João Cunha de Sequeira Amaral

Assistant Researcher

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  • Physics
  • 13.2.2.2

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Short CV

João Amaral was awarded his PhD. in Physics in 2009 at the University of Aveiro (UA), and currently holds a permanent position as Assistant Researcher at the Associated Laboratory CICECO at UA. He has dedicated most of his scientific career to the to the study of magnetism and magnetic materials, with particular focus in energy applications. He is co-author of over 100 scopus-indexed peer-reviewed scientific publications, with over 2000 citations and an h-index of 24. He was the invited Editor of Special Issues in AIP Advances (American Institute of Physics), Frontiers in Energy Research (Frontiers) and Journal of Magnetism and Magnetic Materials (Elsevier).

He was the main supervisor of two PhD. students (finished 2020 and 2021), and is currently the main supervisor of three PhD. students (two with FCT funding) and the co-supervisor of another. He has coordinated competitive funded projects, including two FCT Exploratory Research Projects, an FCT-DAAD bi-lateral project with partner TU Darmstadt Germany, the local PI of an FCT IC&DT project, a national advanced computational research project, an EuroHPC computational project (850k CPU hours), was one of the seven research line coordinators of the 18M€ Bosch Thermotechnology - University of Aveiro Smart Green Homes Project and is the local PI of the recently approved EIC Pathfinder project MAGCCINE on magnetic refrigeration for vaccines.

He was an invited researcher at the EXSS group at Imperial College London from 2013-2015, collaborating with multiple national and international research groups throughout his career, while prioritizing the mobility and internationalization of his research team. He is currently the coordinator of CICECO Group 2: Photonic, Electronic and Magnetic Materials.

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

Gaspar Mamede Ribeiro Soares

MSc Student

Henrique Berganton de Souza

Research Fellowship

Leonardo José Oliveira Amaral

PhD Student

Rodrigo Kiefe Soares de Oliveira

PhD Student

Projects

Clean and efficient cooling in vaccine transportation using Rotating Magnetocaloric Effect (MAGCCINE )

Local CoordinatorEuropean Comission
Every year 1.5 million lives are lost worldwide due to insufficient access to vaccination while, paradoxically, over 50% of all produced vaccines are wasted, mostly due to ineffective temperature control during storage/transportation. The major challenges of the vaccine cold chain are the evermore strict limitations imposed on their aerial trans...

Demagnetizing-based magnetocaloric refrigeration (MAGCAL)

Local CoordinatorFundação para a Ciência e a Tecnologia
Magnetocaloric refrigeration Permanent magnets Modeling Machine learning

Development of SMART nanostructured layers for sensing corrosion in AQUAtic structures (SMARTAQUA)

PartnerFundação para a Ciência e a Tecnologia
Corrosion is a result of thermodynamically-driven processed which occur due to the interaction of active metal alloys with the surrounding environment, leading to the degradation of metallic structures. The problem is particularly relevant in maritime offshore structures due to aggressive conditions such as high salinity and humidity. Although t...

Exploratory Research Project: João Amaral (IF/01089/2015)

CoordinatorFundação para a Ciência e a Tecnologia

Exploring nano-fabrication methods of high coercivity rare-earth free Si-Alnico permanent magnets (EXPL/CTM-NAN/1614/2013)

CoordinatorFundação para a Ciência e a Tecnologia
Permanent Magnets Nano-fabrication Magnetic Coercivity Strategic resource sustainability

Publications

Near room-temperature thermomagnetic energy harvesting

Belo J.H.; Amaral J.S.; Ventura J.O.
2023, Europhysics News, 54, 20-23.

High yttrium retention in magnetite nanoparticles functionalized with hybrid silica-dextran shells

Horta A.C.; Amorim C.O.; Soares S.F.; Bañobre-López M.; Daniel-da-Silva A.L.; Trindade T.; Amaral J.S.
2023, Nano-Structures and Nano-Objects, 36.

Chemical Strategies for Dendritic Magneto-plasmonic Nanostructures Applied to Surface-Enhanced Raman Spectroscopy

Fernandes, T; Nogueira, HIS; Amorim, CO; Amaral, JS; Daniel-da-Silva, AL; Trindade, T
2022, CHEMISTRY-A EUROPEAN JOURNAL, 28, 61.

Cubic to hexagonal tuning in Fe2Mn(Si1-xGex) Heusler alloys

Pimentel, B; Andrade, VM; de Paula, VG; Pirota, KR; Beron, F; Cardoso, MA; Goncalves, JN; Amaral, JS; dos Santos, AM; Reis, MS
2022, JOURNAL OF ALLOYS AND COMPOUNDS, 893.

Direct Measurement of the Magnetocaloric Effect through Time-Dependent Magnetometry

Almeida, R; Amorim, C; Amaral, JS; Araujo, JP; Belo, JH
2022, PHYSICAL REVIEW APPLIED, 18, 2.

Thermal Response of Magnetic Refrigerants: Combined Effect of Temperature Dependent Specific Heat and Thermal Conductivity

Lopes, AP; Costa, VAF; Amaral, JS
2022, APPLIED SCIENCES-BASEL, 12, 13.

On the efficient removal, regeneration and reuse of quaternary chitosan magnetite nanosorbents for glyphosate herbicide in water

Soares, SF; Amorim, CO; Amaral, JS; Trindade, T; Daniel-da-Silva, AL
2021, JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING, 9, 3.
ISBN: 2213-3437

Synthesis and characterisation of lead free BaFe12O19 -(K0.5Na0.5)NbO3 magnetoelectric composites, and the comparison of various synthetic routes

Medeiros, MSA; Coondoo, I; Oliveira, FJS; Kholkin, AL; Amaral, JS; Pullar, RC
2021, JOURNAL OF ALLOYS AND COMPOUNDS, 883.
ISBN: 1873-4669

A geometry-independent moment correction method for the MPMS3 SQUID-based magnetometer

Amorim, CO; Mohseni, F; Dumas, RK; Amaral, VS; Amaral, JS
2021, MEASUREMENT SCIENCE AND TECHNOLOGY, 32, 10.
ISBN: 1361-6501

Enhanced strain-induced magnetoelectric coupling in polarization-free Fe/BaTiO3 heterostructures

Amorim, CO; Amaral, JS; Amaral, VS
2021, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 23, 30, 16053-16059.
ISBN: 1463-9084

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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