Search Results - "Varalda, J"

Ferromagnetism in heavily Fe-doped GaAs: a DFT study by Zarpellon, J, Mosca, D H, Varalda, J

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Spin disorder effect in anomalous Hall effect in MnGa by Mendonça, A.P.A., Varalda, J., Schreiner, W.H., Mosca, D.H.

“…•Experimental and theoretical analysis of the anomalous Hall effect in MnGa thin films.•DFT calculations were performed to determine the intrinsic Berry…”
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Strain-induced magnetization changes and magneto-volume effects in ferromagnets with cubic symmetry by Paes, V.Z.C., Varalda, J., Mosca, D.H.

“…•Forced magnetostriction in thin films and bulk of iron and nickel.•Strain dependence of the magnetic moment induces a forced magnetostriction.•First-principle…”
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Oxygen diffusion and vacancy migration thermally-activated govern high-temperature magnetism in ceria by Varalda, J., Dartora, C. A., de Camargo, P. C., de Oliveira, A. J. A., Mosca, D. H.

“…Several experimental works currently demonstrate that metallic nano-oxides and carbon nanomaterials expected to be diamagnets, in fact, behave as ferromagnets…”
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Laser irradiation of iron, cobalt, and nickel targets in liquid nitrogen: A facile approach for nitride nanoparticle fabrication of ferromagnetic transition metals by Gubert, G., Ribeiro, E., Varalda, J., Bezerra, A.G., Schreiner, W.H., Mosca, D.H.

“…Nitride nanoparticles of ferromagnetic metal elements were produced by laser irradiation from metallic targets immersed in liquid nitrogen using Nd:YAG lasers…”
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Non-conventional ferromagnetism and high bias magnetoresistance in TiO2-x: A simple phenomenological approach by Paes, V.Z.C., Mosca, D.H., de Oliveira, A.J.A., Varalda, J.

“…•Room temperature ferromagnetism in oxygen-defective oxide.•Magnetization and magnetoresistance computational simulations.•Spin-polarized electronic-defective…”
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Magnetic and structural properties of Mn5+xGe3+y thin films as a function of substrate orientation by Cardoso de Oliveira, R., Demaille, D., Casaretto, N., Zheng, Y.J., Marangolo, M., Mosca, D.H., Varalda, J.

“…•The phase and orientation are independent of the Mn effusion cell temperature.•The layer is evenly covered with Mn and the TEM shows no other Mn-rich…”
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Tuning Fe3O4 nanoparticle dispersion through pH in PVA/guar gum/electrospun membranes by Lubambo, A.F., Ono, L., Drago, V., Mattoso, N., Varalda, J., Sierakowski, M.-R., Sakakibara, C.N., Freitas, R.A., Saul, C.K.

“…•PVA/guar gum membranes with four different loads of Fe3O4 nanoparticles were electrospun.•Membranes were produced using two types of solution: alkaline and…”
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Effect of Thermal Annealing on the Stoichiometry and Magnetism of Mn–Ga Thin Films by da Cruz, C, de Oliveira, R. C, Neckel, I. T, Mosca, D. H, Varalda, J

“…Mn x Ga thin films (1.64 ≤ x ≤ 2) were grown at room temperature by molecular beam epitaxy on the native SiO2 layer of Si(100) commercial wafers. After growth,…”
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Goethite (α-FeOOH) magnetic transition by ESR, Magnetometry and Mössbauer by Valezi, D.F., Piccinato, M.T., Sarvezuk, P.W.C., Ivashita, F.F., Paesano, A., Varalda, J., Mosca, D.H., Urbano, A., Guedes, C.L.B., Di Mauro, E.

“…A natural sample of the mineral goethite was characterized by X-band Electron Spin Resonance (ESR), vibrating sample Magnetometry and Mössbauer spectroscopy…”
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Structure and Magnetism of MnGa Ultra-Thin Films on GaAs(111)B by Arins, A. W., Jurca, H. F., Zarpellon, J., Varalda, J., Graff, I. L., Schreiner, W. H., Mosca, D. H.

“…MnGa alloys with compositions in the range of 52 to 60 at. % Mn were grown by molecular beam epitaxy (MBE) on GaAs(111)B substrates. High quality epilayers…”
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Correlation between tetragonal zinc-blende structure and magnetocrystalline anisotropy of MnGa epilayers on GaAs(111) by Arins, A.W., Jurca, H.F., Zarpellon, J., Fabrim, Z.E., Fichtner, P.F.P., Varalda, J, Schreiner, W.H., Mosca, D.H

“…MnGa films of few nanometer thickness with tetragonal zinc-blende (TZB) structure were grown by molecular beam epitaxy on GaAs(111) substrates. These ultrathin…”
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Monte Carlo simulations of magnetization state of ellipsoidal CoCu particles in disordered self-assembled arrays by Paes, V.Z.C., Varalda, J., Schio, P., Matsushima, J.T., Pereira, E.C., de Oliveira, A.J.A., Mosca, D.H.

“…Monte Carlo (MC) simulations of the magnetization states of disordered self-assembled arrays of particles consisting of Co87Cu13 alloy are investigated. The…”
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Study of thermally activated reaction between Mn and GaAs(111) surface by Soares, M.V., Jurca, H.F., Zarpellon, J., Varalda, J., Schreiner, W.H., Mosca, D.H.

“…We investigate the chemical reactivity of ultra-thin films of Mn on As-terminated (111) GaAs surface kept at ultra-high vacuum conditions in the temperature…”
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Magnetic and electronic properties of rare earth free Fe5Ge3 magnets by Melenek, N., Varalda, J.

“…Calculations based on density functional theory have been performed to investigate the potential of the rare earth free Fe5Ge3 magnets for applications in…”
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Discrimination of vibrational modes in Ni2MnGa thin films by Salvador, A.J., Neckel, I.T., Galante, D., Varalda, J., Mosca, D.H.

“…Vibrational properties in magnetic shape memory alloys are intrinsically connected to the topologies formed due to temperature-dependent breakdown of symmetry…”
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Structural and magnetic anisotropies of Fe/ZnSe(001) thin films by MARANGOLO, M, GUSTAVSSON, F, GEORGE, J.-M, GUICHAR, G. M, EDDRIEF, M, VARALDA, J, ETGENS, V. H, RIVOIRE, M, GENDRON, F, MAGNAN, H, MOSCA, D. H

“…The morphology, the atomic structure, and the strain of very thin Fe epilayers grown on ZnSe(001) have been studied by combined scanning tunnel microscope…”
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The influence of substrate orientation on the magnetic behavior of nearly-stoichiometric Mn5Ge3 thin films: DFT calculations and experimental analysis by Oliveira, R.C., Marangolo, M., Mosca, D.H., Varalda, J.

“…The Mn5Ge3 exhibits a wide range of fascinating properties such as high spin polarization up to 42 %, large spin diffusion lengths, near-room Curie…”
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Non-conventional ferromagnetism and high bias magnetoresistance in TiO 2 - x : A simple phenomenological approach by Paes, V.Z.C., Mosca, D.H., de Oliveira, A.J.A., Varalda, J.

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Room temperature ferromagnetism in oxygen-deficient gallium oxide films with cubic spinel structure by Pichorim, A., Neckel, I.T., de Oliveira, A.J.A., Varalda, J., Mosca, D.H.

“…Oxygen-defective gallium oxide (Ga2O3-x with 0.4 < x < 0.7) thin films with cubic spinel structure were deposited on c-cut epi-polished sapphire wafers using…”
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