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Research Areas

by Francisco Silva last modified Feb 20, 2012 08:07 PM



IFIMUP has a long tradition and is internationally recognized for its fundamental research on the physics of advanced materials with significant scientific and technological impact, through the detailed, accurate and systematic characterization of a wide range of physical properties over extended ranges of temperature, magnetic and electric fields. The research activities cover the Physics of Magnetic Materials, Magnetoelectric Dielectrics and related Materials, Colossal magnetoresistance compounds and Oxide Conductors. In the last decade nanotechnologies have been introduced and extended research has been done in the areas of magnetic thin films, nanogranular and nanostructured magnetic films, namely multilayers, spin valves and magnetic tunnel junctions. In parallel, fundamental research is being performed in layered/nanostratified materials having giant magnetocaloric and magnetostrictive effects.

There are three main reasearch 'lines' @ IFIMUP-IN:

Multifunctional Magnetic Materials and Nanostructures

 read-write headThe main scientific achievements involve the highlight of the relative importance of ballistic/diffusive spin dependent transport in Magnetic Tunnel Junctions (published in Applied Physics Letters), the discovery of a Griffhits-like phase in rare earth based magnetocaloric Tb5Si2Ge2 compounds and thistances from 50 nm to 200 nm are now routinely achieved (with thickness from ~500 nm upwards, controlled by the anodization time). The application of these templates in the fabrication of NiFe and Ni magnetic nanowires (NW) directly electrodeposited inside the pores was accomplished. Another application was on the fabrication of silica and manganite nanotubes inside the Al2O3 membrane nanopores by a sol-gel method. Work regarding the bio-functionalization of both inside and outside surfaces of the nanotubes is underway.

Polarisable Materiais and Magnetoelectric Nanostructures


DielectricsResearch activity in the “Polarisable Materials and Magneto-Electric Nanostructures” (PM&MEN) group of IFIMUP-IN in the period 2003-2007 was focused on a diversified study of materials with interesting magnetic, dielectric properties that made them excellent candidates for the processing and development of devices for emerging technologies. Studying those materials has given rise to further new, challenging fundamental questions, whose answers have turned out to be important in gaining better knowledge of the actual physical mechanisms, and in improving their properties with regard to their technological applications. The following topics have been addressed: competitive interactions, Proton-glass state, relaxation processes, relaxors, non-linear rotation quantum dynamics, magnetoelectric effect and multiferroicity, spin-phonon (pseudospin) coupling, ordering in crystalline soft matter, the role of spin fluctuations and hybridisation effects on the electrical properties of R-T metallics.

Ultrafast lasers and Magnetodynamics Spectroscopies


HollowThe scientific objectives of the group in the report’s period were: generation of laser pulses in novel laser cavities, temporal pulse shaping and processing, generation of supercontinuum, solitonic and non-solitonic radiation, pulse compression, photonic crystal fibers, nonlinear optical interaction and cascaded four-wave mixing, study of low dimensional magnetic structures (including thin-films, magnetic multilayers, magnetic nanoparticles and nanopatterned materials), development of alternative high frequency magnetodynamic techniques. The activities were experimental, theoretical and numerical.


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