Zobrazeno 1 - 10 of 34 pro vyhledávání: '"Geshev, Julian Penkov"'
1
Exchange‑bias and magnetic anisotropy felds in core–shell ferrite nanoparticles
Autor: Silva, Franciscarlos Gomes da, Depeyrot, J., Raikher, Yuriy, Stepanov, Victor, Poperechny, Igor, Souza, Renata Aquino da Silva de, Ballon, Geraldine, Geshev, Julian Penkov, Dubois, Emmanuelle, Perzynski, Régine
Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
Exchange bias properties of MnFe2O4@γ–Fe2O3 core–shell nanoparticles are investigated. The measured feld and temperature dependencies of the magnetization point out a well-ordered ferrimagnetic core surrounded by a layer with spin glass-like arr
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2
Observation of recoil magnetization curves outside the major loop in Co, Fe, and Ni films
Autor: Geshev, Julian Penkov, Garcia, Wagner Jesus da Silva, Paes, Vagner Zeizer Carvalho, Azeredo, Lucas Felipe Santos de, Dorneles, Lucio Strazzabosco, Andrade, Antonio Marcos Helgueira de
Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
We report a peculiar magnetization reversal observed in magnetron-sputtered Co, Fe, and Ni films. We found that some recoil (minor) magnetization curves lie entirely and way outside the major loop, a phenomenon referred to here as a recoil-curve over
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3
Metal activated carbon as an efficient filler for high‐density polyethylene nanocomposites
Autor: Nisar, Muhammad, Thue, Pascal Silas, Maghous, Myriam B., Geshev, Julian Penkov, Lima, Éder Cláudio, Einloft, Sandra Mara Oliveira
Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
interesting properties of magnetic nanocomposites have attracted attention of both academic and industrial researchers. In this work, thermal, mechanical, morphological, and magnetic properties of polyethylene (PE) nanocomposites were inspected using
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4
Polysulfone metal-activated carbon magnetic nanocomposites with enhanced CO2 capture
Autor: Nisar, Muhammad, Thue, Pascal Silas, Maghous, Myriam B., Geshev, Julian Penkov, Lima, Éder Cláudio, Einloft, Sandra Mara Oliveira
Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
In the present study, polysulfone (PSF)-activated carbon nanocomposites were synthesized by a melt mixing technique. Here, 2 wt% activated carbon (CA, CA–Ni, and CA–Co) was used as filler, and effects on thermal, mechanical, magnetic, morphologic
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5
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
Autor: 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
Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
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 or permalloy (Py), thin SL or
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6
Direct observation of multivalent states and 4f → 3d charge transfer in Ce-doped yttrium iron garnet thin films
Autor: Vasili, Hari Babu, Casals, Blai, Cichelero, Rafael, Macià, Ferran, Geshev, Julian Penkov, Gargiani, Pierluigi, Valvidares, Manuel, Herrero-Martín, Javier, Pellegrin, Eric, Fontcuberta Griño, Josep, Herranz, Gervasi
Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
Due to their large magneto-optic responses, rare-earth-doped yttrium iron garnets, Y3Fe5O12 (YIG), are highly regarded for their potential in photonics and magnonics. Here, we consider the case of Ce-doped YIG (Ce-YIG) thin films, in which substituti
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8
Magnetic-field-dependent morphology of self-organized Fe on stepped Si(111) surfaces
Autor: Santos, Mauricio Cougo dos, Geshev, Julian Penkov, Pereira, Luis Gustavo, Schmidt, Joao Edgar
Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
The present work reports on Fe thin films grown on vicinal Si(111) substrates via rf magnetron sputtering. The dependencies of the growth mode and magnetic properties of the obtained iron nanostructures on both crystallographic surface orientation an
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9
Discrimination between coupling and anisotropy fields in exchange-biased bilayers
Autor: Geshev, Julian Penkov, Nicolodi, Sabrina, Silva, Ricardo Barreto da, Nogués Sanmiquel, Josep, Skumryev, Vassil, Baró, Maria Dolors
Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
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 and the antiferromagnet
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10
Impact of magnetization easy-axis distributions on the ferromagnet-antiferromagnet exchange-coupling estimation
Autor: Geshev, Julian Penkov, Nicolodi, Sabrina, Pereira, Luis Gustavo, Schmidt, Joao Edgar, Skumryev, Vassil, Suriñach, Santi, Baró, Maria Dolors
Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
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 measurements. We show,
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