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João Amaral obtained his PhD in Physics at the University of Aveiro in December 2009, and has dedicated most of his scientific career to the study of magnetism and magnetic materials. His main focus of research during MSc. and PhD. was on magnetocaloric materials for magnetic refrigeration applications. Recent research interests include rare-earth free permanent magnets, by optimizing their composition and production through nanostructuring techniques, in a combined effort with the use of theoretical tools such as Density Functional Theory and Ising/Heisenberg models.
He is currently an Assistant Researcher (Investigador FCT 2015 programme) at CICECO and Physics Dept. at the University of Aveiro, and IFIMUP-IN (Institute of Nanotechnology) Porto, as well as an invited researcher at the EXSS group at Imperial College London. He has published 70 papers in ISI-indexed peer-reviewed international scientific journals and presented 25 oral presentations in international conferences and meetings (3 invited). He is currently the main supervisor of 3 PhD students and a MsC. student, in Physics and Physics Engineering courses at Universidade de Aveiro.
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Principal Investigator of the FCT Exploratory Research Project "Exploring nano-fabrication methods of high coercivity rare-earth free Si-Alnico permanent magnets" (EXPL/CTM-NAN/1614/2013) [more info at the FCT web page]
Task leader of the FCT SR&TD Project of consolidation of research skills and resources "Facing the challenges of characterizing novel thermal materials and processes (Heat@UA)" (RECI/CTM-CER/0336/2012).
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"Magnetovolume Effects in Heusler Compounds via First-Principles Calculations", J. N. Gonçalves, J. S. Amaral and V. S. Amaral, IEEE Trans. Magn. 50 1301104 (2014) [DOI].
"Thermodynamics of the 2D Ising model from a random path sampling method", J. S. Amaral, J. N. Gonçalves and V. S. Amaral, IEEE Trans. Magn. 50 1002204 (2014) [DOI].
"Disorder effects in giant magnetocaloric materials", J. S. Amaral and V. S. Amaral; Phys. Stat. Sol. A 211 971 (2014) [DOI].
"Strain induced enhanced ferromagnetic behavior in inhomogeneous low doped La0.95Sr0.05MnO3+delta", S. Das, J. S. Amaral, et al.; Appl. Phys. Lett. 102 112408 (2013) [DOI].
"On the Curie temperature dependency of the Magnetocaloric effect", J. H. Belo, J. S. Amaral, et al.; Appl. Phys. Lett. 100 242407 (2012) [DOI].
"Handling mixed-state magnetization data for magnetocaloric studies - a solution to achieve realistic entropy behaviour", S. Das, J. S. Amaral, V. S. Amaral; J. Phys. D Appl. Phys. 43 152002 (2010) [DOI].
"On estimating the magnetocaloric effect from magnetization measurements", J. S. Amaral, V. S. Amaral; J. Magn. Magn. Mat. 322 1552 (2009) [DOI].
"The effect of magnetic irreversibility on estimating the magnetocaloric effect from magnetization measurements", J. S. Amaral, V. S. Amaral; Appl. Phys. Lett. 94 042506 (2009) [DOI].
"The effect of chemical distribution on the magnetocaloric effect: A case study in second-order phase transition manganites", J. S. Amaral, P. B. Tavares, et al., Journal of Non-Crystalline Solids 354 (47-51), 5301-5303 (2008) [DOI].
"A mean-field scaling method for first- and second-order phase transition ferromagnets and its application in magnetocaloric studies", J. S. Amaral, N. J. O. Silva, V. S. Amaral; Appl. Phys. Lett. 91, 172503 (2007) [DOI].
"Magnetocaloric effect in Er and Eu-substituted ferromagnetic La-Sr Manganites", J. S. Amaral, M. S. Reis, et al.; J. Magn. Magn. Mat. 290 686 (2005) [DOI].
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Development of polyurethane foam incorporating phase change material for thermal energy storageAmaral, C; Pinto, SC; Silva, T; Mohseni, F; Amaral, JS; Amaral, VS; Marques, PAAP; Barros-Timmons, A; Vicente, R
2020, JOURNAL OF ENERGY STORAGE, 28,
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Magnetic Driven Nanocarriers for pH-Responsive Doxorubicin Release in Cancer TherapyNogueira, J; Soares, SF; Amorim, CO; Amaral, JS; Silva, C; Martel, F; Trindade, T; Daniel-da-Silva, AL
2020, MOLECULES, 25, 2,
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Synthesis of red mud derived M-type barium hexaferrites with tuneable coercivityCarvalheiras, J; Novais, RM; Mohseni, F; Amaral, JS; Seabra, MP; Labrincha, JA; Pullar, RC
2020, CERAMICS INTERNATIONAL, 46, 5, 5757-5764.
