pierucci, N. Beaulieu, C. Chauvet, F. Pressacco, F. Sirotti, H. Popescu, V. Lopez-Flores, M. Tortarolo, M. Sacchi, N. Jaouen, P. Hollander, J.P. Ricaud, N. Bergeard, C. Boeglin, B. Tudu, R. Delaunay, J. Luning, G. Malinowski, M. Hehn, C. Baumier, F. Fortuna, D. Krizmancic, L. Stebel, R. Sergo, G. Cautero, Pump-probe experiments at the TEMPO beamline using the low-alpha operation mode of Synchrotron SOLEIL, Journal of Synchrotron Radiation 24 (2017) 886–897. https://doi.org/10.1107/S1600577517007913.

[1]

B. Seng, D. Schoenke, J. Yeste, R.M. Reeve, N. Kerber, D. Lacour, J.-L. Bello, N. Bergeard, F. Kammerbauer, M. Bhukta, T. Ferté, C. Boeglin, F. Radu, R. Abrudan, T. Kachel, S. Mangin, M. Hehn, M. Klaeui, Direct Imaging of Chiral Domain Walls and Neel-Type Skyrmionium in Ferrimagnetic Alloys, Advanced Functional Materials (2021) 2102307. https://doi.org/10.1002/adfm.202102307.

[1]

M. Pace, D. Gupta, T. Ferté, M. Riepp, G. Malinowski, M. Hehn, F. Pressacco, M. Silly, F. Sirotti, C. Boeglin, N. Bergeard, Laser induced ultrafast Gd 4f spin dynamics at the surface of amorphous CoxGd100-x ferrimagnetic alloys, Journal of Electron Spectroscopy and Related Phenomena 275 (2024) 147461. https://doi.org/10.1016/j.elspec.2024.147461.

[1]

G. Malinowski, N. Bergeard, M. Hehn, S. Mangin, Hot-electron transport and ultrafast magnetization dynamics in magnetic multilayers and nanostructures following femtosecond laser pulse excitation, European Physical Journal B 91 (2018) 98. https://doi.org/10.1140/epjb/e2018-80555-5.

[1]

V. Lopez-Flores, N. Bergeard, V. Halté, C. Stamm, N. Pontius, M. Hehn, E. Otero, E. Beaurepaire, C. Boeglin, Role of critical spin fluctuations in ultrafast demagnetization of transition-metal rare-earth alloys, Physical Review B 87 (2013) 214412. https://doi.org/10.1103/PhysRevB.87.214412.

[1]

E. Jal, V. López-Flores, N. Pontius, T. Ferté, N. Bergeard, C. Boeglin, B. Vodungbo, J. Lüning, N. Jaouen, Structural dynamics during laser-induced ultrafast demagnetization, Physical Review B 95 (2017) 184422. https://doi.org/10.1103/PhysRevB.95.184422.

[1]

T. Ferté, M. Beens, G. Malinowski, K. Holldack, R. Abrudan, F. Radu, T. Kachel, M. Hehn, C. Boeglin, B. Koopmans, N. Bergeard, Laser induced ultrafast Gd 4f spin dynamics in Co100-xGdx alloys by means of time-resolved XMCD, The European Physical Journal Special Topics early access (2023). https://doi.org/10.1140/epjs/s11734-023-00812-w.

[1]

T. Ferté, G. Malinowski, E. Terrier, V. Halté, L.L. Guyader, K. Holldack, M. Hehn, C. Boeglin, N. Bergeard, Laser induced ultrafast 3d and 4f spin dynamics in CoDy ferrimagnetic alloys as a function of temperature, Journal of Magnetism and Magnetic Materials 530 (2021) 167883. https://doi.org/10.1016/j.jmmm.2021.167883.

[1]

T. Ferté, N. Bergeard, L. Le Guyader, M. Hehn, G. Malinowski, E. Terrier, E. Otero, K. Holldack, N. Pontius, C. Boeglin, Element-resolved ultrafast demagnetization rates in ferrimagnetic CoDy, Physical Review B 96 (2017) 134303. https://doi.org/10.1103/PhysRevB.96.134303.

[1]

T. Ferté, N. Bergeard, G. Malinowski, E. Terrier, L.L. Guyader, K. Holldack, M. Hehn, C. Boeglin, Ultrafast demagnetization in buried Co80Dy20 as fingerprint of hot-electron transport, Journal of Magnetism and Magnetic Materials 485 (2019) 320–324. https://doi.org/10.1016/j.jmmm.2019.04.068.

[1]

T. Ferté, N. Bergeard, G. Malinowski, R. Abrudan, T. Kachel, K. Holldack, M. Hehn, C. Boeglin, Ultrafast hot-electron induced quenching of Tb $4f$ magnetic order, Physical Review B 96 (2017) 144427. https://doi.org/10.1103/PhysRevB.96.144427.

[1]

N. Bergeard, A. Mougin, M. Izquierdo, E. Fonda, F. Sirotti, Correlation between structure, electronic properties, and magnetism in $\mathrmCo_x\mathrmGd_1\ensuremath-x$ thin amorphous films, Physical Review B 96 (2017) 064418. https://doi.org/10.1103/PhysRevB.96.064418.

[1]

N. Bergeard, M. Hehn, K. Carva, P. Balaz, S. Mangin, G. Malinowski, Tailoring femtosecond hot-electron pulses for ultrafast spin manipulation, Applied Physics Letters 117 (2020) 222408. https://doi.org/10.1063/5.0018502.

[1]

N. Bergeard, V. Lopez-Flores, V. Halté, M. Hehn, C. Stamm, N. Pontius, E. Beaurepaire, C. Boeglin, Element- and time-resolved dynamics in rare-earth/transition metals alloys, in: Bigot, JY and Hubner, W and Rasing, T and Chantrell, R (Ed.), Ultrafast Magnetism I, SPRINGER INT PUBLISHING AG, Strasbourg, France, 2015: pp. 310–312. https://doi.org/10.1007/978-3-319-07743-7_96.

[1]

N. Bergeard, V. Lopez-Flores, V. Halté, M. Hehn, C. Stamm, N. Pontius, E. Beaurepaire, C. Boeglin, Ultrafast angular momentum transfer in multisublattice ferrimagnets, Nature Communications 5 (2014) 3466. https://doi.org/10.1038/ncomms4466.

[1]

N. Bergeard, S. Schaffert, V. Lopez-Flores, N. Jaouen, J. Geilhufe, C.M. Guenther, M. Schneider, C. Graves, T. Wang, B. Wu, A. Scherz, C. Baumier, R. Delaunay, F. Fortuna, M. Tortarolo, B. Tudu, O. Krupin, M.P. Minitti, J. Robinson, W.F. Schlotter, J.J. Turner, J. Luening, S. Eisebitt, C. Boeglin, Irreversible transformation of ferromagnetic ordered stripe domains in single-shot infrared-pump/resonant-x-ray-scattering-probe experiments, Physical Review B 91 (2015) 054416. https://doi.org/10.1103/PhysRevB.91.054416.

[1]

W. Baaziz, B.P. Pichon, Y. Liu, J.-M. Greneche, C. Ulhaq-Bouillet, E. Terrier, N. Bergeard, V. Halté, C. Boeglin, F. Choueikani, M. Toumi, T. Mhiri, S. Bégin-Colin, Tuning of Synthesis Conditions by Thermal Decomposition toward Core-Shell CoxFe1-xO@CoyFe3-yO4 and CoFe2O4 Nanoparticles with Spherical and Cubic Shapes, Chemistry of Materials 26 (2014) 5063–5073. https://doi.org/10.1021/cm502269s.