Anomalous temperature dependence of phonon pumping by ferromagnetic resonance in Co/Pd multilayers with perpendicular anisotropy

Peria, W. K.; Zhang, Delin; Fan, Yi‐Ming; Wang, Jianping; Crowell, Paul

doi:10.1103/physrevb.106.l060405

Cited by 4 publications

(2 citation statements)

References 29 publications

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“…This could enable the transfer or storage of angular momentum as well as the conversion between circularly polarized and linearly polarized shear waves, allowing for the realization of phononic spin valves [22,23]. Magnons, the quantized excitations of magnets, are ideal sources of phonons with a defined chirality, as they couple to phonons via the spin-orbit interaction whereas the sense of the magnetic precession is determined by the sign of the gyromagnetic ratio [22][23][24][25][26][27][28][29][30][31][32][33]. Regarding suitable material platforms, bulk acoustic resonators with high quality factors combined with magnetic materials with low magnon damping and strong spin-orbit interaction are promising for the realization of magnonphonon hybrids.…”

Section: Introductionmentioning

confidence: 99%

Chiral phonons and phononic birefringence in ferromagnetic metal–bulk acoustic resonator hybrids

Müller,

Weber,

Engelhardt

et al. 2024

Phys. Rev. B

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Magnomechanical devices, in which magnetic excitations couple to mechanical vibrations, have been discussed as efficient and broadband microwave signal transducers in the classical and quantum limit. We experimentally investigate the resonant magnetoelastic coupling between the ferromagnetic resonance modes in metallic Co 25 Fe 75 thin films, featuring ultralow magnetic damping as well as sizable magnetostriction, and standing transverse elastic phonon modes in sapphire, silicon, and gadolinium gallium garnet at cryogenic temperatures. For all substrates, we observe a coherent interaction between the acoustic and magnetic modes. We identify the phonon modes as transverse shear waves propagating with slightly different velocities ( v/v 10 −5 ); i.e., all investigated substrates show potential for phononic birefringence as well as phonon-mediated angular momentum transport. Our magnon-phonon hybrid systems operate in a coupling regime analogous to the Purcell enhanced damping in cavity magnonics.

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Section: Introductionmentioning

confidence: 99%

Chiral phonons and phononic birefringence in ferromagnetic metal–bulk acoustic resonator hybrids

Müller,

Weber,

Engelhardt

et al. 2024

Phys. Rev. B

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“…To this end, the intrinsic chirality of a magnetic resonance mode such as the Kittel mode in combination with the magnetoelastic interaction represents a promising approach for detecting and driving such phonons [24][25][26][27]. Magnetic materials combined with BAW resonators, which provide long-lived excitations at high overtone frequencies, are therefore an ideal testbed to study the excitation of phonons with angular momentum [22,23,[28][29][30][31][32][33]. While in early experiments [22,23,28] the ultra-low magnetization damping material yttrium iron garnet (Y 3 Fe 5 O 12 , YIG) grown lattice matched on gadolinium gallium garnet (Gd 3 Ga 5 O 12 , GGG) substrates is used, the following aspects remained unaddressed: (i) What requirements must the phonon dispersion relations of a given crystalline symmetry fulfill to allow for the transport of angular momentum or the conversion of chiral to linear polarized phonons and vice versa?…”

mentioning

confidence: 99%

Chiral phonons and phononic birefringence in ferromagnetic metal - bulk acoustic resonator hybrids

Müller¹,

Weber²,

Engelhardt³

et al. 2023

Preprint

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Magnomechanical devices, in which magnetic excitations couple to mechanical vibrations, have been discussed as efficient and broadband microwave signal transducers in the classical and quantum limit. We experimentally investigate the magnetoelastic coupling between the ferromagnetic resonance (FMR) modes in a metallic Co 25 Fe 75 thin film, featuring ultra-low magnetic damping as well as sizable magnetostriction, and standing transverse elastic phonon modes in sapphire, silicon and gadolinium gallium garnet by performing broadband FMR spectroscopy at cryogenic temperatures. For all these substrate materials, we observe an interaction between the resonant acoustic and magnetic modes, which can be tailored by the propagation direction of the acoustic mode with respect to the crystallographic axes. We identify these phonon modes as transverse shear waves propagating with slightly different velocities with relative magnitudes of ∆v/v 10 −5 , i.e., all substrates show phononic birefringence. Upon appropriately choosing the phononic mode, the hybrid magnomechanical system enters the Purcell enhanced coupling regime.

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Interlayer coupling of the Kittel mode and the perpendicular standing spin wave in magnetic multilayers

Jalali,

Tang,

Guo

et al. 2024

Journal of Magnetism and Magnetic Materials

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Anomalous temperature dependence of phonon pumping by ferromagnetic resonance in Co/Pd multilayers with perpendicular anisotropy

Cited by 4 publications

References 29 publications

Chiral phonons and phononic birefringence in ferromagnetic metal–bulk acoustic resonator hybrids

Chiral phonons and phononic birefringence in ferromagnetic metal–bulk acoustic resonator hybrids

Chiral phonons and phononic birefringence in ferromagnetic metal - bulk acoustic resonator hybrids

Interlayer coupling of the Kittel mode and the perpendicular standing spin wave in magnetic multilayers

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