L
Luiz C. Sampaio
Researcher at National Council for Scientific and Technological Development
Publications - 56
Citations - 1713
Luiz C. Sampaio is an academic researcher from National Council for Scientific and Technological Development. The author has contributed to research in topics: Magnetization & Magnetic domain. The author has an hindex of 18, co-authored 54 publications receiving 1609 citations. Previous affiliations of Luiz C. Sampaio include Centre national de la recherche scientifique & University of Paris-Sud.
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Preparation and characterization of (3-aminopropyl) triethoxysilane-coated magnetite nanoparticles
TL;DR: Magnetite nanoparticles coated with (3-aminopropyl)triethoxysilane, NH2(CH2)3Si(OC2H5)3 were prepared by silanization reaction and characterized by X-ray diffractometry, transmission electron microscopy, atomic force microscopy and Fourier transform infrared spectroscopy and magnetization measurements as mentioned in this paper.
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Magnetic microwires as macrospins in a long-range dipole-dipole interaction
Luiz C. Sampaio,E. H. C. P. Sinnecker,G. Cernicchiaro,Marcelo Knobel,Manuel Vázquez,J. Velázquez +5 more
TL;DR: In this paper, the long-range dipole-dipole interaction in an array of ferromagnetic microwires is studied through magnetic hysteresis measurements and Monte Carlo simulation.
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Mesoscopic quantum tunneling of the magnetization
Bernard Barbara,Wolfgang Wernsdorfer,Luiz C. Sampaio,J.-G. Park,C. Paulsen,Miguel A. Novak,R. Ferré,Dominique Mailly,Roberta Sessoli,Andrea Caneschi,Klaus Hasselbach,Alain Benoit,Luc Thomas +12 more
TL;DR: In this article, the first low-temperature/time-dependent magnetization experiments, performed on single sub-micronic particles and on arrays nanoparticles in molecular crystals, are described.
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Magnetic susceptibility effects on 13C MAS NMR spectra of carbon materials and graphite.
Jair C. C. Freitas,Francisco G. Emmerich,G. Cernicchiaro,Luiz C. Sampaio,Tito José Bonagamba +4 more
TL;DR: It is shown that these results are better understood when a comparison is made with the features of the 13C NMR spectrum of polycrystalline graphite, for which the magnetic susceptibility effect is also present and is much more pronounced.
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Quantum tunneling in magnetic systems of various sizes (invited)
Bernard Barbara,Luiz C. Sampaio,J. E. Wegrowe,B. A. Ratnam,A. Marchand,C. Paulsen,Miguel A. Novak,J.L. Tholence,M. Uehara,D. Fruchart +9 more
TL;DR: In this article, the results of magnetic relaxation experiments are shown to agree with theoretical predictions of quantum tunneling of the magnetization, and the authors emphasize the study of low temperature relaxation in ferromagnetic nanoparticles, layers, and multilayers (including domain wall junctions).