Zobrazeno 1 - 10
of 38
pro vyhledávání: '"J.C.P. Campoy"'
Autor:
C.B.R. Jesus, J.C.P. Campoy, R.H. Honda, E.J.R. Plaza, N.C. Silva, M.O.S. Xavier, P. G. Pagliuso
Publikováno v:
Journal of Alloys and Compounds. 785:1215-1221
The tetragonal ferromagnetic single crystal P r C u 9 S n 4 is considered to be a material with a strong uniaxial magnetic anisotropy. The paramagnetic Curie temperatures suggest axial ferromagnetic and basal antiferromagnetic interactions. In order
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::200328fecf4d758f6fd4e46825f59ac1
https://doi.org/10.1016/j.jallcom.2019.01.173
https://doi.org/10.1016/j.jallcom.2019.01.173
Publikováno v:
Journal of Alloys and Compounds. 730:7-11
The isothermal evolution of magnetization under different magnetic fields, described by an equation of state, not only defines de entropy change Δ S ( T ) (magnetocaloric effect) but also the cooling power (area enclosed by the Δ S ( T ) curve). In
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::52161f5891bfa3f8375412c9cc74caf0
https://doi.org/10.1016/j.jallcom.2017.09.215
https://doi.org/10.1016/j.jallcom.2017.09.215
Publikováno v:
Journal of Magnetism and Magnetic Materials. 409:45-49
In this paper, we present theoretical investigations on the conventional and anisotropic magnetocaloric effects in the cubic HoAl2 ferromagnetic compound. They are investigated in terms of a Hamiltonian that takes into account the Zeeman and exchange
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::04f0ff866e5ef1420cd464b8cfe82ee8
https://doi.org/10.1016/j.jmmm.2016.02.085
https://doi.org/10.1016/j.jmmm.2016.02.085
Publikováno v:
Journal of Alloys and Compounds. 632:122-125
We have studied the field-induced additional exchange-entropy on an elastic ferromagnet as a response effect of the dependence of its bulk modulus with temperature. We consider that the temperature dependence of the bulk modulus follows a linear beha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::84c01a0c2ad32feffbacdf453010236a
https://doi.org/10.1016/j.jallcom.2015.01.151
https://doi.org/10.1016/j.jallcom.2015.01.151
Publikováno v:
Intermetallics. 75:51-53
We report a correlation between magnetoresistivity Δρ mag and magnetic entropy change ΔS mag for specified crystallographic directions of a HoAl 2 single crystal. This ferromagnetic compound shows differentiated behavior among the members of the R
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::99e4afc7049b1e9c0fc787157a0741e6
https://doi.org/10.1016/j.intermet.2016.05.005
https://doi.org/10.1016/j.intermet.2016.05.005
Autor:
J.C.P. Campoy, Lisandro Pavie Cardoso, A.O. dos Santos, M. T. Raposo, Andrea Paesano, José Domingos Fabris
Publikováno v:
Hyperfine Interactions. 195:191-197
We report the structural characterization of Gd5Ge2(Si1 − xSnx)2 (x = 0.23 and x = 0.40) compounds by means of 100 and 298 K-X-ray diffractometry (XRD) and 4 K-155Gd and 298 K-119Sn Mossbauer spectroscopy. These compounds order ferromagnetically at
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::10b1e41b4a7053eacefdeba1d3488451
https://doi.org/10.1007/s10751-009-0119-1
https://doi.org/10.1007/s10751-009-0119-1
Autor:
E.J.R. Plaza, J.C.P. Campoy
Publikováno v:
Journal of Magnetism and Magnetic Materials. 321:446-449
We have studied anomalous peaks observed in magnetocaloric −Δ S ( T ) curves for systems that undergo first-order magnetostructural transitions. The origin of those peaks, which can exceed the conventional magnetic limit, R ln(2 J +1), is discusse
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f83c9ef5226e9d0526d66b06729530d5
https://doi.org/10.1016/j.jmmm.2008.10.001
https://doi.org/10.1016/j.jmmm.2008.10.001
Autor:
Fabiana Cristina Nascimento, M.C. Pereira, Sergio Gama, A. I. C. Persiano, Lisandro Pavie Cardoso, M. T. Raposo, J.C.P. Campoy, José Domingos Fabris, E. J. R. Plaza, Adelino A. Coelho
Publikováno v:
Journal of Magnetism and Magnetic Materials. 316:368-371
We report a study about the structural properties of polycrystalline samples of nominal composition Gd 5 Ge 2 (Si 1− x Sn x ) 2 ( x =0.23, 0.40) that closely influence their physical behavior particularly related to electric resistivity and magneto
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::31889861718885324807cf26bff0d72f
https://doi.org/10.1016/j.jmmm.2007.03.023
https://doi.org/10.1016/j.jmmm.2007.03.023
Publikováno v:
Journal of Magnetism and Magnetic Materials. :2154-2156
X-ray multiple diffraction technique using synchrotron radiation is applied to characterize the PrAl 2 magnetocaloric compound. Renninger scans ( φ -scans) of the (0 0 2) primary reflection were measured in the Brazilian Synchrotron Laboratory (LNLS
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::efac4a3bcff9e5f2ead350e1e3941689
https://doi.org/10.1016/j.jmmm.2003.12.872
https://doi.org/10.1016/j.jmmm.2003.12.872
Publikováno v:
Journal of Magnetism and Magnetic Materials. :834-836
Polycrystalline samples of the Sm 0.35 Nd 0.35 Pb 0.35 Mn 1 -xCoxO3 (x = 0, 0.1, 0.2) at low magnetic fields has been studied by AC susceptibility, and field cooled and zero field cooled magnetisation measurements. We conclude that a small amount of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::10028440277404abb17011052e199619
https://doi.org/10.1016/s0304-8853(01)00078-6
https://doi.org/10.1016/s0304-8853(01)00078-6