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João Cunha de Sequeira Amaral |
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Research Assistant
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extension:
23144 | |
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e-mail:
jamaral@ua.pt |
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departament:
Physics | |
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office:
13.3.31.3 |
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research line:
L4 - Computing and Modelling
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research group:
G2 - Multifunctional Ferroic Ceramics and Nanostructures
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direct url:
http://www.ciceco.ua.pt/jamaral
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João Amaral obtained his PhD in Physics at the University of Aveiro in Dcember 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 a post-doctoral researcher 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 34 papers in ISI-indexed peer-reviewed international scientific journals and presented 19 oral presentations in international conferences and meetings (2 invited). He is currently supervising 3 PhD students (1 co-supervision) 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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Korotana, RK; Mallia, G; Fortunato, NM; Amaral, JS; Gercsi, Z; Harrison, NM (2016) A combined thermodynamics and first principles study of the electronic, lattice and magnetic contributions to the magnetocaloric effect in La0.75Ca0.25MnO3.
JOURNAL OF PHYSICS D-APPLIED PHYSICS, 49, 28,
DOI: 10.1088/0022-3727/49/28/285001
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Novais, RM; Seabra, MP; Amaral, JS; Pullar, RC (2016) Hidden value in low-cost inorganic pigments as potentially valuable magnetic materials.
CERAMICS INTERNATIONAL, 42, 8, 9605-9612.
DOI: 10.1016/j.ceramint.2016.03.045
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Madre, MA; Costa, FM; Ferreira, NM; Costa, SIR; Rasekh, S; Torres, MA; Diez, JC; Amaral, VS; Amaral, JS; Sotelo, A (2016) High thermoelectric performance in Bi2-xPbxBa2Co2Oy promoted by directional growth and annealing.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 36, 1, 67-74.
DOI: 10.1016/j.jeurceramsoc.2015.09.034
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Figueiras, FG; Amorim, CO; Amaral, J; Moreira, JA; Tavares, PB; Alves, E; Amaral, VS (2016) Magnetoelectric effect probe through ppm Fe doping in BaTiO3.
JOURNAL OF ALLOYS AND COMPOUNDS, 661, 495-500.
DOI: 10.1016/j.jallcom.2015.11.199
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Yahyaoui, S; Khalfaoui, M; Kallel, S; Kallel, N; Amaral, JS; Ben Lamine, A (2016) Modeling the magnetic properties and magnetocaloric effect of La0.7Sr0.3Mn0.9Ti0.1O3.
JOURNAL OF ALLOYS AND COMPOUNDS, 685, 633-638.
DOI: 10.1016/j.jallcom.2016.05.318
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Pereira, MJ; Amaral, JS; Silva, NJO; Amaral, VS (2016) Nano-Localized Thermal Analysis and Mapping of Surface and Sub-Surface Thermal Properties Using Scanning Thermal Microscopy (SThM).
MICROSCOPY AND MICROANALYSIS, 22, 6, 1270-1280.
DOI: 10.1017/S1431927616011867
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Karmaoui, M; Amaral, JS; Lajaunie, L; Puliyalil, H; Tobaldi, DM; Pullar, RC; Labrincha, JA; Arenal, R; Cvelbar, U (2016) Smallest Bimetallic CoPt3 Superparamagnetic Nanoparticles.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, 7, 20, 4039-4046.
DOI: 10.1021/acs.jpclett.6b01768
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Oumezzine, M; Amaral, JS; Mompean, FJ; Hernandez, MG; Oumezzine, M (2016) 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.
RSC ADVANCES, 6, 38, 32193-32201.
DOI: 10.1039/c6ra03328h
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Sotelo, A; Costa, FM; Ferreira, NM; Kovalevsky, A; Ferro, MC; Amaral, VS; Amaral, JS; Rasekh, S; Torres, MA; Madre, MA; Diez, JC (2016) Tailoring Ca3Co4O9 microstructure and performances using a transient liquid phase sintering additive.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 36, 4, 1025-1032.
