Dr. Karim Bouzehouane Profile

Dr. Karim Bouzehouane

at Unité Mixte de Physique CNRS/Thales

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Publications (4)

Proceedings Article | 1 August 2021 Presentation

Quantitative imaging of antiferromagnetic spin cycloidal textures on strain engineered BiFeO3 thin films with a scanning nitrogen-vacancy magnetometer

Hai Zhong, Johanna Fischer, Angela Haykal, Aurore Finco, Alexander Stark, Felipe Favaro de Oliveira, Patrick Maletinsky, Mathieu Munsch, Karim Bouzehouane, Stéphane Fusil, Vincent Jacques, Vincent Garcia

Proceedings Volume 11805, 118050U (2021) https://doi.org/10.1117/12.2600960

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Antiferromagnetic thin films attract significant interest for future low-power spintronic devices [1]. Multiferroics, such as bismuth ferrite BiFeO3, in which antiferromagnetism and ferroelectricity coexist at room temperature, appears as a unique platform for spintronic [2] and magnonic devices [3]. The nanoscale structure of its ferroelectric domains has been widely investigated with piezoresponse force microscopy (PFM), revealing unique domain structures and domain wall functionalities [4]. However, the nanoscale magnetic textures present in BiFeO3 and their potential for spin-based technology remain concealed. In this report, we present two different antiferromagnetic spin textures in multiferroic BiFeO3 thin films with different epitaxial strains, using a commercial non-invasive scanning Nitrogen-Vacancy (NV) magnetometer based on a single NV defect in diamond, with a calibrated NV flying height of 60 nm and a proven DC field sensitivity of 1 T/Hz. Two BiFeO3 samples were grown on DyScO3 (110) and SmScO3 (110) substrates (later mentioned as BFO/DSO and BFO/SSO, respectively) using pulsed laser deposition. The striped ferroelectric domains in both samples are first observed by the in-plane PFM. The scanning NV magnetometry (SNVM) confirms the existence of the spin cycloid texture, with zig-zag wiggling angles of 90 and 127, and propagation wavelength of DSO=64 nm andSSO=103 nm, respectively. At the local scale, the combination of PFM and SNVM allows to identify the relative orientation of the ferroelectric polarization and cycloid propagation directions on both sides of a domain wall. For the BFO/DSO sample, the 90-degree in-plane rotation of the ferroelectric polarization imprints the 90-degree in-plane rotation of the cycloidal propagation direction along k1=[-1 1 0], corresponding to the type-I cycloid. On the contrary, in the BFO/SSO sample, the propagation vectors are found to be along k1'=[-2 1 1] and k2'= [1 -2 1] directions in the neighboring domains separated by the 71 domain wall. It is worth to mentioned that in the previous report [5], BFO/SSO, prepared in another growth chamber, showed G-type antiferromagnetic textures, compared to the observed type-II cycloid here. Our results here shed the light on future potential for reconfigurable nanoscale spin textures on multiferroic systems by strain engineering.

Proceedings Article | 1 August 2021 Presentation

Tuneable stochastic domain-wall trajectories in a nanoscale magnetic Galton board

Dedalo Sanz-Hernandez, Maryam Massouras, Nicolas Reyren, Nicolas Rougemaille, Vojtěch Schánilec, Karim Bouzehouane, Michel Hehn, Benjamin Canals, Damien Querlioz, Julie Grollier, François Montaigne, Daniel Lacour

Proceedings Volume 11805, 118051H (2021) https://doi.org/10.1117/12.2596038

KEYWORDS: Magnetism, Stochastic processes, Microscopy, Image processing, Nanowires, Switching, Statistical analysis, Nanostructures, Magneto-optics, Magnetic tracking

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Proceedings Article | 18 September 2018 Presentation

Controlling the hybrid chiralities of skyrmions in magnetic multilayers (Conference Presentation)

William Legrand, Jean-Yves Chauleau, Davide Maccariello, Nicolas Reyren, Sophie Collin, Karim Bouzehouane, Nicolas Jaouen, Vincent Cros, Albert Fert

Proceedings Volume 10732, 1073234 (2018) https://doi.org/10.1117/12.2320987

KEYWORDS: Magnetism, Ferromagnetics, Interfaces, Dichroic materials, X-ray technology, X-rays, Scattering, Anisotropy

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Proceedings Article | 6 September 2017 Presentation + Paper

Skyrmions in magnetic multilayers: chirality, electrical detection and current-induced motion

Nicolas Reyren, Karim Bouzehouane, Jean-Yves Chauleau, Sophie Collin, Albert Fert, Simone Finizio, Karin Garcia, Sean Hughes, Nicolas Jaouen, William Legrand, Davide Maccariello, Samuel McFadzean, Stephen McVitie, Christoforos Moutafis, Horia Popescu, Jörg Raabe, C. A. Vaz, Vincent Cros

Proceedings Volume 10357, 1035724 (2017) https://doi.org/10.1117/12.2275058

KEYWORDS: Magnetism, Multiphoton fluorescence microscopy, Crystals, Holography, X-ray microscopy, Spatial resolution, Microscopy, Motion controllers, Atomic force microscopy, Anisotropy

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