{"id":85,"date":"2013-12-06T12:23:58","date_gmt":"2013-12-06T12:23:58","guid":{"rendered":"https:\/\/sites.ifi.unicamp.br\/modelo\/?page_id=26"},"modified":"2014-02-03T18:47:11","modified_gmt":"2014-02-03T18:47:11","slug":"pesquisa","status":"publish","type":"page","link":"https:\/\/sites.ifi.unicamp.br\/fberon\/pesquisa\/","title":{"rendered":"Pesquisa"},"content":{"rendered":"

<\/p>\n

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2014 – Atual<\/b><\/div>\n<\/div>\n
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Magnetic antidots<\/div>\n<\/div>\n
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\u00a0<\/b><\/div>\n<\/div>\n
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Descri\u00e7\u00e3o: This project concerns the fabrication and characterization of ferromagnetic antidots arrays (composed by transition metal from the Iron group and their alloys) focusing on the dependence of the magnetic properties on the short and long range order, by controlling the symmetry of the array, the hole diameter, and the periodicity. To achieve such a goal, we will prepare magnetic antidot arrays by using three different routes: template assisted (anodized porous alumina) deposition of magnetic thin film; electron-beam lithography and nano-Focused Ion Beam lithography. Additional to the structural and morphological characterization, that will be done with the help of X-ray diffraction, atomic force microscopy and electronic microscopy techniques (SEM and TEM), a deep analysis on the magnetic properties will be performed using different characterization techniques: magnetometry, magneto-optical Kerr effect, Magnetic Force Microscopy and magneto-resistance. The results of all these measurements will be understood with the help of micromagnetic simulations, which are extremely useful for these systems. We hope that this cooperative work will open a route to tailor the magnetic properties of antidot arrays. Despite of the scientific interesting results, we strongly hope that this cooperation will reinforce the international collaboration among the various groups involved in this proposal..
\nSitua\u00e7\u00e3o: Em andamento; Natureza: Pesquisa.Integrantes: Fanny B\u00e9ron – Integrante \/ Pirota, Kleber R. – Coordenador \/ Diego Muraca – Integrante \/ Juliano Casagrande – Integrante \/ Roman Lopez Ruiz – Integrante \/ Dimitris Niarchos – Integrante \/ Juan Luis Palma – Integrante \/ Alejandro Pereira – Integrante \/ Juan Escrig – Integrante \/ JOSE MIGUEL GARCIA MARTIN – Integrante \/ Andreas Kaidatzis – Integrante.
\nFinanciador(es): (FAPESP) Funda\u00e7\u00e3o de Amparo \u00e0 Pesquisa do Estado de S\u00e3o Paulo – Coopera\u00e7\u00e3o.<\/p>\n<\/div>\n<\/div>\n

