Navegando por Autor "Pinto, Roberta Dutra de Oliveira"
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Artigo Angular dependence of asymmetric magnetoimpedance in exchange biased NiFe/IrMn multilayers(AIP Publishing LLC, 2014-03-11) Silva, Ricardo Barreto da Silva; Corrêa, Marcio Assolin; Silva, Edimilson Felix da; Mori, Thiago José de Almeida; Della Pace, Rafael Domingues; Pinto, Roberta Dutra de Oliveira; Viegas, Alexandre Da Cas; Bohn, Felipe; Sommer, Rubem LuisWe investigate the angular dependence of asymmetric magnetoimpedance of NiFe/IrMn multilayers and explore the possibility of tuning the linear region of the magnetoimpedance curves by modifying the angle between the applied external magnetic field and exchange bias field, and probe current frequency. We quantify the sensitivity by calculating the ratio jDZj=jDHj at low magnetic fields as a function of the frequency for samples cut with different orientations and show that considerable values in the linear region around zero field can be reached. The results extend the possibilities for application of exchange biased magnetoimpedance multilayers as probe element for the development and improvement of auto-biased linear magnetic field sensorsArtigo Improving the sensitivity of asymmetric magnetoimpedance in exchange biased NiFe/IrMn multilayers(Elsevier, 2015-06-23) Silva, Ricardo Barreto da; Silva, Edimilson Felix da; Mori, Thiago José de Almeida; Della Pace, Rafael Domingues; Pinto, Roberta Dutra de Oliveira; Corrêa, Marcio Assolin; Bohn, Felipe; Sommer, Rubem Luis SommerWe investigate the asymmetric magnetoimpedance effect in exchange biased NiFe/IrMn multilayers and explore the possibility of tailoring the linear region of the curves around zero magnetic field by playing with the thickness of the ferromagnetic layers, probe current frequency, and the orientation between external magnetic field and exchange bias field direction. We quantify the sensitivity by calculating the dZ/dH|H=0 in a wide range of frequencies. The highest sensitivity is observed for the thicker multilayer, reaching 160 m/Oe ∼ Ω at ∼2.0 GHz. The results place exchange biased magnetoimpedance multilayers as attractive candidates for the development of auto-biased linear magnetic field sensors