masterThesis
Propriedades magnéticas e magnetorresistência em filmes finos de Ni81Fe19
Fecha
2013-06-18Registro en:
NASCIMENTO JÚNIOR, Cristovão Porciano do. Propriedades magnéticas e magnetorresistência em filmes finos de Ni81Fe19. 2013. 67 f. Dissertação (Mestrado em Física da Matéria Condensada; Astrofísica e Cosmologia; Física da Ionosfera) - Universidade Federal do Rio Grande do Norte, Natal, 2013.
Autor
Nascimento Júnior, Cristovão Porciano do
Resumen
The ferromagnetic materials play an important role in the development of various
electronic devices and, have great importance insofar as they may determine the
efficiency, cost and, size of the devices. For this reason, many scientific researches is currently
focused on the study of materials at ever smaller scales, in order to understand
and better control the properties of nanoscale systems, i.e. with dimensions of the order
of nanometers, such as thin film ferromagnetic. In this work, we analyze the structural
and magnetic properties and magnetoresistance effect in Permalloy-ferromagnetic
thin films produced by magnetron sputtering. In this case, since the magnetoresistance
effect dependent interfaces of thin films, this work is devoted to the study of the magnetoresistance
in samples of Permalloy in nominal settings of: Ta[4nm]/Py[16nm]/Ta[4nm],
Ta[4nm]/Py[16nm]/O2/Ta[4nm], Ta[4nm]/O2/Py[16nm]/Ta[4nm], Ta[4nm]/O2/Py[16n
m]/O2/Ta[4nm], as made and subjected to heat treatment at temperatures of 160ºC, 360ºC
e 460ºC, in order to verify the influence of the insertion of the oxygen in the layer structure
of samples and thermal treatments carried out after production of the samples. Results are
interpreted in terms of the structure of the samples, residual stresses stored during deposition,
stresses induced by heat treatments and magnetic anisotropies