Spin-wave resonance and magnetic anisotropy in FePt thin films

Martins, Alessandro; Trippe, S.C.; Santos, Amilton M.; Pelegrini, F.

doi:10.1016/j.jmmm.2006.05.031

Cited by 25 publications

(19 citation statements)

References 25 publications

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“…Assuming long in-plane wavelengths, with the approximation of unpinned spins at surfaces, the frequencies of the perpendicular standing spin waves (PSSWs) in thin film layer of thickness d m are given by (in analogy with Ref. [12]):…”

Section: Article In Pressmentioning

confidence: 99%

Anisotropy and dynamic properties of Co2MnGe Heusler thin films

Belmeguenai

Zighem

Woltersdorf

et al. 2009

Journal of Magnetism and Magnetic Materials

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Section: Article In Pressmentioning

confidence: 99%

Anisotropy and dynamic properties of Co2MnGe Heusler thin films

Belmeguenai

Zighem

Woltersdorf

et al. 2009

Journal of Magnetism and Magnetic Materials

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“…[3][4][5][6] In this work we use the FMR technique to show that the structural differences between the multilayers, Si͑100͒/͓Fe 19 Ni 81 ͑40 Å͒ /Al͑13.3 Å͒ /Fe 50 Mn 50 ͑70 Å͒ / Al͑13.3 Å͔͒ ϫ 10 and Si͑100͒/͓Fe 50 Mn 50 ͑53 Å͒ /Al͑6.7 Å͒ / Fe 19 Ni 81 ͑30 Å͒ /Al͑6.7 Å͔͒ ϫ 20 give rise to distinct magnetic properties. 1,2 Several techniques can be used to investigate the effect of a specific growth parameter and its manipulation on the magnetic properties of thin films and multilayers.…”

Section: Ferromagnetic Resonance Study Of Magnetic Phases In Feni/ Almentioning

confidence: 99%

“…2; a crossover point at which they are superposed and have the same absorption field is attained when the applied field is turned way by about 9°from the normal to the film. [4][5][6] The analysis of the experimental results for the uniform mode is considered in terms of the FMR theory of a single layer film. The perpendicular FMR spectrum of the FeMn-ML in Fig.…”

Section: Ferromagnetic Resonance Study Of Magnetic Phases In Feni/ Almentioning

confidence: 99%

Ferromagnetic resonance study of magnetic phases in FeNi∕Al∕FeMn∕Al and FeMn∕Al∕FeNi∕Al multilayers

Jesus

Pelegrini

Borges

et al. 2007

Journal of Applied Physics

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A comparative ferromagnetic resonance (FMR) study of the magnetic properties of Si(100)[FeNi∕Al∕FeMn∕Al]×10 and Si(100)[FeMn∕Al(6Å)∕FeNi(30Å)∕Al]×20 multilayers is reported. Besides the uniform mode, the parallel and perpendicular FMR spectra of both multilayers also give evidence of additional magnetic phases in the films. The perpendicular FMR spectrum of the first multilayer also shows the presence of a volume spin-wave resonance (SWR) mode, while the spectrum of the second shows the presence of a surface SWR mode. This is attributed to the structural differences between the two multilayers in terms of the thicknesses of the magnetic (FeNi) and nonmagnetic (FeMn and Al) layers.

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“…Significant efforts were applied to elucidating physics of ferromagnetic resonance measurements of thick magnetic films, notably of eddy current and exchange-conductivity contributions to the resonance frequency and linewidth in metals. [27][28][29][30][31] Subsequent studies concentrated on various magnetic thin films and multilayers, [32][33][34][35][36][37] with a focus on the spectrum of their spinwave resonances. Here, we present a theory of the highfrequency permeability resulting from such resonances in very thin films with surface pinning and its application to the issue of designing the negative effective permeability.…”

Section: Introductionmentioning

confidence: 99%

Negative permeability due to exchange spin-wave resonances in thin magnetic films with surface pinning

2010

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We report a theory of the effective permeability of multilayered metamaterials containing thin ferromagnetic layers with magnetization pinned on either one or both surfaces. Because of the pinning and small film thickness, the lowest frequency magnetic resonances are due to nonuniform exchange spin waves with frequencies far above those expected for uniform ferromagnetic resonance in known magnetic materials. Yet, the coupling of the nonuniform spin-wave modes to the electromagnetic field is shown to be strong enough to lead, for magnetic parameters characteristic for conventional transition metal alloys, to negative values of the effective permeability at frequencies of several hundred gigahertzs. The permittivity of metals is already negative in this frequency range. Hence, this system represents a negative refractive index metamaterial at subterahertz frequencies. The ways by which to maximize the frequency and the strength of the negative magnetic response are analyzed.

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Spin-wave resonance and magnetic anisotropy in FePt thin films

Cited by 25 publications

References 25 publications

Anisotropy and dynamic properties of Co2MnGe Heusler thin films

Anisotropy and dynamic properties of Co2MnGe Heusler thin films

Ferromagnetic resonance study of magnetic phases in FeNi∕Al∕FeMn∕Al and FeMn∕Al∕FeNi∕Al multilayers

Negative permeability due to exchange spin-wave resonances in thin magnetic films with surface pinning

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