João Cunha de Sequeira Amaral

Assistant Researcher

Contact

Department

  • Physics
  • 13.2.2.2

Research

Links

Latest News

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

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

We use cookies for marketing activities and to offer you a better experience. By clicking “Accept Cookies” you agree with our cookie policy. Read about how we use cookies by clicking "Privacy and Cookie Policy".


Privacy and Cookie Policy

Personal data

CICECO-Aveiro Institute of Materials respects your privacy, ensuring confidentiality of personal data you share with the institution through this way, not collecting any personal information about you without your consent, under the terms required by General Data Protection Regulations (RGPD).

The data collected in forms are intended exclusively for processing user requests and will not be used for any other purpose, always safeguarding their confidentiality, under the terms of the protection conferred by the aforementioned regulation.

The collection and processing of data is the responsibility of CICECO and its storage is properly protected, only authorized CICECO employees can access the information within the scope of their functions, always being clear in the respective collection forms the purposes for which they are intended. The remaining issues to be considered in this matter will be handled by the University of Aveiro in accordance with the regime established by the GDPR.

Cookies policy

Cookies are small files with alphanumeric information that are stored on your computer's hard drive by your browser and are intended to improve the user experience and enhance website navigation.

Collection and use of technical information

The cookies used on CICECO are anonymous, and no information about our users that allows their personal identification is stored in them.

The technical information recorded consists of:

  • iP (Internet Protocol) address of the visitor;
  • the type of internet browser used by the website visitor and the respective operating system used;
  • the date and time of the consultation;
  • the pages visited on the site and the documents downloaded
  • The technical information collected is used for statistical purposes only.

Cookies used

Session cookies

These cookies are used to record user preferences, such as the language in which websites are displayed or to maintain authenticated user sessions, and are automatically deleted when the browser is closed.

Persistent cookies

These cookies store information that is needed between sessions. For example, a persistent cookie is set to record that you have been made aware of the cookie policy so that the message regarding this policy is not shown again the next time you visit the website. This cookie remains on the computer until it reaches its expiry date or is deleted by the user.

Data protection

The present privacy policy covers the Information System of the University of Aveiro (SIUA), governed by the General Data Protection Regulations (RGPD) Regulation (EU) No. 2016/679, of April 27th, 2016.

Data Protection Officer

The University of Aveiro has a Data Protection Officer (DPO), who ensures compliance of the processing of personal data with the legislation in force, and is available through the following email address epd@ua.pt.

Close