Microwave Photon Generation by Thin Magnetic Films

Seavey, Jr. M.H.

doi:10.1109/t-ue.1963.29301

Cited by 18 publications

(2 citation statements)

References 8 publications

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“…This indicates that the high-frequency mode originates from the coherent LA phonon generation in GaAs buffer, and the low-frequency mode should be associated with the coherent LA phonon generation in Co 2 FeAl layer [38,40] . Recall that the optical penetration depth at 800 nm for Co 2 FeAl is only ~ 17.6 nm [47] , the greatly attenuated pumping intensity passing through a thick Co 2 FeAl (45 nm) layer will be too weak to optically excite coherent phonons in the underneath GaAs, thus the detected coherent phonon responses from a thick Co 2 FeAl layer and its underneath GaAs buffer should mainly arise from the magnetoelastic coupling [48][49][50][51][52][53] . As for the mode with a frequency of ~34 GHz, its negligible frequency dependence on the probe wavelength suggests that this mode may not be the coherent acoustic phonon response in Co 2 FeAl/GaAs heterostructure.…”

Section: Resultsmentioning

confidence: 99%

Resonant enhancement of magnetic damping driven by coherent acoustic phonons in thin Co₂FeAl film epitaxied on GaAs

Song¹,

Yan²,

Wang³

et al. 2021

J. Semicond.

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The magnetic dynamics of a thin Co2FeAl film epitaxially grown on GaAs substrate was investigated using the time- resolved magneto-optical Kerr measurement under an out-of-plane external field. The intrinsic magnetic damping constant, which should do not vary with the external magnetic field, exhibits an abnormal huge increase when the precession frequency is tuned to be resonant with that of the coherent longitudinal acoustic phonon in the Co2FeAl/GaAs heterostructure. The experimental finding is suggested to result from the strong coherent energy transfer from spins to acoustic phonons via magnetoelastic effect under a resonant coupling condition, which leads to a huge energy dissipation of spins and a greatly enhanced magnetic damping in Co2FeAl. Our experimental findings provide an experimental evidence of spin pumping-like effect driven by propagating acoustic phonons via magnetoelastic effect, suggesting an alternative approach to the possible long-range spin manipulation via coherent acoustic waves.

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Section: Resultsmentioning

confidence: 99%

Resonant enhancement of magnetic damping driven by coherent acoustic phonons in thin Co₂FeAl film epitaxied on GaAs

Song¹,

Yan²,

Wang³

et al. 2021

J. Semicond.

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“…The landmark is probably the seminal paper of Kittel [75], who explained the benefits of coupling acoustic-waves (AW) with spin-waves (SW) in order to confer to the former waveform a tunable and non-reciprocal character. Since then, the subject has accumulated a vast amount of literature that spans a wide range of ferromagnetic materials from metals [108], to magnetic semiconductors [109,110], and electrical insulators [111,112,113]. From the start, ferrite garnets [114] have been the subject of an intense focus because of their ultra-low internal frictions.…”

Section: Magneto-elastic Couplingmentioning

confidence: 99%

Spin Insulatronics

Brataas,

van Wees,

Klein

et al. 2020

Preprint

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Spin insulatronics covers efforts to generate, detect, control, and utilize high-fidelity pure spin currents and excitations inside magnetic insulators. Ultimately, the new findings may open doors for pure spin-based information and communication technologies. The aim is to replace moving charges with dynamical entities that utilize low-dissipation coherent and incoherent spin excitations in antiferromagnetic and ferromagnetic insulators. The ambition is that the new pure spin-based system will suffer reduced energy losses and operate at high frequencies. In magnetic insulators, there are no mobile charge carriers that can dissipate energy. Integration with conventional electronics is possible via interface exchange interactions and spinorbit couplings. In this way, the free electrons in the metals couple to the localized spins in the magnetic insulators. In turn, these links facilitate spin-transfer torques and spin-orbit torques across metal-insulator interfaces and the associated phenomena of spin-pumping and charge-pumping. The interface couplings also connect the electron motion inside the metals with the spin fluctuations inside the magnetic insulators. These features imply that the system can enable unprecedented control of correlations resulting from the electron-magnon interactions. We review recent developments to realize electric and thermal generation, manipulation, detection, and control of pure spin information in insulators.

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Hypersound excitation at 8.9 GHz by exploiting magnetic anisotropy in oriented nickel films

Li¹

1977

Phys. Stat. Sol. (a)

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Because of the strong temperature dependence of the anisotropy constants K1 and K2 in ferromagnetic single crystals of cubic symmetry the resonance field for excitation of hypersound by ferromagnetic resonance (FMR) can be lowered to values that even at zero magnetic field hypersound can be excited. FMR experiments at 8.9 GHz are reported with oriented nickel films on polished MgO crystals. The results show that it is possible to excite hypersound in cubic crystals at zero magnetic field, and no uniaxial thermal stress is needed. By this the choice of substrates is no longer restricted to crystals with anisotropic thermal expansion, i.e. to crystals with noncubic symmetry.

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Microwave Photon Generation by Thin Magnetic Films

Cited by 18 publications

References 8 publications

Resonant enhancement of magnetic damping driven by coherent acoustic phonons in thin Co₂FeAl film epitaxied on GaAs

Resonant enhancement of magnetic damping driven by coherent acoustic phonons in thin Co₂FeAl film epitaxied on GaAs

Spin Insulatronics

Hypersound excitation at 8.9 GHz by exploiting magnetic anisotropy in oriented nickel films

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Microwave Photon Generation by Thin Magnetic Films

Cited by 18 publications

References 8 publications

Resonant enhancement of magnetic damping driven by coherent acoustic phonons in thin Co2FeAl film epitaxied on GaAs

Resonant enhancement of magnetic damping driven by coherent acoustic phonons in thin Co2FeAl film epitaxied on GaAs

Spin Insulatronics

Hypersound excitation at 8.9 GHz by exploiting magnetic anisotropy in oriented nickel films

Contact Info

Product

Resources

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Resonant enhancement of magnetic damping driven by coherent acoustic phonons in thin Co₂FeAl film epitaxied on GaAs

Resonant enhancement of magnetic damping driven by coherent acoustic phonons in thin Co₂FeAl film epitaxied on GaAs