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Magnetic nanosorbents with siliceous hybrid shells of alginic acid and carrageenan for removal of ciprofloxacinSoares, SF; Rocha, MJ; Ferro, M; Amorim, CO; Amaral, JS; Trindade, T; Daniel-da-Silva, AL
2019, INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES, 139, 827-841.
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Octylamine as a novel fuel for the preparation of magnetic iron oxide particles by an aqueous auto-ignition methodBen-Arfa, BAE; Mohseni, F; Salvado, IMM; Ferreira, JMF; Amaral, JS; Pullar, RC
2019, JOURNAL OF ALLOYS AND COMPOUNDS, 805, 545-550.
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Experimental and theoretical evidences that atomic disorder suppresses half-metallicity of Heusler compoundsCaraballo-Vivas, RJ; Tedesco, JCG; Checca, NR; Fortunato, NM; Goncalves, JN; Sanchez, DR; Carvalho, AMG; Amaral, JS; Reis, MS
2019, INTERMETALLICS, 111,
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Enhancement of maximum energy product in exchange-coupled BaFe12O19/Fe3O4 core-shell-like nanocompositesMohseni, F; Pullar, RC; Vieira, JM; Amaral, JS
2019, JOURNAL OF ALLOYS AND COMPOUNDS, 806, 120-126.
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Link of Weak Ferromagnetism to Emergence of Topological Vortices in Bulk Ceramics of h-LuMnxO3 ManganiteBaghizadeh, A; Vaghefi, PM; Alikin, DO; Amaral, JS; Amaral, VS; Vieira, JM
2019, JOURNAL OF PHYSICAL CHEMISTRY C, 123, 10, 6158-6166.
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Effect of surfactants on the optical and magnetic properties of cobalt-zinc ferrite Co0.5Zn0.5Fe2O4El Foulani, AH; Aamouche, A; Mohseni, F; Amaral, JS; Tobaldi, DM; Pullar, RC
2019, JOURNAL OF ALLOYS AND COMPOUNDS, 774, 1250-1259.
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Cooling by sweeping: A new operation method to achieve ferroic refrigeration without fluids or thermally switchable componentsSilva, DJ; Amaral, JS; Amaral, VS
2019, INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, 101, 98-105.
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On the Optimization of Magneto-Volume Coupling for Practical Applied Field Magnetic RefrigerationDavarpanah, A; Belo, JH; Amaral, VS; Amaral, JS
2019, PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 256, 3,
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Enhancing the temperature span of thermal switch-based solid state magnetic refrigerators with field sweepingSilva, DJ; Ventura, J; Amaral, JS; Amaral, VS
2019, INTERNATIONAL JOURNAL OF ENERGY RESEARCH, 43, 2, 742-748.
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Temperature dependent thermal conductivity of magnetocaloric materials: Impact assessment on the performance of active magnetic regenerative refrigeratorsSilva, DJ; Davarpanah, A; Amaral, JS; Amaral, VS
2019, INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, 106, 181-187.
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Modeling and computing magnetocaloric systems using the Python framework heatrapySilva, DJ; Amaral, JS; Amaral, VS
2019, INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, 106, 278-282.
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Electric Field Induced Room Temperature Null to High Spin State Switching: A Computational PredictionAmorim, CO; Amaral, JS; Goncalves, JN; Amaral, VS
2019, ADVANCED THEORY AND SIMULATIONS, 2, 4,
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Synthesis and Characterisation of Magnetoelectric Ceramic Composites based on M-type Strontium and Barium Hexagonal Ferrites and Barium TitanateMedeiros, MSA; Amaral, JS; Pullar, RC
In Jotania, RB; Mahmood, SH (Eds.), MAGNETIC OXIDES AND COMPOSITES
2018, 1-48. MILLERSVILLE, PA 17551 USA: MATERIALS RESEARCH FORUM LLC.
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The Mean-Field Theory in the Study of Ferromagnets and the Magnetocaloric EffectAmaral J S , Das S ,Amaral V S
In Juan Carlos Moreno-Piraján (Eds.), Thermodynamics - Systems in Equilibrium and Non-Equilibrium
2011, Rijeka: InTech.
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