The Advanced Magnetic Materials Group perform theoretical, experimental and applied research about magnetic materials with remarkable physical properties, such as coupled magnetic and structural transitions, large magnetocaloric effect and barocaloric effect.

Papers

Selected papers:

 - D. L. Rocco, A. de Campos, A. Magnus G. Carvalho, A. O. dos Santos, L. M. da Silva, S. Gama, M. S. da Luz, P. von Ranke, N. A. de Oliveira, A. A. Coelho, L. P. Cardoso, J. A. Souza, Influence of chemical doping and hydrostatic pressure on the magnetic properties of Mn1−xFexAs magnetocaloric compounds, Phys. Rev. B 93, 054431 (2016).

 - A. Magnus G. Carvalho, C. Salazar Mejía, C. A. Ponte, L. E. L. Silva, J. Kaštil, J. Kamarád, A. M. Gomes, Adiabatic temperature change from non-adiabatic measurements, Appl. Phys. A 122, 246 (2016).

 - P. J. von Ranke, P. O. Ribeiro, A. Magnus G. Carvalho, B. P. Alho, T. S. T. Alvarenga, E. P. Nobrega, A. Caldas, V. S. R. de Sousa, P. H. O. Lopes, N. A. de Oliveira, Theoretical investigation on the magnetic and electric properties in TbSb compound through an anisotropic microscopic model, J. Appl. Phys. 119, 183903 (2016).

 - M. J. M. Pires, W. A. A. Macedo, L. P. Cavalcanti, A. Magnus G. Carvalho, Characterization of Fe–Nb sputtered thin films, J. Phys. Chem. Solids 86, 36 (2015).

 - S. S. Pedro, R. J. Caraballo Vivas, V. M. Andrade, C. Cruz, L. S. Paixão, C. Contreras, T. Costa-Soares, L. Caldeira, A. A. Coelho, A. Magnus G. Carvalho, D. L. Rocco, M. S. Reis, Effects of Ga substitution on the structural and magnetic properties of half metallic Fe2MnSi Heusler compound, J. Appl. Phys. 117, 013902 (2015).

 - P. O. Ribeiro, B. P. Alho, T. S. T. Alvarenga, E. P. Nóbrega, V. S. R. de Sousa, A. Magnus G. Carvalho, A. Caldas, N. A. de Oliveira, P. J. von Ranke, Theoretical investigations on magnetocaloric effect in Er1-yTbyAl2 series, J. Magn. Magn. Mat. 379, 112 (2015).

 - T. S. T. Alvaranega, B. P. Alho, E. P. Nobrega, P. O. Ribeiro, A. Caldas, V. S. R. de Sousa, A. Magnus G. Carvalho, N. A. de Oliveira, P. J. von Ranke, Theoretical investigation on the barocaloric and magnetocaloric properties in the Gd5Si2Ge2 compound, J. Appl. Phys. 116, 243908 (2014).

 - P. J. von Ranke, E. P. Nóbrega, A. Caldas, B. P. Alho, P. O. Ribeiro, T. S. T. Alvarenga, P. H. O. Lopes, V. S. R. de Sousa, A. Magnus G. Carvalho, N. A. de Oliveira, Calculations of the magnetic entropy change in amorphous through a microscopic anisotropic model: Applications to Dy70Zr30 and DyCo3.4 alloys, J. Appl. Phys. 116, 143903 (2014).

- B. P. Alho, P. O. Ribeiro, T. S. T. Alvarenga, A. Magnus G. Carvalho, P. J. von Ranke, Magnetocaloric effect in Gd(1-y)DyyAl2, Int. J. Refrigeration 37,  297-302 (2014).

 - A. Magnus G. Carvalho, J. C. G. Tedesco, M. J. M. Pires, M. E. Soffner, A. O. Guimarães, A. M. Mansanares, A. A. Coelho, Large magnetocaloric effect and refrigerant capacity near room temperature in as-cast Gd5Ge2Si2-xSnx compounds, Appl. Phys. Lett. 102, 192410 (2013).

