Angular Dependence of the Ferromagnetic Resonance Parameters of [Ti/FeNi]₆/Ti/Cu/Ti/[FeNi/Ti]₆ Nanostructured Multilayered Elements in the Wide Frequency Range

Abstract

Magnetically soft [Ti(6)/FeNi(50)]6/Ti(6)/Cu(500)/Ti(6)/[FeNi(50)/Ti(6)]6 nanostructured multilayered elements were deposited by rf-sputtering technique in the shape of elongated stripes. The easy magnetization axis was oriented along the short size of the stripe using deposition in the external magnetic field. Such configuration is important for the development of small magnetic field sensors employing giant magnetoimpedance effect (GMI) for different applications. Microwave absorption of electromagnetic radiation was experimentally and theoretically studied in order to provide an as complete as possible high frequency characterization. The conductor-backed coplanar line was used for microwave properties investigation. The medialization for the precession of the magnetization vector in the uniformly magnetized GMI element was done on the basis of the Landau−Lifshitz equation with a dissipative Bloch−Bloembergen term. We applied the method of the complex amplitude for the analysis of the rotation of the ferromagnetic GMI element in the external magnetic field. The calculated and experimental dependences for the amplitudes of the imaginary part of the magnetic susceptibility tensor x-component and magnetoabsorption related to different angles show a good agreement.

Keywords

• nanoscale multilayers
• nanostructuring
• magnetic properties
• dynamic magnetic permeability
• giant magnetoimpedance effect
• ferromagnetic resonance
• magnetic sensor applications