Navegação Ciências Exatas e da Terra por Assunto "Propriedades magnéticas"
Resultados 1-20 de 20
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Calculation of the temperature dependence of the giant mr and application to Co/Cu multilayers
(1994) [Artigo de periódico]Most theoretical models of the giant magnetoresistance (GMR) in metallic magnetic multilayers developed up to now are for the zero-temperature limit, thus neglecting the spin-flip scattering arising from spin fluctuations ... -
Comment on “Exchange bias in the layered cobaltite Sr1.5Pr0.5CoO4” [J. Appl. Phys. 104, 023914 (2008)]
(2009) [Artigo de periódico]Ang et al. J. Appl. Phys. 104, 023914 2008 recently reported magnetization hysteresis loops shifted along both field and magnetization axes of layered cobaltites. The authors claimed that these shifts are characteristics ... -
De Haas-van Alphen oscillations and magnetic breakdown : semiclassical calculation of multiband orbits
(1998) [Artigo de periódico]We use an algebraic method to compute de Haas–van Alphen oscillations in two-dimensional systems in the semiclassical approximation for cases where the Fermi surface lies on more than one sheet of the energy surface. We ... -
Electronic structure and magnetization of Fe-Co alloys and multilayers
(1999) [Artigo de periódico]The magnetic properties and electronic structure of bcc Fe–Co alloys and multilayers are investigated with the first-principles molecular cluster discrete variational method. The density of states and the contact interactions ... -
Engineering double-shifted hysteresis loops in Co/IrMn/Cu/Co films
(2009) [Artigo de periódico]Co 3 nm /IrMn 15 nm /Cu dCu /Co 7 nm films were subjected to magnetic annealing where its temperature and duration as well as the direction and amplitude of the applied field were varied. We demonstrate that the exchange-bias ... -
Epitaxial spin-valve structures for ultra-low-field detection
(1994) [Artigo de periódico]A new epitaxial “spin-valve”-type system for low-field magnetoresistive detection is described. This system is based on FeiPd epitaxial multilayers grown on (100)MgO by MBE. These films show a very abrupt transition from ... -
Interplay between coarsening and nucleation in an Ising model with dipolar interactions
(2008) [Artigo de periódico]We study the dynamical behavior of a square lattice Ising model with exchange and dipolar interactions by means of Monte Carlo simulations. After a sudden quench to low temperatures, we find that the system may undergo a ... -
Low-dimensional magnetic properties of orthorhombic MnV2O6 : a nonstandard structure stabilized at high pressure
(2017) [Artigo de periódico] -
Low potential barrier height effects in magnetic tunneling junctions
(2007) [Artigo de periódico]This paper reports on the study of deposited (Ni81Fe19/AlOx /Co) magnetic tunnel junctions by magnetron sputtering, with the insulating layer obtained by plasma oxidation of Al. Concentration of the tunnel current in small ... -
Magnetic and structural properties of Fe-implanted cubic GaN
(2016) [Artigo de periódico]In this article, we report on structural and magnetic properties of cubic GaN epitaxial layers implanted with Fe ions and subsequently subjected to thermal annealing. The epitaxial quality of the layers was studied by X-ray ... -
Magnetic and structural properties of ion nitrided stainless steel
(2009) [Artigo de periódico]The magnetic properties and crystalline structure of expanded austenite obtained by ion beam nitriding of AISI 316 steel are investigated. Magnetic force microscopy reveals that the nitrogen expanded austenite has two ... -
Magnetism and quantum phase transitions in spin-1/2 attractive fermions with polarization
(2009) [Artigo de periódico]An extensive investigation is given for magnetic properties and phase transitions in one-dimensional (1D) Bethe ansatz integrable spin-1/2 attractive fermions with polarization by means of the dressed energy formalism. An ... -
Magnetometria in-situ para caracterização de materiais eletrodepositados
(2019) [Artigo de periódico]We have recently made studies of electrodeposits of Co onto graphene attached to different substrates, successfully performed via in-situ magnetization measurements. The magnetic analysis of deposits as a function of time ... -
Metal activated carbon as an efficient filler for high‐density polyethylene nanocomposites
(2020) [Artigo de periódico]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) ... -
Negative remanent magnetization of fine particles with competing cubic and uniaxial anisotropies
(1998) [Artigo de periódico]The magnetic properties of noninteracting single-domain particles whose anisotropy is made up of a cubic magnetocrystalline and a uniaxial components were investigated. Various directions of the uniaxial anisotropy were ... -
Negative rotatable anisotropy in IrMn/Cr/Co thin films
(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, ... -
Peculiarity of a magnetic structure in a quasi-one-dimensional columbite Co0.4Ni0.6Nb2O6
(2020) [Artigo de periódico]Quasi-one-dimensional (Q1D) spin chain systems have great potential applications in high-density information storage devices, quantum information and computers, because of their quantum magnetism properties. The low-dimensional ... -
Quasi-one-dimensional magnetic properties of NiNb2−xVxO6 compounds synthesized at high pressure in a nonstandard columbite-type structure
(2021) [Artigo de periódico]We report on the low-dimensional magnetic behavior of the series of compounds NiNb2−xVxO6 (0 x 2), with a columbite-type crystal structure stabilized at high pressure and temperature. Based on susceptibility, magnetization, ... -
Rare-earth spin-glasses with uniaxial anisotropy
(1984) [Artigo de periódico]The properties of spin-glasses with uniaxial anisotropy are investigated by magnetization measurements on single crysta1s of Y and Se doped with Er, Dy, Tb, or Gd impurities. In alloys with strong anisotropy, spin-glass ... -
The magnetization of epitaxial nanometric CoFe2O4(001) layers
(2009) [Artigo de periódico]We have studied the magnetic anisotropy of nanometric CoFe2O4 (CFO) thin films grown on (100) SrTiO3 (STO) substrates. It has been found that epitaxial substrate-induced compressive strain makes the normal-to-film axis ...
