Banca de DEFESA: ARTHUR LANNE RICARDO DE SOUZA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ARTHUR LANNE RICARDO DE SOUZA
DATE: 17/12/2019
TIME: 09:30
LOCAL: Auditório do DFTE
TITLE:

Integration of the tape casting and magnetron sputtering techniques for the development of moldable multifunctional systems

KEY WORDS:

Flexible ceramics sheet, tape casting, thin films and magnetron sputtering

PAGES: 85
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUMMARY:

The increased demand for low-power and high-performance electronic systems has been driving the discovery of new materials and the study of their physical and chemical properties. In this sense, the integration of different techniques allows us to develop multifunctional materials with specific properties and characteristics for certain technological applications. In this scenario, this work presents a proposal for the production of hybrid materials through the integration between tape casting and magnetron sputtering techniques. To this end, the magnetron sputtering technique was used to grow trilayered thin films nanostructures of Ni₈₁Fe₁₉/Cr/Ni₈₁Fe₁₉, using as substrates Al₂O₃ and ZrO₂ ceramic flexible sheet produced by the tape casting technique. As a comparison standard, similar films were grown onto amorphous rigid substrate (glass), which has been widely studied in the literature. The slurries, suspensions of ceramic materials, presented the pseudoplastic behavior, which is recommended for the tape casting technique. The films were produced with a fixed total thickness of 300 nm, but varying the thickness of the Ni₈₁Fe₁₉ layers between 75 and 142.5 nm and the Cr layer thickness between 15 and 150 nm. The structural characterization revealed that the change of the used substrate did not modify the structural properties of Ni₈₁Fe₁₉ films. The magnetic measurements reveal that films produced onto flexible sheet show an evolution of the contribution of out-of-plane anisotropy with the increase of Ni₈₁Fe₁₉ layer thickness, as well as the dependence of magnetic properties with the Ni₈₁Fe₁₉ layer thickness, results that mirroring the magnetic properties found in Ni₈₁Fe₁₉ thin films on the glass in the literature. Based on these results, we were able to keep the magnetic properties of the Ni₈₁Fe₁₉ alloy, even when the flexible sheet of Al₂O₃ and ZrO₂ ceramic tapes were employed. Thus we conclude that the flexible sheets are excellent candidates for moldable device applications as ceramic-magnetic coating.

BANKING MEMBERS:
Externo à Instituição - Antonio Carlos Silva da Costa
Interno - 2391788 - BRUNO RICARDO DE CARVALHO
Presidente - 1474380 - MARCIO ASSOLIN CORREA