Abstract
We investigate the quasi-static magnetic, magnetotransport, and dynamic magnetic properties in ferromagnetic biphase films with distinct non-magnetic metallic spacer layers. We observe that the nature of the non-magnetic metallic spacer material does not have significant influence on the overall biphase magnetic behavior, and, consequently, on the magnetotransport and dynamic magnetic responses. We focus on the magnetoimpedance effect and verify that the films present asymmetric magnetoimpedance effect. Moreover, we explore the possibility of tuning the linear region of the magnetoimpedance curves around zero magnetic field by varying the probe current frequency in order to achieve higher sensitivity values. The invariance of the magnetic behavior and the asymmetric magnetoimpedance effect in ferromagnetic biphase films with distinct non-magnetic metallic spacers place them as promising candidates for probe element and open possibilities to the development of lower-cost high sensitivity linear magnetic field sensor devices.
Highlights
Advances in the field of the magnetization dynamics during the last decades have contributed to the comprehension in the context of fundamental physics on how the magnetization responds to external magnetic fields and electric currents, and have led to enormous progress in the development of sophisticated technological devices [1,2]
We show that the nature of the non-magnetic metallic spacer material does not have significant influence on the overall biphase magnetic behavior and, on the magnetotransport and dynamic magnetic responses
These features correspond to a clear signature that the shape of the MR curve is directly related to the magnetization reversal process and to the biphase magnetic behavior observed through the magnetization curves
Summary
Advances in the field of the magnetization dynamics during the last decades have contributed to the comprehension in the context of fundamental physics on how the magnetization responds to external magnetic fields and electric currents, and have led to enormous progress in the development of sophisticated technological devices [1,2]. Most of the soft magnetic materials are highly sensitive to small field variations at low magnetic fields, they use to show a nonlinear MI behavior around zero field [16] For this reason, the design of novel magnetic materials with optimized properties and specific dynamic magnetic response is fundamental, making possible the observation of new phenomena and their use to the development of a generation of technological devices. The invariance of the magnetic behavior and the AMI in ferromagnetic biphase films with distinct non-magnetic metallic spacers place them as promising candidates for probe element and represent an important step to the development of lower-cost high sensitivity linear magnetic field sensor devices
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