 - J. C. G. Tedesco, M. J. M. Pires, A. Magnus G. Carvalho, V. S. R. de Sousa, L. P. Cardoso , A. A. Coelho, Exchange-bias-like effect in Pr0.75Tb0.25Al2 and Pr0.7Tb0.3Al2 samples, J. Magn. Magn. Mat. 339, 6-10 (2013).

 - P. J. von Ranke, T. S. T. Alvarenga, E. P. Nóbrega, B. P. Alho, P. O. Ribeiro, A. Magnus G. Carvalho, V. S. R. de Sousa, A. Caldas, N. A. de Oliveira, Investigation on the magnetocaloric effect in TbN compound, J. Magn. Magn. Mat. 341, 138-141 (2013).

 - P. O. Ribeiro, B. P. Alho, T. S. T. Alvarenga, E. P. Nóbrega, A. Magnus G. Carvalho, V. S. R. de Sousa, A. Caldas, N. A. de Oliveira, P. J. von Ranke, Theoretical investigations on the magnetocaloric and barocaloric effects in TbyGd(1-y)Al2 series, J. Alloys Compd. 563, 242-248 (2013).

 - B. P. Alho, N. A. de Oliveira, V. S. R. de Sousa, S. Gama, A. A. Coelho, A. Magnus G. Carvalho, P. J. von Ranke, Theoretical investigation on the magnetocaloric effect in MnAs using a microscopic model to describe the magnetic and thermal hysteresis, Solid State Comm. 152, 951 (2012).

 - B. P. Alho, A. Magnus G. Carvalho, P. J. von Ranke, A discussion on the magnetization calculation in polycrystalline antiferromagnetic system: Application to EuTiO3, J. Magn. Magn. Mat. 324, 210 (2012).

 - P. J. von Ranke, B. P. Alho, E. P. Nóbrega, V. S. R. de Sousa, T. S. T. Alvarenga, A. Magnus G. Carvalho, N. A. de Oliveira, The influence of magnetic and electric coupling properties on the magnetocaloric effect in quantum paraelectric EuTiO3, J. Magn. Magn. Mat. 324, 1290 (2012).

 - B. P. Alho, E. P. Nóbrega, V. S. R. de Sousa, A. Magnus G. Carvalho, N. A. de Oliveira, P. J. von Ranke, Theoretical investigation on the existence of inverse and direct magnetocaloric effect in perovskite EuZrO3, J. Appl. Phys. 109, 083942 (2011).

 - A. Magnus G. Carvalho, A. A. Coelho, P. J. von Ranke, C. S. Alves, The isothermal variation of the entropy (ΔST) may be miscalculated from magnetization isotherms in some cases: MnAs and Gd5Ge2Si2 compounds as examples, J. Alloys Compd. 509, 3452 (2011).

 - V. S. R. de Sousa, A. Magnus G. Carvalho, E. J. R. Plaza, B. P. Alho, J. C. G. Tedesco, A. A. Coelho, N. A. de Oliveira, P. J. von Ranke, Investigation on the magnetocaloric effect in (Gd,Pr)Al2 solid solutions, J. Magn. Magn. Mat. 323, 794 (2011).

 - B. P. Alho, N. A. de Oliveira, V. S. R. de Sousa, E. J. R. Plaza, A. Magnus G. Carvalho, P. J. von Ranke, The influence of the magnetoelastic interaction on the magnetocaloric effect in ferrimagnetic systems: a theoretical investigation, J. Phys.: Condens. Matter 22, 486008 (2010).

 - M. E. Soffner, A. M. Mansanares, F. C. G. Gandra, A. A. Coelho, S. Gama, A. Magnus G. Carvalho, M. J. M. Pires, A. O. Guimarães, E. C. da Silva, Determination of the entropy change using the acoustic detection technique in the investigation of the magnetocaloric effect, J. Phys. D: Appl. Phys. 43, 445002 (2010).

 - P. J. von Ranke, N. A. de Oliveira, B. P. Alho, V. S. R. de Sousa, E. J. R. Plaza, A. Magnus G. Carvalho, Magnetocaloric effect in ferromagnetic and ferrimagnetic systems under first and second order phase transition, J. Magn. Magn. Mat. 322, 84 (2010).

