Extrinsic contributions to spin-wave damping and renormalization in thin<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ni</mml:mi></mml:mrow><mml:mrow><mml:mn>50</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>50</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>films

Azevedo, A.; Oliveira, Alexandre Barbosa de; Aguiar, F. M. de; Rezende, S. M.

doi:10.1103/physrevb.62.5331

Cited by 102 publications

(65 citation statements)

References 12 publications

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“…They showed that lateral variations in the perpendicular uniaxial interface anisotropy field ͑due to the interface roughness͒ are a leading source of the two magnon scattering in ultrathin films. Azevedo et al 16 found in Ni 50 Fe 50 sputtered films that the measured variations of the FMR linewidth and field were consistent with the two magnon scattering model proposed by Arias and Mills.…”

Section: Introductionsupporting

confidence: 61%

Nanosecond magnetic relaxation processes in ultrathin metallic films prepared by MBE

et al. 2001

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Magnetic relaxation processes were investigated by ferromagnetic resonance ͑FMR͒ using crystalline Cr/ Fe/GaAs͑001͒ ultrathin film structures grown by molecular beam epitaxy ͑MBE͒. For Fe films thicker than 1.5 nm the extrinsic relaxation term showed evidence of two magnon scattering. Above 10 GHz the in-plane FMR linewidth was linearly dependent on the microwave frequency with an appreciable zero-frequency offset. The zero frequency offset measures the strength of extrinsic damping. The in-plane Gilbert damping includes both the intrinsic and extrinsic Gilbert contributions in qualitative agreement with recent predictions by Arias and Mills.

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Section: Introductionsupporting

confidence: 61%

Nanosecond magnetic relaxation processes in ultrathin metallic films prepared by MBE

et al. 2001

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“…2(a)]. The large effective intrinsic damping α 0 in our samples can be understood in terms of efficient two-magnon scattering induced by roughness in thin ferromagnetic films [33,34], especially when magnetized in the film plane [35].…”

Section: A In-plane Measurements and Simulationsmentioning

confidence: 99%

Current-induced spin torque resonance of a magnetic insulator

et al. 2015

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We report the observation of current-induced spin torque resonance in yttrium iron garnet/platinum bilayers. An alternating charge current at GHz frequencies in the platinum gives rise to dc spin pumping and spin Hall magnetoresistance rectification voltages, induced by the Oersted fields of the ac current and the spin Hall effect-mediated spin transfer torque. In ultrathin yttrium iron garnet films, we observe spin transfer torque actuated magnetization dynamics which are significantly larger than those generated by the ac Oersted field. Spin transfer torques thus efficiently couple charge currents and magnetization dynamics also in magnetic insulators, enabling charge current-based interfacing of magnetic insulators with microwave devices.

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“…Our predictions seem confirmed by recent experiments. 7 One can inquire if the two magnon mechanism is operative in nanowires as well.…”

Section: Discussionmentioning

confidence: 99%

“…This will lead to extrinsic contributions to the ferromagnetic resonance linewidth similar to those demonstrated to be substantial in ultrathin ferromagnetic films. 7 Also, when the ferromagnetic resonance mode of the nanowire is excited, the precession of the magnetization leads to large magnetic fields outside the sample, in contrast to the case of thin films, where the field is confined to the film interior. There should then be strong interactions between nanowires, in dense arrays such as those explored by Ebels and Wigen.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, one realizes short wavelength spin-wave modes degenerate in frequency with the uniform mode of the cylinder excited in ferromagnetic resonance. If the cylinder surfaces are not perfectly smooth, the two magnon dipolar mechanism operative in ultrathin films 6,7 should then also be ''active'' in the ferromagnetic nanowires. This will lead to extrinsic contributions to the ferromagnetic resonance linewidth similar to those demonstrated to be substantial in ultrathin ferromagnetic films.…”

Section: Introductionmentioning

confidence: 99%

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Theory of Spin Excitations and the Microwave Response of Cylindrical Ferromagnetic Nanowires

Mills

2001

Band-Ferromagnetism

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We develop the theory of exchange/dipole spin wave excitations of ferromagnetic nanowires of cylindrical cross section, where the magnetization is parallel to the axis of the wire. In addition, we provide the theory of the microwave response of such structures, for the case where the nanowire is also a conductor. We present explicit calculations of both the mode structure of nanowires, and also their ferromagnetic resonance spectrum, with attention to recent experimental studies. We compare differences between the physical picture appropriate for the cylinder, with the well studied case of the ferromagnetic film.

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Extrinsic contributions to spin-wave damping and renormalization in thinNi50Fe50films

Cited by 102 publications

References 12 publications

Nanosecond magnetic relaxation processes in ultrathin metallic films prepared by MBE

Nanosecond magnetic relaxation processes in ultrathin metallic films prepared by MBE

Current-induced spin torque resonance of a magnetic insulator

Theory of Spin Excitations and the Microwave Response of Cylindrical Ferromagnetic Nanowires

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