Navegação Ciências Exatas e da Terra por Autor "Nicolodi, Sabrina"
Resultados 1-11 de 11
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Controlled rotation of the exchange-bias direction in IrMn/Cu/Co via ion irradiation
Schäfer, Deise; Geshev, Julian Penkov; Nicolodi, Sabrina; Pereira, Luis Gustavo; Schmidt, Joao Edgar; Grande, Pedro Luis (2008) [Artigo de periódico]Co/Cu/IrMn films were irradiated with 40 keV He+ ions varying the fluence and the current, with magnetic field applied at 120° with respect to the original exchange-bias direction. The angular variations of the exchange-bias ... -
Discrimination between coupling and anisotropy fields in exchange-biased bilayers
Geshev, Julian Penkov; Nicolodi, Sabrina; Silva, Ricardo Barreto da; Nogués Sanmiquel, Josep; Skumryev, Vassil; Baró, Maria Dolors (2009) [Artigo de periódico]In the framework of models that assume planar domain wall formed at the antiferromagnetic part of the interface of exchange-biased bilayers, one cannot distinguish between the cases of high or low ratios between the coupling ... -
Exchange bias through a Cu interlayer in an IrMn/Co system
Geshev, Julian Penkov; Nicolodi, Sabrina; Pereira, Luis Gustavo; Nagamine, Luiz Carlos Camargo Miranda; Schmidt, Joao Edgar; Deranlot, Cyrile; Petroff, Frédéric; Rodríguez-Suárez, Roberto Lazaro; Costa, Antonio Azevedo da (2007) [Artigo de periódico]Ferromagnetic resonance FMR and magnetization MAG measurements were used to study the exchange interaction between the antiferromagnetic and ferromagnetic layers in an IrMn/Cu/Co system as a function of the Cu spacer ... -
Impact of magnetization easy-axis distributions on the ferromagnet-antiferromagnet exchange-coupling estimation
Geshev, Julian Penkov; Nicolodi, Sabrina; Pereira, Luis Gustavo; Schmidt, Joao Edgar; Skumryev, Vassil; Suriñach, Santi; Baró, Maria Dolors (2008) [Artigo de periódico]It is frequently reported that different measurement techniques may yield distinct values for the exchange anisotropy, being the difference of up to one order of magnitude on comparing magnetization loop with ac susceptibility ... -
Magnesium surface enrichment of CoFe2O4 magnetic nanoparticles immobilized with gold : reusable catalysts for green oxidation of benzyl alcohol
Abreu, Wiury Chaves de; Garcia, Marco Aurélio Suller; Nicolodi, Sabrina; Moura, Carla Verônica Rodarte de; Moura, Edmilson Miranda de (2018) [Artigo de periódico]Gold nanoparticles have shown excellent activity for selective oxidation of alcohols; such catalytic systems are highly dependent on the initial activation of the substrates, which must occur on the catalyst surface in ... -
Magnetic materials enriched with strontium : a study of the use as catalysts in the transesterification reaction of babassu oil
Abreu, Wiury Chaves de; Moraes, Ana Flávia; Reis, Roberta Yonara Nascimento; Pinto, Bernardo Ferreira; Moura, Carla Verônica Rodarte de; Nicolodi, Sabrina; Moura, Edmilson Miranda de (2019) [Artigo de periódico]This work described a new magnetic material enriched with strontium as catalyst to produce babassu biodiesel. The use of magnetic materials has attracted attention due to easy and fast separation from reaction medium. ... -
Negative rotatable anisotropy in IrMn/Cr/Co thin films
Nicolodi, Sabrina; Pereira, Luis Gustavo; Oliveira, Artur Harres de; Azevedo, Gustavo de Medeiros; Schmidt, Joao Edgar; García Aguilar, I.; Souza Neto, N. M.; Deranlot, Cyrile; Petroff, Frédéric; Geshev, Julian Penkov (2012) [Artigo de periódico]This work presents modifications of the magnetic properties of polycrystalline IrMn/Cr(tCr)/Co films where the Cr spacer thickness tCr was varied between 0.25 and 3 nm. High-resolution transmission electron microscopy, ... -
Quantifying magnetic anisotropy dispersion : theoretical and experimental study of the magnetic properties of anisotropic FeCuNbSiB ferromagnetic films
Alves, Tibério Magno de Lima; Bezerra, Claudionor Gomes; Viegas, Alexandre da Cas; Nicolodi, Sabrina; Corrêa, Marcio Assolin; Bohn, Felipe (2015) [Artigo de periódico]We performed a theoretical and experimental investigation of the quasi-static magnetic properties of anisotropic systems. We considered a modified Stoner-Wohlfarth model to describe anisotropic systems, and a distribution ... -
Synthesis, characterization and catalytic evaluation of magnetically recoverable SrO/CoFe2O4 nanocatalyst for biodiesel production from babassu oil transesterification
Falcão, Milton de Sousa; Garcia, Marco Aurélio Suller; Moura, Carla Verônica Rodarte de; Nicolodi, Sabrina; Moura, Edmilson Miranda de (2018) [Artigo de periódico]Biodiesel production has gained a lot of attention due to its environmental benefits and production from renewable sources. Here, it is reported a magnetically recoverable catalyst of SrO immobilized on a CoFe2O4 support ... -
Synthesis of magnetic nanoparticles functionalized with histidine and nickel to immobilize His-tagged enzymes using β-galactosidase as a model
Andrade, Bruna Coelho de; Gennari, Adriano; Renard, Gaby; Da Rolt Nervis, Brenda; Benvenutti, Edilson Valmir; Costa, Tania Maria Haas; Nicolodi, Sabrina; Silveira, Nádya Pesce da; Chies, Jocelei Maria; Volpato, Giandra; Souza, Claucia Fernanda Volken de (2021) [Artigo de periódico]The aim of this study was to synthesize iron magnetic nanoparticles functionalized with histidine and nickel (Fe3O4-His-Ni) to be used as support materials for oriented immobilization of His-tagged recombinant enzymes of ... -
Unveiling the mechanisms governing the exchange coupling and coercivity modifications in annealed or ion-irradiated Ir-Mn/Fe/Co and Ir-Mn/Ni-Fe/Co films
Salazar, Josiane Bueno; Pereira, Luis Gustavo; Grande, Pedro Luis; Schmidt, Joao Edgar; Schneider, Juliano Augusto; Nicolodi, Sabrina; Skumryev, Vassil; Oliveira, Artur Harres de; Steadman, Paul; Benčok, Peter; Dobrynin, Alexey N.; Geshev, Julian Penkov (2018) [Artigo de periódico]We investigate the modifications of the exchange bias, effective ferromagnet-antiferromagnet (FMAFM) coupling, and coercivity in annealed or ion-irradiated Ir-Mn/spacer layer (SL)/Co trilayers. A ferromagnetic, either Fe ...