Zobrazeno 1 - 10
of 45
pro vyhledávání: '"Xavier Gratens"'
Publikováno v:
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
In intrinsic magnetic semiconductors, the absorption of a single photon can generate a spin polaron, whose magnetic moment reaches many thousands of Bohr magnetons [1.2]. Here we investigate photoinduced spin polarons, using Monte Carlo simulations.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d33159f7fa17ef4ad8b7a1a6123cdcfc
https://doi.org/10.1103/physrevb.103.035202
https://doi.org/10.1103/physrevb.103.035202
Autor:
André Bohomoletz Henriques, Jagadeesh S. Moodera, Xavier Gratens, Yunbo Ou, Paulo H. O. Rappl
Publikováno v:
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
We find that in the ferromagnetic semiconductor EuS, near its Curie temperature, a single band-edge photon generates a spin polaron (SP), whose magnetic moment approaches 20,000 Bohr magnetons. This is much larger than the supergiant photoinduced SPs
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::075928befb4c7efb3f3f22bac43aa00d
http://arxiv.org/abs/2003.12956
http://arxiv.org/abs/2003.12956
Autor:
F. H. Aragón, Ismael Gonzales, Xavier Gratens, Valmir Antonio Chitta, Paulo C. Morais, Jose A. H. Coaquira, Waldemar A. A. Macedo, J. C. R. Aquino
Publikováno v:
The Journal of Physical Chemistry C. 121:21670-21677
The present study reports the successful synthesis of Sn1–xCrxO2 nanoparticles with doping content (x) ranging from 0 to 0.20. Samples were synthesized by a polymer precursor method using SnCl2·H2O and Cr(NO3)3·5H2O as metal ion suppliers. In all
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::069f5eadc476499d08c1d992261165a9
https://doi.org/10.1021/acs.jpcc.7b06054
https://doi.org/10.1021/acs.jpcc.7b06054
Autor:
Caio Perecin, Natalia Cerize, Valmir Chitta, Xavier Gratens, Patricia Léo, Adriano de Oliveira, Sergio Yoshioka
Publikováno v:
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
In this work, microstructural and optical characterization of single and multilayers of ZnO films intended for thin film transistors is presented. ZnO films from one to five layers were processed by chemical bath deposition at 70°C during 90 minutes
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2157574e79b578c5506ccf9ccbaddd03
https://doi.org/10.5923/j.nn.20160604.03
https://doi.org/10.5923/j.nn.20160604.03
Autor:
Valmir Antonio Chitta, Xavier Gratens, Gunther Springholz, André Bohomoletz Henriques, P. A. Usachev
Publikováno v:
Physical review letters. 120(21)
We demonstrate that light resonant with the band gap forces the antiferromagnetic semiconductor EuSe to enter ferromagnetic alignment in the picosecond timescale. A photon generates an electron-hole pair, whose electron forms a supergiant spin polaro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a9e3183f440c77345205f1910444891e
https://pubmed.ncbi.nlm.nih.gov/29883133
https://pubmed.ncbi.nlm.nih.gov/29883133
Autor:
Xavier Gratens, Hugo Bonette de Carvalho, Gul Rahman, Antonio C. Doriguetto, Valmir Antonio Chitta, Víctor M. García-Suárez, Juliana M. Morbec, Angela O. de Zevallos, Maria Inês Basso Bernardi, Rafael Tomaz da Silva, Alexandre Mesquita, T. Chiaramonte
Publikováno v:
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP
Universidade de São Paulo (USP)
instacron:USP
In this report we present a systematic structural and magnetic analysis of Co-doped ZnO nanoparticles prepared via a microwave-assisted hydrothermal route. The structural data confirm the incorporation of Co ions into the wurtzite ZnO lattice and a C
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::20374f76c9bac3a324e1ef5a64657c57
Effects of Ultrasonic Agitation on the Structural and Magnetic Properties of CoFe 2 O 4 Nanocrystals
Autor:
José Fernando Condeles, Noelio O. Dantas, R.S. Silva, Xavier Gratens, Valmir Antonio Chitta, Sinésio Domingues Franco, Anielle Christine Almeida Silva
Publikováno v:
European Journal of Inorganic Chemistry. 2014:5603-5608
Cobalt ferrite nanocrystals (CoFe2O4) were synthesized by means of ultrasonic agitation and afterward subjected to different annealing temperatures. The structural and morphological properties of the nanocrystals were investigated by means of X-ray d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::05aa27d74457c1c55cee47fccf17fb08
https://doi.org/10.1002/ejic.201402563
https://doi.org/10.1002/ejic.201402563
Autor:
Xavier Gratens, S. C. P. van Kooten, Valmir Antonio Chitta, P. A. Usachev, Gunther Springholz, André Bohomoletz Henriques, A. R. Naupa
Publikováno v:
Journal of Applied Physics. 126:095701
We present a simple semiclassical model to sustain that in europium chalcogenides (EuX), Faraday rotation (FR) in the transparency gap is proportional to the magnetization of the sample, irrespective of the material’s magnetic phase, temperature, o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::70692ac3efde5fb44b9bf040c981ea2e
https://doi.org/10.1063/1.5116150
https://doi.org/10.1063/1.5116150
Autor:
A. O. de Zevallos, Xavier Gratens, Antônio Claret Soares Sabioni, V. M. De Almeida, Antonio C. Doriguetto, Valmir Antonio Chitta, Alexandre Mesquita, P. P. Neves, H. B. de Carvalho, Niko Churata Mamani, W. B. Ferraz
Publikováno v:
Web of Science
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Made available in DSpace on 2018-11-26T16:17:26Z (GMT). No. of bitstreams: 0 Previous issue date: 2016-01-15 Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) C
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::010836da1b27c640b129a311759074a3
Publikováno v:
Journal of Magnetism and Magnetic Materials. 324:2761-2764
The magnetic susceptibility of Pb1-xCexA (A=S, Se and Te) crystals with Ce3+ concentrations 0.006≤x≤0.036 was investigated in the temperature range from 2 K to 300 K. The magnetic susceptibility data was found to be consistent with a 2F5/2 lowest
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e1c694bb8e9db60c4ef69695e12607bb
https://doi.org/10.1016/j.jmmm.2012.04.004
https://doi.org/10.1016/j.jmmm.2012.04.004