Andre Pereira

Liam Lewis was once a superhero known as Faceless. Wanting to end with all the collateral damage from his battles against supervillains he stopped being a superhero. Two years later, still unable to sleep as the screams and crying of people caught in-between his battles still haunt him. He begins seeing a therapist in the hopes of defeating his toughest opponent to date, his own mind.

Transport Phenomena in Micro- and Nanoscale Functional Materials and Devices offers a pragmatic view on transport phenomena for micro- and nanoscale materials and devices, both as a research tool and as a means to implant new functions in materials. Chapters emphasize transport properties (TP) as a research tool at the micro/nano level and give an experimental view on underlying techniques. The relevance of TP is highlighted through the interplay between a micro/nanocarrier’s characteristics and media characteristics: long/short-range order and disorder excitations, couplings, and in energy conversions. Later sections contain case studies on the role of transport properties in functional nanomaterials. This includes transport in thin films and nanostructures, from nanogranular films, to graphene and 2D semiconductors and spintronics, and from read heads, MRAMs and sensors, to nano-oscillators and energy conversion, from figures of merit, micro-coolers and micro-heaters, to spincaloritronics.

The Spin Seebeck Effect (SSE) was first reported in 2008 and consists in the generation of a spin current in a paramagnetic metal (PM), caused by an applied thermal gradient in a ferromagnet (FM). The injected spin current is converted into a transverse electric voltage by means of the Inverse Spin Hall Effect (ISHE), which is a result of a spin-orbit interaction of the electrons in the conductive layer. The SSE devices, due to their relatively simple structure, provide an easy scaling-capability, which attributes useful characteristics for thermoelectric and sensing applications to these devices. In this work, three different FM materials were prepared and characterized (YIG, La0.9Ca0.1MnO3 and NiO) and SSE devices were produced. An experimental set-up was designed and developed to measure the SSE output of these devices. Measurements were carried out at room temperature and up to 50 C and an SSE output of up to 0.25 V was obtained.

Rodrigo era um adolescente perfeitamente normal at descobrir que tinha um irm o feiticeiro. Ap s essa descoberta a vida de Rodrigo sofreu grandes mudan as. Mudou de casa, mudou de terra e at os costumes. Passou de um rapaz discreto e pacato a um rapaz propenso a estar no centro dos acontecimentos. Para se integrar mais rapidamente na sua nova realidade, decide participar num torneio da escola com o irm o Rafael, cujo um dos pr mios uma vaga numa miss o que tem como objetivo descobrir o paradeiro de Ivan, o mago negro mais temido da atualidade. No entanto o grau de dificuldade revela-se muito acima do previsto e as ambi es tornam-se num aut ntico pesadelo. Os confrontos posteriores, o peso das vidas que carrega nos ombros e a consequente press o impens vel s o apenas uns dos muitos obst culos com que tem de lidar. Ser Rodrigo capaz de superar as suas pr prias expetativas?