Angular dependence of spin-wave resonances and surface spin pinning in ferromagnetic (Ga,Mn) As films

Liu, X.; Zhou, Y. Y.; Furdyna, J. K.

doi:10.1103/physrevb.75.195220

Cited by 64 publications

(67 citation statements)

References 32 publications

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“…A more than an order of magnitude experimental scatter and a lack of any clear trend as a function of Mn doping can be found in the previous literature for the Gilbert damping and spin stiffness constants (Supplementary Note 3) [19][20][21][22][23][24][25][26][27][28] . Significant variations can be also found in the experimental magnetic anisotropy constants of (Ga,Mn)As (ref.…”

Section: Resultsmentioning

confidence: 94%

The essential role of carefully optimized synthesis for elucidating intrinsic material properties of (Ga,Mn)As

et al. 2013

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(Ga,Mn)As is at the forefront of spintronics research exploring the synergy of ferromagnetism with the physics and the technology of semiconductors. However, the electronic structure of this model spintronics material has been debated and the systematic and reproducible control of the basic micromagnetic parameters and semiconducting doping trends has not been established. Here we show that seemingly small departures from the individually optimized synthesis protocols yield non-systematic doping trends, extrinsic charge and moment compensation, and inhomogeneities that conceal intrinsic properties of (Ga,Mn)As. On the other hand, we demonstrate reproducible, well controlled and microscopically understood semiconducting doping trends and micromagnetic parameters in our series of carefully optimized epilayers. Hand-in-hand with the optimization of the material synthesis, we have developed experimental capabilities based on the magneto-optical pumpand-probe method that allowed us to simultaneously determine the magnetic anisotropy, Gilbert damping and spin stiffness constants from one consistent set of measured data.

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Section: Resultsmentioning

confidence: 94%

The essential role of carefully optimized synthesis for elucidating intrinsic material properties of (Ga,Mn)As

et al. 2013

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“…Kittel [33] has shown that pinning of the magnetization at the surface is required for SWR (the absorption of spatially homogeneous microwaves by higher-order spin waves), and the symmetrically pinned boundaries merely render odd modes observable. Here we adopt boundary conditions m[(L ± d)/2] = 0, which can be justified by sufficiently strong surface anisotropies [34,35]. The standing spin-wave frequencies are ω…”

Section: B Ferromagnet ( J > 0)mentioning

confidence: 99%

Exchange magnon-polaritons in microwave cavities

et al. 2015

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We formulate a scattering theory to study magnetic films in microwave cavities beyond the independent-spin and rotating-wave approximations of the Tavis-Cummings model. We demonstrate that strong coupling can be realized not only for the ferromagnetic resonance mode, but also for spin-wave resonances; the coupling strengths are mode dependent and decrease with increasing mode index. The strong-coupling regime can also be accessed electrically by spin pumping into a metal contact.

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“…Spin-wave resonance in thin films has been studied particularly intensively in gallium manganese arsenide in the past decade12161718192021222324252627. Especially rich resonance spectra were obtained in studies with a variable configuration of the static field with respect to the film surface.…”

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confidence: 99%

Spin-Wave Resonance Model of Surface Pinning in Ferromagnetic Semiconductor (Ga,Mn)As Thin Films

Puszkarski

Tomczak

2014

Sci Rep

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The source of spin-wave resonance (SWR) in thin films of the ferromagnetic semiconductor (Ga,Mn)As is still under debate: does SWR stem from the surface anisotropy (in which case the surface inhomogeneity (SI) model would apply), or does it originate in the bulk inhomogeneity of the magnetic structure of the sample (and thus requires the use of the volume inhomogeneity (VI) model)? This paper outlines the ground on which the controversy arose and shows why in different conditions a resonance sample may meet the assumptions of either the SI or the VI model.

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Angular dependence of spin-wave resonances and surface spin pinning in ferromagnetic (Ga,Mn) As films

Cited by 64 publications

References 32 publications

The essential role of carefully optimized synthesis for elucidating intrinsic material properties of (Ga,Mn)As

The essential role of carefully optimized synthesis for elucidating intrinsic material properties of (Ga,Mn)As

Exchange magnon-polaritons in microwave cavities

Spin-Wave Resonance Model of Surface Pinning in Ferromagnetic Semiconductor (Ga,Mn)As Thin Films

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