Magnetorresistência e correntes de spin em Multicamadas de Ni81Fe19/ZnO/Pd

• Autor(a) principal: Dugato, Danian Alexandre
• Data de Publicação: 2017
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Manancial - Repositório Digital da UFSM
• Texto Completo: http://repositorio.ufsm.br/handle/1/12779
• topic: Correntes de spin; Efeito Hall de spin inverso; Magnetorresistência; Spin current; Inverse spin Hall effect; Magnetoresistance; CNPQ::CIENCIAS EXATAS E DA TERRA::FISICA

In this work, we analyzed samples of thin films Ni81Fe19 and Pd with ZnO spacer. Ni81Fe19 is a ferromagnet with a low saturation magnetic field. Pd is a normal metal with high spinorbit coupling, much used in spin Hall effect and inverse spin Hall effect studies. ZnO is a semiconductor whose role is to reduce the charge current between layers. The sample have 5 nm of Ni81Fe19, 3 nm of Pd, and 2 nm of ZnO, with dimensions of 0.4 mm x 8 mm, deposited by magnetron sputtering. Using spin pumping we analyze the signal of the continuous voltage induced by ferromagnetic resonance. These samples the measured signal is a consequence of anisotropic magnetoresistance, anomalous Hall effect and inverse spin Hall effect. The thicknesses used contributes to a predominant inverse spin Hall effect signal. The ZnO spacer layer 2 nm reduces the effects of spin rectification, while maintaining spin current transfer.