<\/a><\/p>\n

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2013 – Atual<\/b><\/div>\n<\/div>\n
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Estudos de novos materiais complexos e avan\u00e7ados<\/div>\n<\/div>\n
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\u00a0<\/b><\/div>\n<\/div>\n
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Descri\u00e7\u00e3o: Neste rojeto estamos propondo continuar e aprimorar ainda mais o estudo das propriedades eletr\u00f4nicas, estruturais, magn\u00e9ticas, de transporte e termodin\u00e2micas sob condi\u00e7\u00f5es extremas de altos campos magn\u00e9ticos (14 T), altas press\u00f5es (30 kbars) e baixas temperaturas (50 mK) em sistemas fortemente correlacionados de materiais met\u00e1licos, supercondutores, semimet\u00e1licos, semicondutores, semicondutores magn\u00e9ticos dilu\u00eddos, \u00f3xidos cer\u00e2micos, multiferr\u00f3icos, grafites, grafenos, etc., envolvendo fundamentalmente as intera\u00e7\u00f5es, el\u00e9tron-el\u00e9tron e entre os el\u00e9trons de condu\u00e7\u00e3o com os elementos de transi\u00e7\u00e3o dos grupos 3d do Ferro e 4f das terras-raras. Para este fim, experimentos de resistividade el\u00e9trica, efeito Hall, magnetiza\u00e7\u00e3o, susceptibilidade magn\u00e9tica dc\/ac, calor espec\u00edfico, magnetoimped\u00e2ncia, torquimetria, resson\u00e2ncias paramagn\u00e9tica eletr\u00f4nica (EPR), nuclear (RMN) e quadrupolar (RQN), espalhamento Raman, difra\u00e7\u00e3o de raios-X (p\u00f3 e magn\u00e9tica), absor\u00e7\u00e3o de raios-X (XANES, EXAFS, XMC D) e absor\u00e7\u00e3o no infravermelho estar\u00e3o sendo realizados e analizados durante a execu\u00e7\u00e3o deste Projeto em amostras na forma poli\/mono cristalinas, filmes finos, fios, part\u00edculas, multicamadas nanoestruturadas e amorfas. Com o intuito de aprofundar o entendimento dos fen\u00f4menos em estudo, pretendemos com este projeto tem\u00e1tico, incorporar ao nosso Grupo as t\u00e9cnicas de RMN\/RQN, EDX, WDS, FT-IR e um forno de l\u00e2mpadas (IR Image Furnace) para a prepara\u00e7\u00e3o de novos \u00f3xidos monocristalinos, necess\u00e1rios para a an\u00e1lise e prepara\u00e7\u00e3o dos novos materiais a serem sintetizados..
\nSitua\u00e7\u00e3o: Em andamento; Natureza: Pesquisa.
\nAlunos envolvidos: Gradua\u00e7\u00e3o: (5) \/ Mestrado acad\u00eamico: (7) \/ Doutorado: (6) .Integrantes: Fanny B\u00e9ron – Integrante \/ Rettori, Carlos – Integrante \/ Pagliuso, P G – Integrante \/ Pirota, K. R. – Integrante \/ Knobel, M. – Coordenador \/ Eduardo Granado – Integrante \/ Gaston Eduardo Barberis – Integrante \/ Iakov Kopelevitch – Integrante \/ Oscar Ferreira de Lima – Integrante \/ Ricardo Urbano – Integrante.
\nFinanciador(es): (FAPESP) Funda\u00e7\u00e3o de Amparo \u00e0 Pesquisa do Estado de S\u00e3o Paulo – Aux\u00edlio financeiro.<\/p>\n<\/div>\n<\/div>\n

<\/a><\/p>\n

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2013 – Atual<\/b><\/div>\n<\/div>\n
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Coupling effects in magnetic systems of reduced dimensionality (COEFmagNANO)<\/div>\n<\/div>\n
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\u00a0<\/b><\/div>\n<\/div>\n
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Descri\u00e7\u00e3o: The main objective of this program is to achieve a comprehensive knowledge of magnetically coupled systems of reduced dimensionality. Current lithography and production techniques allow the fabrication of magnetic elements with well controlled geometry and dimensions from few nanometers to micron sizes. These dimensions are comparable to some magnetic length scales, such as domain size, domain wall width, spin diffusion length, etc., thus new magnetic behaviours are expected as the material size approaches these physical length scales. Constraining effects have extensively been studied in ferromagnetic materials. Spin configurations only possible in such small elements, like single domain, vortex and onion states and head-to-head domain walls have been observed and explained by micromagnetic simulations. However, the spin arrangement of magnetically coupled nanostructures have barely been studied. Many competing parameters affect the final properties, which can strongly depend on temperature, magnetic anisotropies, coupling nature, crystalline structure, exchange interaction, interfacial roughness, geometry, stray field, etc. New properties can emerge from these systems as the dimensions of coupled magnetic elements are reduced, but some intrinsic properties observed in bulk and thin film materials can also disappear at nanometer scales; for example, exchange bias phenomenon is no longer preserved in certain materials as the volume of the element becomes too small. In this project a systematic study of coupling effects will be accomplished in patterned nanostructures with both in-plane and out-of-plane anisotropies. Three kinds of magnetically coupled systems will be investigated: antiferromagnetic \/ ferromagnetic (AF\/FM), hard \/ soft materials and superconducting \/ ferromagnetic (SC\/FM) bilayers. The present project frames into the European FP7th priority programme Nanosciences, Nanotechnologies, Materials and New Production Technologies..
\nSitua\u00e7\u00e3o: Em andamento; Natureza: Pesquisa.Integrantes: Fanny B\u00e9ron – Integrante \/ Pirota, K. R. – Integrante \/ Rafael Morales – Coordenador \/ Javier Villegas – Integrante \/ Josep Nogues – Integrante \/ Xavier Battle – Integrante \/ Carlos Garc\u00eda – Integrante \/ Waldemar Macedo – Integrante \/ Ivan Schuller – Integrante \/ Caroline Ross – Integrante \/ Jos\u00e9 Mec\u00eda L\u00f3pez – Integrante \/ Hernan Pastoriza – Integrante \/ Miguel Kiwi – Integrante.
\nFinanciador(es): Uni\u00e3o Europ\u00e9ia – Aux\u00edlio financeiro.<\/p>\n<\/div>\n<\/div>\n

