João Cunha de Sequeira Amaral

Assistant Researcher

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  • Physics
  • 13.2.2.2

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Short CV

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 - Aveiro Institute of Materials and Physics Dept. at the University of Aveiro.

He was the main supervisor of two PhD. students (finished 2020 and 2021), and is currently the main supervisor of two others, and the co-supervisor of another. João has coordinated one FCT exploratory project, and is now the PI of one FCT exploratory project, an advanced computational research project, an FCT-DAAD bi-lateral project with partner TU Darmstadt Germany, and is one of the seven research line coordinators of the 19M€ Bosch Thermotechnology - University of Aveiro Smart Green Homes Project.

He has presented over 25 oral presentations (4 invited) in international conferences. João was an invited researcher at the EXSS group at Imperial College London, from 2013-2015. João has published over 85 peer-reviewed papers, with over 1200 citations (~1100 no self-citations), with an h-factor of 16. João was the invited Editor of Special Issues in AIP Advances (American Institue of Physics), Frontiers in Energy Research (Frontiers) and Journal of Magnetism and Magnetic Materials (Elsevier).

Present projects

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).

Selected Publications

"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].

Ongoing Supervisions

André Filipe Castanheira Horta

Research Fellowship

Leonardo José Oliveira Amaral

PhD Student

Nuno Brízida

Research Fellowship

Rodrigo Kiefe Soares de Oliveira

Research Fellowship

Projects

Publications

Magnetic nanosorbents with siliceous hybrid shells of alginic acid and carrageenan for removal of ciprofloxacin

Soares, SF; Rocha, MJ; Ferro, M; Amorim, CO; Amaral, JS; Trindade, T; Daniel-da-Silva, AL
2019, INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES, 139, 827-841.
ISBN: 1879-0003

Octylamine as a novel fuel for the preparation of magnetic iron oxide particles by an aqueous auto-ignition method

Ben-Arfa, BAE; Mohseni, F; Salvado, IMM; Ferreira, JMF; Amaral, JS; Pullar, RC
2019, JOURNAL OF ALLOYS AND COMPOUNDS, 805, 545-550.
ISBN: 1873-4669

Experimental and theoretical evidences that atomic disorder suppresses half-metallicity of Heusler compounds

Caraballo-Vivas, RJ; Tedesco, JCG; Checca, NR; Fortunato, NM; Goncalves, JN; Sanchez, DR; Carvalho, AMG; Amaral, JS; Reis, MS
2019, INTERMETALLICS, 111.
ISBN: 1879-0216

Enhancement of maximum energy product in exchange-coupled BaFe12O19/Fe3O4 core-shell-like nanocomposites

Mohseni, F; Pullar, RC; Vieira, JM; Amaral, JS
2019, JOURNAL OF ALLOYS AND COMPOUNDS, 806, 120-126.
ISBN: 1873-4669

Link of Weak Ferromagnetism to Emergence of Topological Vortices in Bulk Ceramics of h-LuMnxO3 Manganite

Baghizadeh, A; Vaghefi, PM; Alikin, DO; Amaral, JS; Amaral, VS; Vieira, JM
2019, JOURNAL OF PHYSICAL CHEMISTRY C, 123, 10, 6158-6166.

Effect of surfactants on the optical and magnetic properties of cobalt-zinc ferrite Co0.5Zn0.5Fe2O4

El Foulani, AH; Aamouche, A; Mohseni, F; Amaral, JS; Tobaldi, DM; Pullar, RC
2019, JOURNAL OF ALLOYS AND COMPOUNDS, 774, 1250-1259.
ISBN: 1873-4669

Cooling by sweeping: A new operation method to achieve ferroic refrigeration without fluids or thermally switchable components

Silva, DJ; Amaral, JS; Amaral, VS
2019, INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, 101, 98-105.
ISBN: 1879-2081

On the Optimization of Magneto-Volume Coupling for Practical Applied Field Magnetic Refrigeration

Davarpanah, A; Belo, JH; Amaral, VS; Amaral, JS
2019, PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 256, 3.
ISBN: 1521-3951

Enhancing the temperature span of thermal switch-based solid state magnetic refrigerators with field sweeping

Silva, DJ; Ventura, J; Amaral, JS; Amaral, VS
2019, INTERNATIONAL JOURNAL OF ENERGY RESEARCH, 43, 2, 742-748.
ISBN: 1099-114X

Temperature dependent thermal conductivity of magnetocaloric materials: Impact assessment on the performance of active magnetic regenerative refrigerators

Silva, DJ; Davarpanah, A; Amaral, JS; Amaral, VS
2019, INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID, 106, 181-187.
ISBN: 1879-2081

Synthesis and Characterisation of Magnetoelectric Ceramic Composites based on M-type Strontium and Barium Hexagonal Ferrites and Barium Titanate

In Jotania, RB; Mahmood, SH (Eds.), MAGNETIC OXIDES AND COMPOSITES
Medeiros, MSA; Amaral, JS; Pullar, RC
2018, 1-48, MILLERSVILLE, PA 17551 USA, MATERIALS RESEARCH FORUM LLC.
ISBN: 00433396700001

The Mean-Field Theory in the Study of Ferromagnets and the Magnetocaloric Effect

In Juan Carlos Moreno-Piraján (Eds.), Thermodynamics - Systems in Equilibrium and Non-Equilibrium
Amaral J S , Das S ,Amaral V S
2011, Rijeka, InTech.
ISBN: 978-953-307-283-8

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