Ferromagnetic coupled modes in continuous/granular multilayers: Model and experiments

Gómez, J.; Weston, James; Butera, A.

doi:10.1103/physrevb.76.184416

Cited by 11 publications

(10 citation statements)

References 18 publications

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“…In the past, ferromagnetic resonance (FMR) has been widely used to study magnetization dynamics of multilayer systems [11][12][13][14][15] and exchange-coupled bi-and trilayer systems [16][17][18]. Both broadband coplanar waveguide (CPW) and resonant cavity FMR techniques are commonly employed.…”

Section: Introductionmentioning

confidence: 99%

Magnetization dynamics in an exchange-coupled NiFe/CoFe bilayer studied by x-ray detected ferromagnetic resonance

et al. 2015

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Exchange-coupled hard and soft magnetic layers find extensive use in data storage applications, for which their dynamical response has great importance. With bulk techniques, such as ferromagnetic resonance (FMR), it is difficult to access the behaviour and precise influence of each individual layer. By contrast, the synchrotron radiation-based technique of x-ray detected ferromagnetic resonance (XFMR) allows element-specific and phase-resolved FMR measurements in the frequency range 0.5-11 GHz. Here, we report the study of the magnetization dynamics of an exchange-coupled Ni 0.81 Fe 0.19 (43.5 nm)/Co 0.5 Fe 0.5 (30 nm) bilayer system using magnetometry and vector network analyser FMR, combined with XFMR at the Ni and Co L 2 x-ray absorption edges. The epitaxially grown bilayer exhibits two principal resonances denoted as the acoustic and optical modes. FMR experiments show that the Kittel curves of the two layers cannot be taken in isolation, but that their modelling needs to account for an interlayer exchange coupling. The angular dependence of FMR indicates a collective effect for the modes of the magnetically hard CoFe and soft NiFe layer. The XFMR precessional scans show that the acoustic mode is dominated by the Ni signal with the Co and Ni magnetization precessing in phase, whereas the optical mode is dominated by the Co signal with the Co and Ni magnetization precessing in anti-phase. The response of the Co signal at the Ni resonance, and vice versa, show induced changes in both amplitude and phase, which can be ascribed to the interface exchange coupling. An interesting aspect of phase-resolved XFMR is the ability to distinguish between static and dynamic exchange coupling. The element-specific precessional scans of the NiFe/CoFe bilayer clearly have the signature of static exchange coupling, in which the effective field in one layer is aligned along the magnetization direction of the other layer.

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Section: Introductionmentioning

confidence: 99%

Magnetization dynamics in an exchange-coupled NiFe/CoFe bilayer studied by x-ray detected ferromagnetic resonance

et al. 2015

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“…[5] this kind of samples present a high exchange interaction between the Fe and the granular layers, and for thin spacer thicknesses a weak interaction appears between the Ni 80 Fe 20 layer and the rest of the film. In Ref.…”

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confidence: 96%

“…In Ref. [5] it is suggested to use corrected values of M 1 and d 1 in order to describe the highly interacting Fe/Fe-SiO 2 layer. On the other hand, M 2 and d 2 are coincident with the magnetization and thickness of the Ni 80 Fe 20 layer.…”

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confidence: 99%

“…On the other hand, M 2 and d 2 are coincident with the magnetization and thickness of the Ni 80 Fe 20 layer. These parameters should be corrected in the following way [5]: Py stands for Ni 80 Fe 20 ). Due to the presence of a small perpendicular anisotropy the effective magnetization used in the simulations is M eff (i) ¼ M i ÀK ni /2pM i .…”

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confidence: 99%

“…It is possible to calculate the imaginary part of the scalar susceptibility (w 00 ) [5,6], which is proportional to the microwave absorbed power. This can be done as a function of the angle of incidence of the magnetic field H to find numerically the values of M 1 , M 2 , a 1 , a 2 , and H E =…”

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confidence: 99%

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Angular dependence of the ferromagnetic resonance spectrum in continuous/heterogeneous multilayers

Gómez

Weston

Butera

2008

Journal of Magnetism and Magnetic Materials

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Controlling the crystalline and magnetic texture in sputtered Fe0.89Ga0.11
Ramirez
¹
,
Malamud
²
,
Gómez
³

et al. 2019
Journal of Magnetism and Magnetic Materials
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8
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In this work we present a careful study on the relationship between the magnetic and structural properties of a highly magnetostrictive Fe 0.89 Ga 0.11 (Fe-Ga) alloy deposited onto glass, Si and MgO substrates. When grown on glass, the films are polycrystalline with randomly oriented grains without any texture, while the ones on Si and MgO present preferred growth directions. Fe-Ga/Si films show a [113] fibre-like texture, and Fe-Ga/MgO presents a quasi monocrystalline behavior with the (100) film plane direction parallel to the substrate surface. When Fe-Ga/MgO films are annealed an additional (110) texture is also observed. Magnetometry and ferromagnetic resonance (FMR) show that the magnetic behavior is closely related to the structural observed textures. Furthermore, the structural analysis allowed us to get a deeper understanding of the magnetic behavior. This point is very important to get the ability of controlling the crystalline texture by means of growing onto different substrates and/or thermal treatments, which in turns opens the possibility of handling the magnetic texture which is particularly important in magnetostrictive materials for electronic devices.

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Ferromagnetic coupled modes in continuous/granular multilayers: Model and experiments

Cited by 11 publications

References 18 publications

Magnetization dynamics in an exchange-coupled NiFe/CoFe bilayer studied by x-ray detected ferromagnetic resonance

Magnetization dynamics in an exchange-coupled NiFe/CoFe bilayer studied by x-ray detected ferromagnetic resonance

Angular dependence of the ferromagnetic resonance spectrum in continuous/heterogeneous multilayers

Controlling the crystalline and magnetic texture in sputtered Fe0.89Ga0.11
Ramirez
¹
,
Malamud
²
,
Gómez
³

et al. 2019
Journal of Magnetism and Magnetic Materials
Self Cite
12
4
8
0
View full text Add to dashboard Cite

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Ferromagnetic coupled modes in continuous/granular multilayers: Model and experiments

Cited by 11 publications

References 18 publications

Magnetization dynamics in an exchange-coupled NiFe/CoFe bilayer studied by x-ray detected ferromagnetic resonance

Magnetization dynamics in an exchange-coupled NiFe/CoFe bilayer studied by x-ray detected ferromagnetic resonance

Angular dependence of the ferromagnetic resonance spectrum in continuous/heterogeneous multilayers

Controlling the crystalline and magnetic texture in sputtered Fe0.89Ga0.11Ramirez1, Malamud2, Gómez3 et al. 2019Journal of Magnetism and Magnetic MaterialsSelf Cite12480View full textAdd to dashboardCite

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Controlling the crystalline and magnetic texture in sputtered Fe0.89Ga0.11
Ramirez
¹
,
Malamud
²
,
Gómez
³

et al. 2019
Journal of Magnetism and Magnetic Materials
Self Cite
12
4
8
0
View full text Add to dashboard Cite