 - A. O. Guimarães, M. E. Soffner, A. M. Mansanares, A. A. Coelho, A. Magnus G. Carvalho, M. J. M. Pires, S. Gama, E. C. da Silva, Magnetocaloric effect in GdGeSi compounds measured by the acoustic detection technique: Influence of composition and sample treatment, J. Appl. Phys. 107, 073524 (2010).

 - A. O. Guimarães, M. E. Soffner, A. M. Mansanares, A. A. Coelho, A. Magnus G. Carvalho, M. J. M. Pires, S. Gama, E. C. da Silva, Acoustic detection of the magnetocaloric effect: Application to Gd and Gd5.09Ge2.03Si1.88, Phys. Rev. B 80, 134406 (2009).

 - V. S. R. de Sousa, E. J. R. Plaza, M. S. Reis, B. P. Alho, A. Magnus G. Carvalho, S. Gama, N. A. de Oliveira, P. J. von Ranke, Investigation on the magnetocaloric effect in DyNi2, DyAl2 and Tb1-nGdnAl2 (n = 0, 0.4, 0.6) compounds, J. Magn. Magn. Mat. 321, 3462 (2009).

 - P. J. von Ranke, B. P. Alho, E. J. R. Plaza, A. Magnus G. Carvalho, V. S. R. de Sousa, N. A. de Oliveira, Theoretical investigation on the magnetocaloric effect in garnets R3Fe5O12 where (R = Y and Dy), J. Appl. Phys. 106, 053914 (2009). 

 - A. Magnus G. Carvalho, F. Garcia, V. S. R. de Sousa, P. J. von Ranke, D. L. Rocco, G. D. Loula, E. J. de Carvalho, A. A. Coelho, L. M. da Silva, F. C. G. Gandra, Magnetic coupling between Gd and Pr ions and magnetocaloric effect in Gd0.5Pr0.5Al2 compound, J. Magn. Magn. Mat. 321, 3014 (2009).

 - S. Gama, A. de Campos, A. A. Coelho, C. S. Alves, Y. Ren, F. Garcia, D. E. Brown, L. M. da Silva, A. Magnus G. Carvalho, F. C. G. Gandra, A. O. dos Santos, L. P. Cardoso, P. J. von Ranke, A General Approach to First Order Phase Transitions and the Anomalous Behavior of Coexisting Phases in the Magnetic Case, Adv. Funct. Mat. 19 (6), 942-949 (2009)

 - A. Magnus G. Carvalho, A. A. Coelho, S. Gama, F. C. G. Gandra, P. J. von Ranke, N. A. de Oliveira, Investigation of the first-order metamagnetic transitions and the colossal magnetocaloric effect using a Landau expansion applied to MnAs compound, Eur. Phys. J. B 68, 67-72 (2009)

 - A. Magnus G. Carvalho, A. A. Coelho, S. Gama, P. J. von Ranke, C. S. Alves, Isothermal variation of the entropy (∆ST) for the compound Gd5Ge4 under hydrostatic pressure, J. Appl. Phys. 104, 063915 (2008).

 - P. J. von Ranke, N. A. de Oliveira, V. S. R. de Sousa, A. Magnus G. Carvalho, S. Gama, M. S. Reis, Theoretical investigation on the anisotropic magnetocaloric effect: Application to DyAl2, J. Magn. Magn. Mat. (2008). 

 - P. V. Trevizoli, C. S. Alves, M. A. B. Mendes, A. Magnus G. Carvalho, S. Gama, Powder metallurgy influences on the magnetic properties of Gd5.09Ge2.03Si1.88 alloy, J. Magn. Magn. Mat. 320, 1582 (2008).

 - P. J. von Ranke, N. A. de Oliveira, D. C. Garcia, V. S. R. de Souza, V. A. de Souza, A. Magnus G. Carvalho, S. Gama, M. S. Reis, Magnetocaloric effect due to spin reorientation in the crystalline electrical field: Theory applied to DyAl2, Phys. Rev. B 75, 184420 (2007).

