Ferromagnetoelastic Resonance in Thin Films. II. Application to Nickel

Kobayashi, Toshio; Barker, R. C.; Yelon, A.

doi:10.1103/physrevb.7.3286

Cited by 27 publications

(19 citation statements)

References 16 publications

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“…It should be pointed out that Suhl's theory does not treat the magnon-phonon interaction selfconsistenly. Selfconsistent calculations were carried out by Kobayashi et al [13]. They showed that the magnetoelasticity can have only an appreciable effect on the FMR linewidth if the excited elastic wave establishes a resonant mode across the film thickness at or near the FMR field.…”

Section: B Phonon Dragmentioning

confidence: 99%

“…This effect was called ferromagnetic elastic resonance (FMER). In Ni, the FMER effect can even result in a split FMR peak, see details in [13]. After an extensive and systematic effort to observe FMER in films of perfect Ni and Ni-Co platelets no convincing results were achieved.…”

Section: B Phonon Dragmentioning

confidence: 99%

“…With an increasing the energy balance in the denominator of (10) becomes eventually comparable to . Momentum and energy conservation now play an important role in the sum over the Fermi surface for the intraband Gilbert damping and one finds (13) where is the wave number of a resonant magnon. For , the expression in (13) saturates and inversely depends on .…”

Section: Spin Orbit Relaxation In Metallic Ferromagnetsmentioning

confidence: 99%

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Magnetic relaxations in metallic multilayers

2002

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Abstract-The intrinsic damping mechanism in metals caused by incoherent scattering of itinerant electron-hole pair excitations by phonons and magnons will be reviewed. The unique features of magnetic relaxations in multilayers were studied by ferromagnetic resonance (FMR) using magnetic single, Au-Fe-GaAs(001), and double layer Au-Fe-Au-Fe-GaAs(001) structures prepared by molecular beam epitaxy. The magnetic relaxation in single-layer films is described by the Gilbert damping with no extrinsic contributions to the FMR linewidth. These films provided an excellent opportunity to investigate nonlocal damping. The main result of these studies is that ultrathin Fe films in magnetic double layers acquire an additional interface Gilbert damping. This is in agreement with recent predictions of nonlocal interface damping which is based on the transport of spin angular momentum between the ferromagnetic layers. Measurements of the nonlocal Gilbert damping offer a possibility to carry out quantitative studies of the relaxation torques caused by nonlocal spin momentum transfer. Numerical simulations of magnetization reversal and stationary precession for an applied perpendicular current in Au-Fe-Au-Fe-GaAs(001) multilayers will be shown.Index Terms-Ferromagnetic resonance, magnetic multilayers, nonlocal spin relaxations.

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Section: B Phonon Dragmentioning

confidence: 99%

Section: B Phonon Dragmentioning

confidence: 99%

Section: Spin Orbit Relaxation In Metallic Ferromagnetsmentioning

confidence: 99%

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Magnetic relaxations in metallic multilayers

2002

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“…This is not surprising since Terfenol-D's unique magnetostrictive behavior will not be clearly exhibited in a reflection experiment unless the sample is extremely thin. 4,5 The magnetoelastic properties, however, figure prominently in a microwave transmission experiment. It is the purpose of this article to present calculations of the expected microwave transmission through Terfenol-D and to draw attention to the qualitative features that are due to the large magnetostriction.…”

Section: Introductionmentioning

confidence: 98%

Effect of the large magnetostriction of Terfenol-D on microwave transmission

Dewar

1997

Journal of Applied Physics

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The calculated transmission of microwave power at GHz frequencies through Terfenol-D (Tb0.27Dy0.73Fe2) is strongly influenced by the enormous magnetostriction parameter of this material. For conditions satisfying ferromagnetic resonance there is a peak in the transmission corresponding to sound and spin waves transporting energy through a slab-shaped sample. The magnetostriction mixes the character of these waves; the calculated transmission also depends on the exchange stiffness parameter, the elastic constants, and the radio-frequency magnetic properties. With thin (<40 μm) samples for which the static magnetization is along the magnetically soft (111) direction the calculated transmission peak is augmented by a fringe pattern with more than 20 secondary peaks. This arises from interference between spin and sound waves. For the configuration with the static magnetization oriented along the magnetically hard (100) direction the fringe pattern is absent. In this configuration the spin wave is a soft mode and the sample should develop a static distortion of the magnetization and lattice. The periodicity of this static distortion is tunable with an external magnetic field, although lattice imperfections may introduce hysteresis by pinning the distortion.

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“…This effect is appreciable only if resonant conditions exist for the elastic wave, and the resonant frequency is similar to that of the FMR frequency. Due to the long wave-length of such resonant modes, direct phonon coupling is not a significant contribution to precessional damping [49].…”

Section: Direct Electron and Phonon Couplingmentioning

confidence: 99%

Ultrafast Magnetization Dynamics of SrRuO<sub>3 </sub>Thin Films

Langner

2009

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Itinerant ferromagnet SrRuO 3 has drawn interest from physicists due to its unusual transport and magnetic properties as well as from engineers due to its low resistivity and good lattice-matching to other oxide materials. The exact electronic structure remains a mystery, as well as details of the interactions between magnetic and electron transport properties.This thesis describes the use of time-resolved magneto-optical Kerr spectroscopy to study the ferromagnetic resonance of SrRuO 3 thin films, where the ferromagnetic resonance is initiated by a sudden change in the easy axis direction in response to a pump pulse.The rotation of the easy axis is induced by laser heating, taking advantage of a temperature-dependent easy axis direction in SrRuO 3 thin films. By measuring the change in temperature of the magnetic system in response to the laser pulse, we find that the specific heat is dominated by magnons up to unusually high temperature, ∼ 100 K, and thermal diffusion is limited by a boundary resistance between the film and the substrate that is not consistent with standard phonon reflection and scattering models.We observe a high FMR frequency, 250 GHz, and large Gilbert damping parameter, α ≈ 1, consistent with strong spin-orbit coupling. We observe a time-dependent change in the easy axis direction on a ps time-scale, and we find that parameters associated with the change in easy axis, as well as the damping parameter, have a non-monotonic temperature dependence similar to that observed in anomalous Hall measurements. Professor Joseph Orenstein Dissertation Committee Chair iFor my family ii

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Ferromagnetoelastic Resonance in Thin Films. II. Application to Nickel

Cited by 27 publications

References 16 publications

Magnetic relaxations in metallic multilayers

Magnetic relaxations in metallic multilayers

Effect of the large magnetostriction of Terfenol-D on microwave transmission

Ultrafast Magnetization Dynamics of SrRuO<sub>3 </sub>Thin Films

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