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

PhD Student

Gaspar Mamede Ribeiro Soares

Research Fellowship

Leonardo José Oliveira Amaral

PhD Student

Rodrigo Kiefe Soares de Oliveira

PhD Student

Projects

Publications

On estimating the magnetocaloric effect from magnetization measurements

Amaral, JS; Amaral, VS
2010, JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 322, 9-12, 1552-1557.

Prediction of realistic entropy behavior from mixed state magnetization data for first order phase transition materials

Das, S; Amaral, JS; Amaral, VS
2010, JOURNAL OF APPLIED PHYSICS, 107, 9.

Handling mixed-state magnetization data for magnetocaloric studies-a solution to achieve realistic entropy behaviour

Das, S; Amaral, JS; Amaral, VS
2010, JOURNAL OF PHYSICS D-APPLIED PHYSICS, 43, 15.

The effect of magnetic irreversibility on estimating the magnetocaloric effect from magnetization measurements

Amaral, JS; Amaral, VS
2009, APPLIED PHYSICS LETTERS, 94, 4.

High refrigerant capacity of PrNi5-xCox magnetic compounds exploiting its spin reorientation and magnetic transition over a wide temperature zone

Rocco, DL; Amaral, JS; Leitao, JV; Amaral, VS; Reis, MS; Das, S; Fernandes, RP; Araujo, JP; Pereira, AM; Tavares, PB; Martins, NV; Coelho, AA
2009, JOURNAL OF PHYSICS D-APPLIED PHYSICS, 42, 5.

Percolation processes and spin-reorientation of PrNi5-xCox

Rocco, DL; Amaral, JS; Leitao, JV; Amaral, VS; Reis, MS; Fernandes, RP; Pereira, AM; Araujo, JP; Martins, NV; Tavares, PB; Coelho, AA
2009, PHYSICAL REVIEW B, 79, 1.

Superferromagnetism in mechanically alloyed fcc Fe23Cu77 with bimodal cluster size distribution

Silva, NJO; Amaral, JS; Amaral, VS; Costa, BFO; Le Caer, G
2009, JOURNAL OF PHYSICS-CONDENSED MATTER, 21, 4.

The effect of chemical distribution on the magnetocaloric effect: A case study in second-order phase transition manganites

Amaral, JS; Tavares, PB; Reis, MS; Araujo, JP; Mendonca, TM; Amaral, VS; Vieira, JM
2008, JOURNAL OF NON-CRYSTALLINE SOLIDS, 354, 47-51, 5301-5303.

Influence of the Magnetic Anisotropy on the Magnetic Entropy Change of Ni2Mn(Ga, Bi) Memory Shape Alloy

Leitao, JCV; Rocco, DL; Amaral, JS; Reis, MD; Amaral, VBS; Fernandes, RP; Martins, NV; Tavares, PB
2008, IEEE TRANSACTIONS ON MAGNETICS, 44, 11, 3036-3039.

Phase Separation of La0.70-xErxSr0.30MnO3 and its Effect on Magnetic and Magnetocaloric Properties

Amaral, JS; Reis, MS; Araujo, JP; Mendonaca, TM; Tavares, PB; Amaral, VS; Vieira, JM
2008, ADVANCED MATERIALS FORUM IV, 587-588, 338-+.

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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