João Cunha de Sequeira Amaral

Assistant Researcher

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Department

  • 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

Hugo Guilherme Trigo

MSc Student

Leonardo José Oliveira Amaral

PhD Student

Rodrigo Kiefe Soares de Oliveira

Research Fellowship

Projects

Publications

On the nature of the (de)coupling of the magnetostructural transition in Er5Si4

Costa, RM; Belo, JH; Barbosa, MB; Algarabel, PA; Magen, C; Morellon, L; Ibarra, MR; Goncalves, JN; Fortunato, NM; Amaral, JS; Araujo, JP; Pereira, AM
2017, PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS, 254, 10.

Assessing Segregation Effects on Multiferroic Properties of Antiferromagnetic - Weak Ferromagnetic Coupled Sy stems by Analytical HRTEM

M. Vieira, A. Baghizadeh, J. S. Amaral, J. N. Gonalves, B. A. Almeida, M-G. Willinger, V. S. Amaral
2016, Microscopy and Microanalysis, 22, S4, 58-59.

Hidden value in low-cost inorganic pigments as potentially valuable magnetic materials

Novais, RM; Seabra, MP; Amaral, JS; Pullar, RC
2016, CERAMICS INTERNATIONAL, 42, 8, 9605-9612.

Smallest Bimetallic CoPt3 Superparamagnetic Nanoparticles

Karmaoui, M; Amaral, JS; Lajaunie, L; Puliyalil, H; Tobaldi, DM; Pullar, RC; Labrincha, JA; Arenal, R; Cvelbar, U
2016, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 7, 20, 4039-4046.

A combined thermodynamics and first principles study of the electronic, lattice and magnetic contributions to the magnetocaloric effect in La0.75Ca0.25MnO3

Korotana, RK; Mallia, G; Fortunato, NM; Amaral, JS; Gercsi, Z; Harrison, NM
2016, JOURNAL OF PHYSICS D-APPLIED PHYSICS, 49, 28.

High thermoelectric performance in Bi2-xPbxBa2Co2Oy promoted by directional growth and annealing

Madre, MA; Costa, FM; Ferreira, NM; Costa, SIR; Rasekh, S; Torres, MA; Diez, JC; Amaral, VS; Amaral, JS; Sotelo, A
2016, JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 36, 1, 67-74.

Magnetoelectric effect probe through ppm Fe doping in BaTiO3

Figueiras, FG; Amorim, CO; Amaral, J; Moreira, JA; Tavares, PB; Alves, E; Amaral, VS
2016, JOURNAL OF ALLOYS AND COMPOUNDS, 661, 495-500.

Modeling the magnetic properties and magnetocaloric effect of La0.7Sr0.3Mn0.9Ti0.1O3

Yahyaoui, S; Khalfaoui, M; Kallel, S; Kallel, N; Amaral, JS; Ben Lamine, A
2016, JOURNAL OF ALLOYS AND COMPOUNDS, 685, 633-638.

Nano-Localized Thermal Analysis and Mapping of Surface and Sub-Surface Thermal Properties Using Scanning Thermal Microscopy (SThM)

Pereira, MJ; Amaral, JS; Silva, NJO; Amaral, VS
2016, MICROSCOPY AND MICROANALYSIS, 22, 6, 1270-1280.

Structural, magnetic, magneto-transport properties and Bean-Rodbell model simulation of disorder effects in Cr3+ substituted La0.67Ba0.33MnO3 nanocrystalline synthesized by modified Pechini method

Oumezzine, M; Amaral, JS; Mompean, FJ; Hernandez, MG; Oumezzine, M
2016, RSC ADVANCES, 6, 38, 32193-32201.

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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