<\/a><\/p>\n

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2012 – Atual<\/b><\/div>\n<\/div>\n
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Desenvolvimento de Materiais para Tecnologias de Energias Renov\u00e1veis<\/div>\n<\/div>\n
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\u00a0<\/b><\/div>\n<\/div>\n
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Descri\u00e7\u00e3o: Coopera\u00e7\u00e3o bilateral com M\u00e9xico..
\nSitua\u00e7\u00e3o: Em andamento; Natureza: Pesquisa.Integrantes: Fanny B\u00e9ron – Integrante \/ Pirota, K. R. – Integrante \/ Knobel, M. – Coordenador \/ Edilso Reguera – Integrante.
\nFinanciador(es): Conselho Nacional de Desenvolvimento Cient\u00edfico e Tecnol\u00f3gico – Aux\u00edlio financeiro.<\/p>\n<\/div>\n<\/div>\n

<\/a><\/p>\n

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2008 – 2013<\/b><\/div>\n<\/div>\n
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Significa\u00e7\u00e3o f\u00edsica das curvas de invers\u00e3o da primeira ordem (FORC)<\/div>\n<\/div>\n
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\u00a0<\/b><\/div>\n<\/div>\n
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Situa\u00e7\u00e3o: Conclu\u00eddo; Natureza: Pesquisa.<\/p>\n

Integrantes: Fanny B\u00e9ron – Coordenador.
\nFinanciador(es): Funda\u00e7\u00e3o de Amparo \u00e0 Pesquisa do Estado de S\u00e3o Paulo – Bolsa.
\nN\u00famero de produ\u00e7\u00f5es C, T & A: 34 \/ N\u00famero de orienta\u00e7\u00f5es: 3<\/p>\n<\/div>\n<\/div>\n

<\/a><\/p>\n

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2003 – 2009<\/b><\/div>\n<\/div>\n
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Development of soft ferromagnetic nanowire arrays for high frequency devices<\/div>\n<\/div>\n
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\u00a0<\/b><\/div>\n<\/div>\n
\n
Situa\u00e7\u00e3o: Conclu\u00eddo; Natureza: Pesquisa.
\nAlunos envolvidos: Mestrado acad\u00eamico: (1) Doutorado: (4) .Integrantes: Fanny B\u00e9ron – Integrante \/ M\u00e9nard, D. – Integrante \/ Yelon, Arthur – Coordenador \/ Clime, Liviu – Integrante \/ Ciureanu, Mariana – Integrante \/ Cochrane, Robert W. – Integrante \/ OVARI, T – Integrante \/ NORMANDIN, F – Integrante \/ VERES, T – Integrante \/ Louis-Philippe Carignan – Integrante \/ Vincent Boucher – Integrante \/ Mathieu Lachance – Integrante.
\nFinanciador(es): Conseil de recherches en sciences naturelles et en g\u00e9nie du Canada – Bolsa \/ Ecole Polytechnique de Montreal – Remunera\u00e7\u00e3o \/ Fonds Qu\u00e9b\u00e9cois de la Recherche sur la Nature et les Technologies – Bolsa.
\nN\u00famero de produ\u00e7\u00f5es C, T & A: 55 \/ N\u00famero de orienta\u00e7\u00f5es: 3<\/p>\n<\/div>\n<\/div>\n

<\/p>","protected":false},"excerpt":{"rendered":"

2014 – Atual Magnetic antidots \u00a0 Descri\u00e7\u00e3o: This project concerns the fabrication and characterization of ferromagnetic antidots arrays (composed by transition metal from the Iron group and their alloys) focusing on the dependence of the magnetic properties on the short and long range order, by controlling the symmetry of the array, the hole diameter, and … <\/p>\n

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