Zobrazeno 1 - 10
of 52
pro vyhledávání: '"Magnus G. Carvalho, A."'
Autor:
von Ranke, P.J., de Oliveira, N.A., de Sousa, V.S.R., Garcia, D.C., de Oliveira, Isaías G., Magnus G. Carvalho, A., Gama, S.
Publikováno v:
In Journal of Magnetism and Magnetic Materials 2007 313(1):176-181
Autor:
B.P. Alho, P.O. Ribeiro, A. Magnus G. Carvalho, E.P. Nóbrega, A. Caldas, P. H. O. Lopes, V.S.R. de Sousa, P.J. von Ranke, T.S.T. Alvarenga
Publikováno v:
Journal of Magnetism and Magnetic Materials. 442:265-269
We report the anisotropy of magnetic field-induced entropy change in rare earth Er 1 - y Tb y Al 2 compounds (y = 0.00, 0.25, 0.50, 0.75 and 1.00). In the present work, we use a model Hamiltonian that includes the crystalline electrical field anisotr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c1dbf0ba81961b3fc80504726dc45280
https://doi.org/10.1016/j.jmmm.2017.06.120
https://doi.org/10.1016/j.jmmm.2017.06.120
Autor:
R.J. Caraballo Vivas, J.C.G. Tedesco, Mario S. Reis, D.L. Rocco, S.S. Pedro, C. Cruz, Adelino A. Coelho, A. Magnus G. Carvalho
Publikováno v:
Materials Chemistry and Physics. 174:23-27
Heusler alloys are widely studied due to their interesting structural and magnetic properties, like magnetic shape memory ability, coupled magneto-structural phase transitions and half-metallicity; ruled, for many cases, by the valence electrons numb
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8661f4692a8efadb27f956a1fcde08ea
https://doi.org/10.1016/j.matchemphys.2016.02.045
https://doi.org/10.1016/j.matchemphys.2016.02.045
Autor:
T.S.T. Alvarenga, B.P. Alho, A. Magnus G. Carvalho, N.A. de Oliveira, P.J. von Ranke, E.P. Nóbrega, V.S.R. de Sousa, P.O. Ribeiro, A. Caldas
Publikováno v:
Journal of Magnetism and Magnetic Materials. 379:112-116
We report on the magnetic and magnetocaloric effect calculations in rare earth Er 1− y Tb y Al 2 compounds ( y =0.00, 0.25, 0.5, 0.75 and 1.00). Our model Hamiltonian has contributions of the crystalline electrical field anisotropy in both Er and T
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f3954e7cc89b531f8e06a72c9832bd5a
https://doi.org/10.1016/j.jmmm.2014.12.023
https://doi.org/10.1016/j.jmmm.2014.12.023
Autor:
V.S.R. de Sousa, A. Magnus G. Carvalho, N.A. de Oliveira, P. H. O. Lopes, P.J. von Ranke, T.S.T. Alvarenga, E.P. Nóbrega, P.O. Ribeiro, A. Caldas, B.P. Alho
Publikováno v:
Journal of Magnetism and Magnetic Materials. 369:34-39
We report theoretical investigations on the magnetic entropy changes in amorphous systems through two different assumptions. In the first assumption, the HPZ-anisotropic model is considered to deal with the random direction of magnetic moments, where
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::81d5ba937a6d95a4d4c9d567928b739a
https://doi.org/10.1016/j.jmmm.2014.06.026
https://doi.org/10.1016/j.jmmm.2014.06.026
Autor:
T.S.T. Alvarenga, P.O. Ribeiro, V.S.R. de Sousa, P.J. von Ranke, A. Magnus G. Carvalho, B.P. Alho, N.A. de Oliveira, A. Caldas, E.P. Nóbrega
Publikováno v:
Journal of Magnetism and Magnetic Materials. 341:138-141
One of the biggest challenges in materials science is to understand the microscopic mechanisms responsible in storage and release material entropy. TbN compound, which presents non-degeneracy in ground state, was studied and the calculated magnetocal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d2db7ddeed2c7fb723fe31f6b04538a4
https://doi.org/10.1016/j.jmmm.2013.04.035
https://doi.org/10.1016/j.jmmm.2013.04.035
Autor:
C. A. Ponte, Jiří Kaštil, C. Salazar Mejía, A. Magnus G. Carvalho, A. M. Gomes, L. E. L. Silva, J. Kamarád
Publikováno v:
Applied Physics A. 122
In this work, we present a methodology to obtain the adiabatic temperature change from non-adiabatic measurements, which combines a homemade calorimetric device (used to measure the temperature change of magnetic materials) and a thermodynamic model
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::41caf67f9251b82cc453dc8009d182bd
https://doi.org/10.1007/s00339-016-9775-6
https://doi.org/10.1007/s00339-016-9775-6
Autor:
A. de Campos, L.M. da Silva, A. Magnus G. Carvalho, P.J. von Ranke, D.L. Rocco, Adelino A. Coelho, A.O. dos Santos, M. S. da Luz, N.A. de Oliveira, Lisandro Pavie Cardoso, Juander Antônio de Oliveira Souza, Sergio Gama
Publikováno v:
Physical Review B. 93
This paper presents the results of an investigation of the magnetic and structural properties of ${\text{Mn}}_{1\ensuremath{-}x}{\text{Fe}}_{x}\text{As}$ compounds under hydrostatic pressure and chemical doping. The chemical doping was performed by u
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c9c04caefcb3ae592e2b74cc9766a272
https://doi.org/10.1103/physrevb.93.054431
https://doi.org/10.1103/physrevb.93.054431
Autor:
V.S.R. de Sousa, P.J. von Ranke, A. Magnus G. Carvalho, Sergio Gama, Adelino A. Coelho, N.A. de Oliveira, B.P. Alho
Publikováno v:
Solid State Communications. 152:951-954
We report the thermal and magnetic hysteresis diagram for MnAs that comes from a microscopic description of a magnetic system through a model Hamiltonian that takes into account the magnetoelastic interaction. The temperature and magnetic hysteresis
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c618a3cad98266fba0dcf5bd2ce8fef6
https://doi.org/10.1016/j.ssc.2012.03.028
https://doi.org/10.1016/j.ssc.2012.03.028
Autor:
P.J. von Ranke, A. Magnus G. Carvalho, T.S.T. Alvarenga, V.S.R. de Sousa, E.P. Nóbrega, B.P. Alho, N.A. de Oliveira
Publikováno v:
Journal of Magnetism and Magnetic Materials. 324:1290-1295
We report on the magnetic and magnetocaloric effect calculations in antiferromagnetic perovskite-type EuTiO 3 . From the isothermal magnetic entropy change calculated upon low magnetic field changes (below 1 T) several results were predicted: inverse
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f3ed40f402aa2ded016871f294f0d28a
https://doi.org/10.1016/j.jmmm.2011.11.037
https://doi.org/10.1016/j.jmmm.2011.11.037