Ferromagnetic resonance studies of Fe/Ni and Fe/CoNbZr multilayers: Model and experiments

Abstract

Influence of dynamical dipolar coupling on spin-torque-induced excitations in a magnetic tunnel junction nanopillar J. Appl. Phys. 111, 07C906 (2012) Quasi-omnidirectional electrical spectrometer for studying spin dynamics in magnetic tunnel junctions Rev. Sci. Instrum. 83, 024710 (2012) Thermal-magnetic-electric oscillator based on spin-valve effect J. Appl. Phys. 111, 044315 (2012) Dependence of spin-transfer switching characteristics in magnetic tunnel junctions with synthetic free layers on coupling strength J. Appl. Phys. 111, 07C905 (2012) Electrical manipulation of spin polarization and generation of giant spin current using multi terminal spin injectors J. Appl. Phys. 111, 07C505 (2012) Additional information on J. Appl. Phys. Ferromagnetic resonance (FMR) studies were carried out on Fe/Ni and FeKoNbZr multilayers. A simple model taking into consideration the multilayered nature of the film was used to calculate the field positions and mode intensities of the experimental spectra. The complicated intensity patterns of the modes observed in the FMR spectra of the multilayers were explained in terms of model calculations. The analysis of the spectra showed that the interface in case of these multilayers is not sharp and suggested the formation of interfacial alloy. 0 1995' American Institute of Physics.

Ferromagnetic resonance spectra in Co/Nb multilayers with large Co thickness

“…͑4͒ The field separations between various modes are much smaller in comparison to those observed in the case of magnetic/magnetic multilayers. 17 The first point mentioned above clearly indicates that the coupling between magnetic layers exists even when the thickness of nonmagnetic layers is as large as 135 Å. This is because, if the coupling was absent, the multiple resonances can be seen only because of spin wave excitation in a single Co layer.…”

“…In the case of magnetic/ magnetic multilayers, Acharya et al 17 solved Eq. ͑1͒ in individual layers by substituting the standard values of constants for that layer and for a particular value of applied field H 0 .…”

“…An algorithm similar to Acharya et al, 17 but with two modifications, was used in this work to predict the FMR response. Equation ͑1͒ was solved only in magnetic layers and applied boundary conditions used were those given by Eq.…”

“…In this paper we report a modification of the model used by Acharya et al 17 so that it can also be applied to magnetic/ nonmagnetic multilayers. Further, we use this modified model to study the perpendicular FMR spectra on three Co/Nb multilayers.…”

“…Recently Acharya et al 17 made an attempt to explain the field and intensity pattern of perpendicular FMR spectra ͑the dc magnetic field applied normal to the film plane͒ of magnetic/magnetic multilayers. They used a model similar to that proposed by Wilts and Prasad 18 for studying ionimplanted bubble films.…”