Intensity enhancement of ferromagnetic resonance modes in exchange coupled magnetic multilayers

Abstract

In this work, the ferromagnetic resonance characteristics of a NiFeCu/Non-magnetic(NM)/NiFe/ NM/CoFe/NM/Co multilayer is studied from a theoretical point of view, and comparisons with the ferromagnetic resonance of a NiFe/NM/CoFe magnetic bilayer are presented. It is found that the resonance modes of the multilayer tend to be more intense than those of the bilayer for several combinations of applied field and interlayer exchange coupling. Furthermore, rules governing the individual layer contributions to the resonance modes of a exchanged coupled magnetic multilayer are presented, which would apply to any number of layers. These results open the possibility to tailor the resonance frequencies of the multilayer structure by either engineering the interlayer exchange coupling or by applying a perpendicular magnetic field for multiband high frequency magnetic devices.

Nonreciprocal magnetoacoustic waves in synthetic antiferromagnets with Dzyaloshinskii-Moriya interaction

“…The unit vector u is assumed to be orientated in the plane of the magnetic film and makes the angle φ l ani with the x axis. We neglect interlayer demagnetization fields since the lateral size of the fabricated sample is much larger than its thickness [23,59].…”

Modulated critical currents of spin-transfer torque-induced resistance changes in NiCu/Cu multilayered nanowires

“…Moreover, it enables a larger number of free layers, whose magnetization can be flipped by STT [ 10 ] in one nanowire [ 9 , 11 ]. Comparing with the classical trilayer system (including one hard layer with fixed magnetization, one free layer, and one nonmagnetic spacer layer in between) [ 10 ], the presence of more free layers enhances, for example, the magnetoresistance (MR) [ 7 , 13 ] and ferromagnetic resonance modes [ 14 – 15 ]. Meanwhile it has been shown that it might also lead to sequential flipping of different free layers, which, on the one hand, increases the complexity of the STT effects [ 16 ] and, on the other hand, expands its applications [ 5 ].…”