M
Miguel A. Novak
Researcher at Federal University of Rio de Janeiro
Publications - 119
Citations - 8511
Miguel A. Novak is an academic researcher from Federal University of Rio de Janeiro. The author has contributed to research in topics: Magnetization & Magnetic susceptibility. The author has an hindex of 34, co-authored 118 publications receiving 8148 citations. Previous affiliations of Miguel A. Novak include Centre national de la recherche scientifique.
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Journal ArticleDOI
Aging investigation of cobalt ferrite nanoparticles in low pH magnetic fluid
Maria A. G. Soler,Emília Celma de Oliveira Lima,Sebastião William da Silva,Tiago F. O. Melo,A.C.M. Pimenta,J.P. Sinnecker,Ricardo Bentes Azevedo,Vijayendra K. Garg,Aderbal C. Oliveira,Miguel A. Novak,Paulo C. Morais +10 more
TL;DR: The authors' data showed that the employed nanoparticle surface passivation process, besides the formation of an iron-rich surface layer, modifies the nanoparticle core as well, improving the crystal quality while modifying the Fe/Co cation distribution and the nanoparticles dissolution rate profile.
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Glauber slow dynamics of the magnetization in a molecular Ising chain
Andrea Caneschi,Dante Gatteschi,Nikolia Lalioti,Claudio Sangregorio,Roberta Sessoli,G. Venturi,Alessandro Vindigni,Angelo Rettori,Maria Gloria Pini,Miguel A. Novak +9 more
TL;DR: In this article, the slow dynamics of the magnetization in the paramagnetic phase, predicted by Glauber for 1d Ising ferromagnets, has been observed with ac susceptibility and SQUID magnetometry measurements in a molecular chain comprising alternating Co{2+} spins and organic radical spins strongly antiferromagneticically coupled.
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Finite-size effects on the static properties of a single-chain magnet
Lapo Bogani,Roberta Sessoli,Maria Gloria Pini,Angelo Rettori,Miguel A. Novak,Patrick Rosa,Mirko Massi,Mariaelena Fedi,Lorenzo Giuntini,Andrea Caneschi,Dante Gatteschi +10 more
TL;DR: In this article, the role of defects in the single-chain magnet CoPhOMe by inserting a controlled number of diamagnetic impurities was investigated with the particle induced x-ray emission technique.
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New Families of Hetero-tri-spin 2p−3d−4f Complexes: Synthesis, Crystal Structures, and Magnetic Properties
Lívia B. L. Escobar,Guilherme P. Guedes,Stéphane Soriano,Nivaldo L. Speziali,Alessandro K. Jordão,Anna C. Cunha,Vitor F. Ferreira,Catalin Maxim,Miguel A. Novak,Marius Andruh,Maria G. F. Vaz +10 more
TL;DR: The synthesis, crystal structures, and magnetic behavior of 2p-3d-4f heterospin systems containing the nitroxide radical 4-azido-2,2,6,6-tetramethylpiperidine-1-oxyl radical (N3tempo) are reported.
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Magnetic properties of a Mn cluster organic compound
TL;DR: In this paper, the authors describe unusual magnetic properties of a 12 Mn cluster organic compound that has a S = 10 ground state and a very high anisotropy, with relaxation times following τ = τ 0 exp( Δ / T ), where τ 0 ∼ 10 −7 s.