 - D. L. Rocco, A. de Campos, A. Magnus G. Carvalho, L. Caron, A. A. Coelho, S. Gama, F. C. G. Gandra, A. O. dos Santos, L. P. Cardoso, P. J. von Ranke, N. A. de Oliveira, Ambient pressure colossal magnetocaloric effect in Mn1-xCuxAs compounds, Appl. Phys. Lett. 90, 242507 (2007).

 - P. J. von Ranke, N. A. de Oliveira, V. S. R. de Sousa, D. C. Garcia, Isaías G. de Oliveira, A. Magnus G. Carvalho, S. Gama, The influence of the spin reorientation process on the magnetocaloric effect: Application to PrAl2, J. Magn. Magn. Mat. 313, 176-181 (2007).

 - A. de Campos, D. L. Rocco, A. Magnus G. Carvalho, L. Caron, A. A. Coelho, S. Gama, L. M. da Silva, F. C. G. Gandra, A. O. dos Santos, L. P. Cardoso, P. J. von Ranke, N. A. de Oliveira, Ambient pressure colossal magnetocaloric effect tuned by composition in Mn1-xFexAs, Nature Materials 5, 802 (2006). 

 - P. J. von Ranke, N. A. de Oliveira, C. Mello, D. C. Garcia, V. A. de Souza, A. Magnus G. Carvalho, Influence of spin reorientation on magnetocaloric effect in NdAl2: A microscopic model, Phys. Rev B 74, 054425 (2006).

 - M. J. M. Pires, A. M. Mansanares, E. C. da Silva, A. Magnus G. Carvalho, S. Gama, A. A. Coelho, Electron spin resonance g shift in Gd5Si4, Gd5Ge4 and Gd5.09Ge2.03Si1.88, Phys. Rev. B 73, 144404 (2006).

 - P. J. von Ranke, S. Gama, A. A. Coelho, A. de Campos, A. Magnus G. Carvalho, F. C. G. Gandra, N. A. de Oliveira, Theoretical description of the colossal entropic magnetocaloric effect: Application to MnAs, Phys. Rev. B 73, 014415 (2006).

 - A. Magnus G. Carvalho, J. C. P. Campoy, A. A. Coelho, E. J. R. Plaza, S. Gama, P. J. von Ranke, Experimental and theoretical analyses of PrAl2 and NdAl2 composite for use as na active magnetic regenerator, J. Appl. Phys. 97, 083905 (2005).

 - M. J. M. Pires, A. Magnus G. Carvalho, S. Gama, E. C. da Silva, A. A. Coelho, A. M. Mansanares, Electron spin resonance and magnetic characterization of the Gd5.09Ge2.03Si1.88, Phys. Rev. B 72 (22), 224435 (2005).

 - P. J. von Ranke, N. A. de Oliveira, C. Mello, A. Magnus G. Carvalho, S. Gama, Analytical model to understand the colossal magnetocaloric effect, Phys. Rev. B 71, 054410 (2005).

 - A. Magnus G. Carvalho, C. S. Alves, A. de Campos, A. A. Coelho, S. Gama, F. C. G. Gandra, P. J. von Ranke, N. A. de Oliveira, The magnetic and magnetocaloric properties of Gd5Ge2Si2 compound under hydrostatic pressure, J. Appl. Phys. 97, 10M320 (2005).

 - S. Gama, A. A. Coelho, A. de Campos, A. Magnus G. Carvalho, F. C. G. Gandra, P. J. von Ranke, N. A. de Oliveira, Pressure-Induced Colossal Magnetocaloric Effect in MnAs, Phys. Rev. Lett. 93, 237202 (2004).

 - P. J. von Ranke, M. A. Mota, D. F. Grangeia, A. Magnus G. Carvalho, F. C. G. Gandra, A. A. Coelho, A. Caldas, N. A. de Oliveira, S. Gama, Magnetocaloric effect in the RNi5 (R = Pr, Nd, Gd, Tb, Dy, Ho, Er) series, Phys. Rev. B 70, 134428 (2004).




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