Navegação Artigos de Periódicos por Assunto "Suscetibilidade magnética"
Resultados 1-11 de 11
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Analytical solutions for exchange bias and coercivity in ferromagnetic/antiferromagnetic bilayers
(2000) [Artigo de periódico]Analytical expressions have been derived for the exchange bias field, coercivity, and effective anisotropy field in ferromagnetic/antiferromagnetic bilayers in the framework of a model assuming the formation of a planar ... -
Evidence of spin-density-wave to spin-glass transformation in ynd alloys
(1995) [Artigo de periódico]Low-temperature ac and de magnetic susceptibility and specific-heat measurements have been carried out on YNd di1ute alloys, where the Nd concentrations are 1.9, 2.5, 4.5, 6.8, and 9.0 at. %. The most concentrated alloys ... -
Exact results for the thermal and magnetic properties of strong coupling ladder compounds
(2003) [Artigo de periódico]We investigate the thermal and magnetic properties of the integrable su (4) ladder model by means of the quantum transfer matrix method. The magnetic susceptibility, specific heat, magnetic entropy, and high field magnetization ... -
Field and oxygen dependence of the magnetic irreversibility line in yba(2)cu(3)o(7-g)
(1994) [Artigo de periódico]We report on de magnetic susceptibility measurements in polycrystalline YBa2Cu30 7- δ as a function of the oxygen content in the limit of small δ. We focus mainly on the detailed behavior of the zero-fie1dcooled- field-cooled ... -
Inhomogeneous structure and magnetic properties of granular Co/sub 10/Cu/sub 90/ alloys
(2001) [Artigo de periódico]Granular Co₁₀Cu₉₀ alloys displaying giant magnetoresistance have been obtained by melt spinning followed by an appropriate heat treatment in the range 0–700 °C. Their structural and magnetic properties have been studied ... -
Nematic phase in two-dimensional frustrated systems with power-law decaying interactions
(2013) [Artigo de periódico]We address the problem of orientational order in frustrated interaction systems as a function of the relative range of the competing interactions. We study a spin model Hamiltonian with short-range ferromagnetic interaction ... -
Nonlinear susceptibility of a quantum spin glass under uniform transverse and random longitudinal magnetic fields
(2017) [Artigo de periódico]The interplay between quantum fluctuations and disorder is investigated in a quantum spin-glass model, in the presence of a uniform transverse field , as well as of a longitudinal random field hi , which follows a Gaussian ... -
Quantum spin glass : a replica-symmetric theory with positive entropy
(1986) [Artigo de periódico]In the present paper we present a detailed analysis of quantum effects in the spin-glass transition as described by a quantum Heisenberg analogue of the Sherrington-Kirkpatrick model. The spin operators are represented in ... -
Specific heat and nonlinear susceptibility in spin glasses with random fields
(2019) [Artigo de periódico]We study magnetic properties of spin glass (SG) systems under a random field (RF), based on the suggestion that RFs can be induced by a weak transverse field in the compound LiHo x Y 1 − x F 4 .Weconsideracluster spin model ... -
Spin-glass phase transition and behavior of nonlinear susceptibility in the Sherrington-Kirkpatrick model with random fields
(2016) [Artigo de periódico]The behavior of the nonlinear susceptibility χ3 and its relation to the spin-glass transition temperature Tf in the presence of random fields are investigated. To accomplish this task, the Sherrington-Kirkpatrick model is ... -
Thermodynamic properties of an integrabel quantum spin ladder with boundary impurities
(2003) [Artigo de periódico]An integrable quantum spin ladder based on the SU(4) symmetry algebra with boundary defects is studied in the framework of boundary integrability. Five nontrivial solutions of the reflection equations lead to different ...