Theory of the magnon Kerr effect in cavity magnonics

Zhang, Guo-Qiang; Wang, Yipu; You, J. Q.

doi:10.1007/s11433-018-9344-8

Cited by 89 publications

(65 citation statements)

References 62 publications

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“…Studies of magnons (or their classical siblings, spin waves) began approximately 90 years ago. Interest in magnonic properties has surged in recent years because magnons are fundamentally important for understanding magnetic phase transitions and for developing applications [4][5][6][7][8]. The magnonic spectrum of a given material depends on the exchange interaction in the material, which is affected by interior and external factors such as shifted atomic positions and the presence of an electric field.…”

Section: Introductionmentioning

confidence: 99%

Strong phonon-magnon coupling of an O/Fe(001) surface

Zhu

Pan

Fan

et al. 2020

Sci. China Phys. Mech. Astron.

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Using density functional calculations, we elucidate the interaction between magnons and phonons on Fe(001) and O/Fe(001) surfaces. The effective Heisenberg exchange parameters between neighbor sites (J i ) were derived by fitting the ab initio spin spiral dispersion relation to a classical Heisenberg model. In bulk Fe, J 5b has a larger amplitude than J 2b -J 4b . Surface magnons were softer on the Fe(001) surface than in bulk, but were strengthened on the O/Fe(001) surface through strong interactions between the O and Fe atoms. The four calculated high-energy phonon modes of O/Fe(001) excellently agreed with the experimental measurements. The J 1 in O/Fe(001) decreased significantly with increasing phonon amplitude. Phonon-magnon coupling occurred more easily on O/Fe(001) than on Fe(001). The softening of the magnon on the O/Fe(001) with phonon amplitude was attributed to the reduced amplitude of longitudinal excitations. Magnetic moment of the Fe atom of the second layer (Fe2) was especially sensitive to phonon amplitude, regardless of the motion direction of the Fe2 atoms.

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Section: Introductionmentioning

confidence: 99%

Strong phonon-magnon coupling of an O/Fe(001) surface

Zhu

Pan

Fan

et al. 2020

Sci. China Phys. Mech. Astron.

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“…The magnetocrystalline anisotropy energy measures the energy cost when tuning the magnetization orientation from the easy axis to the hard axis. Mathematically, the energy term is proportional to S 2 z (S z is the macrospin operator) and a self-Kerr term K s m † mm † m can be obtained, where K s is the Kerr coefficient and m † (m) is the creation (annihilation) operator of the magnon mode [60,61]. When the magnon mode is pumped to generate a certain number of excitations, the precession angle of the magnetization increases.…”

Section: System and Theoretical Modelmentioning

confidence: 99%

“…A large frequency detuning between these two modes is found. When the Kittel mode or HMS mode is pumped to generate a certain number of magnon excitations, the pumped mode gains a frequency shift due to the self-Kerr effect [40,[60][61][62][63][64][65]. Meanwhile, the frequency of the undriven mode also shifts due to the cross-Kerr effect between these two modes.…”

Section: Introductionmentioning

confidence: 99%

Observation of magnon cross-Kerr effect in cavity magnonics

Wu¹,

Xu²,

Qian³

et al. 2021

Preprint

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When there is a certain amount of field inhomogeneity, the biased ferrimagnetic crystal will exhibit the higher-order magnetostatic (HMS) mode in addition to the uniform-precession Kittel mode. In cavity magnonics, we show both experimentally and theoretically the cross-Kerr-type interaction between the Kittel mode and HMS mode. When the Kittel mode is driven to generate a certain number of excitations, the HMS mode displays a corresponding frequency shift, and vice versa. The cross-Kerr effect is caused by an exchange interaction between these two spin-wave modes. Utilizing the cross-Kerr effect, we realize and integrate a multi-mode cavity magnonic system with only one yttrium iron garnet (YIG) sphere. Our results will bring new methods to magnetization dynamics studies and pave a way for novel cavity magnonic devices by including the magnetostatic mode-mode interaction as an operational degree of freedom.

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“…We thus focus on the controllability of pathway interferences through the phase difference between the cavity-probe tone and the magnon-pump tone, which is introduced by the coupling loops' technology [61][62][63][64]. The direct magnon pump is becoming useful in realizing the light-wave interface [46][47][48], enhancing the Kerr nonlinearity [65][66][67], and has also been adopted to observe the magnetostrictioninduced quantum entanglement [68][69][70][71][72], among other applications.…”

Section: Introductionmentioning

confidence: 99%

Phase-Controlled Pathway Interferences and Switchable Fast-Slow Light in a Cavity-Magnon Polariton System

Jie

et al. 2021

Phys. Rev. Applied

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We study the phase-controlled transmission properties in a compound system consisting of a threedimensional copper cavity and an yttrium-iron-garnet (YIG) sphere. By tuning the relative phase of the magnon pumping and cavity-probe tones, constructive and destructive interferences occur periodically, which strongly modify both the cavity-field transmission spectra and the group delay of light. Moreover, the tunable amplitude ratio between pump-probe tones allows us to further improve the signal absorption or amplification, accompanied by either significantly enhanced optical advance or delay. Both the phase and amplitude ratio can be used to realize in situ tunable and switchable fast-slow light. The tunable phase and amplitude ratio lead to the zero reflection of the transmitted light and an abrupt fast-slow light transition. Our results confirm that direct magnon pumping through the coupling loops provides a versatile route to achieve controllable signal transmission, storage, and communication, which can be further expanded to the quantum regime, realizing coherent-state processing or quantum-limited precise measurements.

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Theory of the magnon Kerr effect in cavity magnonics

Cited by 89 publications

References 62 publications

Strong phonon-magnon coupling of an O/Fe(001) surface

Strong phonon-magnon coupling of an O/Fe(001) surface

Observation of magnon cross-Kerr effect in cavity magnonics

Phase-Controlled Pathway Interferences and Switchable Fast-Slow Light in a Cavity-Magnon Polariton System

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