J
Julien Renard
Researcher at University of Grenoble
Publications - 72
Citations - 2651
Julien Renard is an academic researcher from University of Grenoble. The author has contributed to research in topics: Quantum dot & Exciton. The author has an hindex of 28, co-authored 70 publications receiving 2445 citations. Previous affiliations of Julien Renard include Joseph Fourier University & University of British Columbia.
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Journal ArticleDOI
Magnetization process of an S=1 linear-chain Heisenberg antiferromagnet
TL;DR: Observations mettent en evidence the presence d'une bande interdite de Haldane dans l'echantillon.
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Hysteresis properties of ultrathin ferromagnetic films
Patrick Bruno,Günther Bayreuther,Pierre Beauvillain,Claude Chappert,G. Lugert,D. Renard,Julien Renard,J. Seiden +7 more
Abstract: We have investigated the hysteresis properties of Au/Co/Au films with ultralow Co thicknesses and perpendicular easy axis. At low temperature we observe a very strong thickness dependence of the coercivity, whereas striking dynamical effects are present at room temperature. We propose a model of wall motion which provides a consistent explanation of the overall observations. This interpretation emphasizes the crucial role played by the roughness with respect to the hysteresis properties of ferromagnetic ultrathin films.We have investigated the hysteresis properties of Au/Co/Au films with ultralow Co thicknesses and perpendicular easy axis. At low temperature we observe a very strong thickness dependence of the coercivity, whereas striking dynamical effects are present at room temperature. We propose a model of wall motion which provides a consistent explanation of the overall observations. This interpretation emphasizes the crucial role played by the roughness with respect to the hysteresis properties of ferromagnetic ultrathin films.
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Growth of GaN free-standing nanowires by plasma-assisted molecular beam epitaxy:structural and optical characterization
Maria Tchernycheva,Maria Tchernycheva,Corinne Sartel,G. E. Cirlin,Laurent Travers,Gilles Patriarche,Jean-Christophe Harmand,Le Si Dang,Julien Renard,Bruno Gayral,Laurent Nevou,F. H. Julien +11 more
TL;DR: In this paper, the growth, structural and optical properties of GaN free-stranding nanowires synthesized in catalyst-free mode on Si(111) substrate by plasma-assisted molecular beam epitaxy were observed.
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Susceptibility and magnetization of CuMn ( S 2 C 2 O 2 ) 2 ·7.5 H 2 O. First experimental and theoretical characterization of a quasi-one-dimensional ferrimagnetic chain
TL;DR: In this paper, the quasi-one-dimensional compound CuMn was synthesized and its magnetic susceptibility was measured in the temperature range $T=4.2\ensuremath{-}240$ K.
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Evidence for quantum-confined Stark effect in GaN/AlN quantum dots in nanowires
TL;DR: In this paper, it was shown that polar GaN/AlN axial heterostructures in nanowires grown by plasma-assisted molecular-beam epitaxy are subject to a clear quantum-confined Stark effect.