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.
Papers
More filters
Journal ArticleDOI
Exchange bias effect in polycrystalline NiO/NiMn2O4 composite
A.J. Freitas Cabral,J.D. Peña Serna,B. Rache Salles,Miguel A. Novak,A.L. Pinto,C.M. Rocha Remédios +5 more
TL;DR: In this article, aqueous solution formed by different molar ratios between the nickel and manganese chlorides led to the formation of antiferromagnetic NiO/ferrimagnetic NiMn2O4 oxide composites, as determined by X-ray powder diffraction technique and Rietveld refinement.
Journal ArticleDOI
Quantum tunnelling in magnetic particles, layers and multilayers
Bernard Barbara,J. E. Wegrowe,Luiz C. Sampaio,J P Nozières,M. Uehara,Miguel A. Novak,Carley Paulsen,J.L. Tholence +7 more
TL;DR: In this paper, an analogy with Josephson junction was made for the case of the sandwiches (domain wall junction) and the role of dissipation was discussed, in terms of a crossover between a thermal regime, in which the irreversible rotation of the magnetization is thermally activated, and a quantum regime in which it proceeds by quantum tunnelling.
Journal ArticleDOI
Synthesis, molecular structure and spectroscopic, electrochemical and magnetic properties of a new dinuclear iron complex containing µ-sulfate-di-µ-alkoxo bridges: evaluating the influence of the sulfate bridge on the physicochemical properties of the di-µ-alkoxo-diiron unit
TL;DR: Complex [Fe2III(BPClNOL)2(SO4)] 3 was synthesized through the reaction of the pro-ligand N-(2-hydroxybenzyl)-N-(2pyridylmethyl)[(3-chloro)(2hydroxy)]propylamine (H2BPCl NOL) and FeSO4.
Journal ArticleDOI
Role of the alloy structure in the magnetic behavior of granular systems
C. S. M. Bastos,M. Bahiana,Wallace C. Nunes,Miguel A. Novak,Dora Altbir,Patricio Vargas,Marcelo Knobel +6 more
TL;DR: In this paper, the effect of grain size, easy magnetization axis, and anisotropy constant distributions in the irreversible magnetic behavior of granular alloys is considered, and a simulated granular alloy is used to provide a realistic grain structure for the Monte Carlo simulation of the zero-field-cooled-fieldcooled (ZFC-FC) curves.
Journal ArticleDOI
Pressure effects of a genuine organic crystalline ferromagnet dupeyredioxyl
TL;DR: In this article, the isothermal magnetization M of the genuine organic crystalline dupeyredioxyl (N, N, N ′-dioxy-1,3,5,7-tetramethyl-2,6-diazaadamantane; T c (0)=1.48 K) observed below 10 K converges on the S = 1 Brillouin function B 1 ((H + λM )/k B T ) with λ = 2.3 K, where J and z are, respectively