DOI: 10.1016/j.jeurceramsoc.2015.11.024
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Pereira M.J., Amaral J.S., Silva N.J.O., Amaral V.S. (2016) Scanning thermal microscopy: Nano-localized thermal analysis and mapping of surface and subsurface thermal properties.
Microscopy and Microanalysis, 22, 2-3.
DOI: 10.1017/S1431927616000209
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Baghizadeh, A; Vieira, JM; Amaral, JS; Graca, MP; Soares, MR; Mota, DA; Amaral, VS (2015) Crystal structure, magnetic and dielectric behavior of h-LuMnxO3 +/-delta ceramics (0.95 <= x <= 1.04).
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 395, 303-311.
DOI: 10.1016/j.jmmm.2015.07.082
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Amorim, CO; Figueiras, F; Amaral, JS; Vaghefi, PM; Tavares, PB; Correia, MR; Baghizadeh, A; Alves, E; Rocha, J; Amaral, VS (2015) Peculiar Magnetoelectric Coupling in BaTiO3:Fe-113 ppm Nanoscopic Segregations.
ACS APPLIED MATERIALS & INTERFACES, 7, 44, 24741-24747.
DOI: 10.1021/acsami.5b07462
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Yahyaoui, S; Khalfaoui, M; Kallel, S; Kallel, N; Amaral, JS; Ben Lamine, A (2015) Modeling the magnetic isotherms of (La0.56Ce0.14)Sr0.30MnO3 by a mean-field scaling method and estimation of magnetic entropy change.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 393, 105-109.
DOI: 10.1016/j.jmmm.2015.05.044
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Pullar, RC; Marques, P; Amaral, J; Labrincha, JA (2015) Magnetic wood-based biomorphic Sr3Co2Fe24O41 Z-type hexaferrite ecoceramics made from cork templates.
MATERIALS & DESIGN, 82, 297-303.
DOI: 10.1016/j.matdes.2015.03.047
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Goncalves, JN; Amaral, JS; Amaral, VS (2014) Magnetovolume Effects in Heusler Compounds via First-Principles Calculations.
IEEE TRANSACTIONS ON MAGNETICS, 50, 11,
DOI: 10.1109/TMAG.2014.2326892
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Turcaud, JA; Morrison, K; Pereira, AM; Amaral, JS; Berenov, A; Daoud-Aladine, A; Sandeman, KG; Cohen, LF (2014) In Rowe, A (Eds.), MAGNETOCALORIC EFFECTS IN MANGANITES REVISITED.
6TH IIR/IIF INTERNATIONAL CONFERENCE ON MAGNETIC REFRIGERATION (THERMAG VI), 15-16.
ISBN: 978-2-362150-07-4
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Turcaud, JA; Pereira, AM; Sandeman, KG; Amaral, JS; Morrison, K; Berenov, A; Daoud-Aladine, A; Cohen, LF (2014) Spontaneous magnetization above T-C in polycrystalline La0.7Ca0.3MnO3 and La0.7Ba0.3MnO3.
PHYSICAL REVIEW B, 90, 2,
DOI: 10.1103/PhysRevB.90.024410
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Amaral, JS; Amaral, VS (2014) Disorder effects in giant magnetocaloric materials.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 211, 5, 971-974.
DOI: 10.1002/pssa.201300749
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Amaral, JS; Goncalves, JN; Amaral, VS (2014) Thermodynamics of the 2-D Ising Model From a Random Path Sampling Method.
IEEE TRANSACTIONS ON MAGNETICS, 50, 11,
DOI: 10.1109/TMAG.2014.2326713
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Pullar, RC; Hajjaji, W; Amaral, JS; Seabra, MP; Labrincha, JA (2014) Magnetic Properties of Ferrite Ceramics Made from Wastes.
WASTE AND BIOMASS VALORIZATION, 5, 1, 133-138.
DOI: 10.1007/s12649-013-9207-1
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Amaral J S , Das S ,Amaral V S (2011) 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.
Rijeka: InTech. 
