article
Tunable asymmetric magnetoimpedance effect in ferromagnetic NiFe/Cu/Co films
Fecha
2014-09-11Registro en:
1077-3118
0003-6951
Autor
Gomes, Matheus Gamino
Silva, Edimilson Felix da
Andrade, A. M. H.
Corrêa, Marcio Assolin
Vásquez, M.
Bohn, Felipe
Resumen
We investigate the magnetization dynamics through the magnetoimpedance effect in ferromagnetic NiFe/Cu/Co films. We observe that the magnetoimpedance response is dependent on the thickness
of the non-magnetic Cu spacer material. We verify asymmetric magnetoimpedance in films with
biphase magnetic behavior and explore the possibility of tuning the linear region of the magnetoimpedance
curves around zero magnetic field by varying the thickness of the spacer and probe current
frequency. We discuss the experimental results in terms of the different mechanisms governing the
magnetization dynamics at distinct frequency ranges, quasi-static magnetic properties, thickness of
the spacer, and the kind of the magnetic interaction between the ferromagnetic layers. The results
place films with biphase magnetic behavior exhibiting asymmetric magnetoimpedance effect as
very attractive candidates for application as probe element in the development of auto-biased linear
magnetic field sensors