Study of the magnetic interface and its effect in Fe/NiFe bilayers of alternating order

Abstract

We deposited Fe/NiFe bilayers using magnetron sputtering and studied their static and dynamic properties. We performed PNR measurements and investigated whether the interfacial exchange coupling is responsible for the tuning of the magnetic properties.

Ferrimagnet GdFeCo Characterization for Spin‐Orbitronics: Large Field‐Like and Damping‐Like Torques

“…[32] Recently, it has been pointed out that actual or intrinsic damping in ferrimagnets is lower than that measured directly due to different spin density for each magnetic sublattice in GdFeCo and determined by domain wall mobility. [33] In the next section, we show how we can estimate the effective fields that drive the spin-orbit torque from Gd 25 As discussed, there are two symmetries for spin current generation in magnetic materials, SAHE-like and SHE-like. When these spin currents are absorbed by another magnetic layer, they contribute to the total torque on the magnetization…”

“…For NiFe, the saturation magnetization is 625 kA m −1 and the saturation field to place out of the plane of the film is 0.85 T. In the case of GdFeCo, the saturation magnetization is 115 kA m −1 and the saturation field to align along the plane is about 0.13 T which are typical values for both NiFe and Gd 25 Fe 65.6 Co 9.4 at room temperature. [ 23–25 ] From the saturation field and magnetizations, we can also estimate the effective saturation magnetization for both magnetic materials; it results kA m −1 and kA m −1 . The relatively low perpendicular magnetic anisotropy of GdFeCo allows its magnetization to be easily placed along the plane of the film which is useful for ST‐FMR measurements.…”