Dissertação
Estudo de exchange bias via magnetorresistência anisotrópica
Fecha
2013-08-15Registro en:
ROSA, Diego Saldanha da. Study of exchange bias via anisotropic magnetoresistance. 2013. 46 f. Dissertação (Mestrado em Física) - Universidade Federal de Santa Maria, Santa Maria, 2013.
Autor
Rosa, Diego Saldanha da
Institución
Resumen
Anisotropic magnetoresistance (AMR) corresponds to the change of R in an ferromagnetic
material with the angle between electric current and magnetization. Sensors using this
effect are suited to detect both angular and linear displacements.
In this work, structural, magnetic and electric characterization were performed in order
to study the exchange interaction between antiferromagnetic IrMn and ferromagnetic NiFe, in
a bilayer and a multilayer.
Simulations of the AMR measurements were performed and showed good agreement
with the experimental data. Different anisotropy field values were observed. The difference
between the anisotropy field and the exchange field values is responsible for the different AMR
data sets extracted from each sample.
The model takes into account the, anisotropy (uniaxial), Zeeman, and exchange-bias
(unidirectional) energies was used to explain the observed behavior.