Related Experiment Video
Updated: Jun 25, 2025
08:01
Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
7.1K
Asymmetric Magnon Frequency Comb
Xue Liang1,2, Yunshan Cao2, Peng Yan2
1School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, Guangdong 518172, China.
Nano Letters
|May 24, 2024
Summary
We demonstrate asymmetric spin wave transmission using a skyrmion nanocavity. This structure generates a unidirectional magnon frequency comb with over 50 teeth, advancing spintronic device research.
Area of Science:
- Spintronics
- Condensed Matter Physics
- Nonlinear Dynamics
Background:
- Spin waves, or magnons, are fundamental to information processing.
- Skyrmions are topologically protected spin textures with potential applications in data storage and logic.
- Controlling spin wave propagation and generating magnon-based signals are key challenges in spintronics.
Purpose of the Study:
- To theoretically investigate asymmetric spin wave transmission in a coupled waveguide-skyrmion system.
- To explore the generation of magnon frequency combs using skyrmion nanocavities.
- To establish a universal paradigm for asymmetric magnon frequency comb generation.
Main Methods:
- Theoretical modeling of spin wave propagation in a waveguide-skyrmion structure.
- Utilizing the skyrmion as an effective nanocavity for magnons.
- Employing two-tone excitations and analyzing nonlinear mixing within the skyrmion wall.
Main Results:
- Demonstrated asymmetric spin wave transmission due to the chiral nature of the skyrmion.
- Observed a unidirectional magnon frequency comb with a record number of teeth (>50).
- Showcased the skyrmion's whispering gallery modes for magnons.
Conclusions:
- The coupled waveguide-skyrmion structure is a universal platform for generating asymmetric magnon frequency combs.
- The findings enhance understanding of nonlinear magnon-texture interactions.
- This work opens new avenues for asymmetric spin wave transmission and magnon frequency comb control.
Related Concept Videos
01:11Atomic Nuclei: Larmor Precession Frequency
1.3K
The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
1.3K
01:13¹H NMR Signal Multiplicity: Splitting Patterns
5.1K
When protons A and X are coupled, their nuclear spin energy levels are slightly modified. This is because the energy required to excite proton A to a spin state parallel to proton X is slightly different from the energy required for it to become anti-parallel to spin X. Consequently, there are two possible excitation frequencies for A (A1 and A2), depending on the spin state of X, and vice versa. The mutual nature of coupling implies that the difference between frequencies A1 and A2, indicated...
5.1K
01:08IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations
1.0K
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
1.0K
01:28Symmetry in Maxwell's Equations
3.4K
Once the fields have been calculated using Maxwell's four equations, the Lorentz force equation gives the force that the fields exert on a charged particle moving with a certain velocity. The Lorentz force equation combines the force of the electric field and of the magnetic field on the moving charge. Maxwell's equations and the Lorentz force law together encompass all the laws of electricity and magnetism. The symmetry that Maxwell introduced into his mathematical framework may not be...
3.4K
01:30Electromagnetic Waves in Matter
3.0K
Electromagnetic waves can travel in the vacuum as well as in matter. For example light, which is an electromagnetic wave, can travel through air, water, or glass.
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the...
Consider the electromagnetic wave passing through a dielectric medium. In such a case, Maxwell's equations get modified. In Ampere's law, ε0 , the dielectric permittivity of free space is replaced with ε, the permittivity of dielectric. Also, the vacuum permeability μ0 is replaced by the permeability of the...
3.0K
01:05Atomic Nuclei: Magnetic Resonance
647
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
647