High-frequency magnetoimpedance effect in meander-line trilayered films

Abstract

We report a systematic study of structural properties and quasi-static and dynamical magnetization behavior of trilayered systems produced in the meander-line geometry. Our samples consist of NiFe/Cr/NiFe layers produced by the magnetron sputtering technique. Here we grow samples with NiFe and Cr layers in a wide thickness range, keeping constant the total thickness of the trilayer. The structural properties and the quasi-static magnetic behavior were characterized by X-ray diffraction and magnetization curves, respectively. The magnetization dynamics was investigated through the magnetoimpedance effect at the high-frequency regime. The sample geometry, as well as the configuration of the magnetic fields, employed in the magnetoimpedance measurements, enabled us to modify the frequency limits in which the distinct mechanisms are acting on the magnetoimpedance response. Hence, we are able to modify/tailor the impedance as a function of both the magnetic field and probe frequency. Our results pave the way for the exploration the meander-line geometry at the high-frequency regime in samples with low dimensionalities.