Related Experiment Video
Updated: Jul 10, 2025
08:01
Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
7.1K
Acoustically Driven Magnon-Phonon Coupling in a Layered Antiferromagnet.
Thomas P Lyons1, Jorge Puebla1, Kei Yamamoto1,2
1Center for Emergent Matter Science, RIKEN, Wako-shi, Saitama 351-0198, Japan.
Physical Review Letters
|November 24, 2023
Summary
We demonstrate acoustic control of spin waves in chromium trichloride, a Van der Waals material. This magnetoacoustic coupling shows high sensitivity to magnetic fields, paving the way for new sensors and memory devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Van der Waals materials offer unique mechanical and magnetic properties.
- Efficiently interfacing with magnetoelastic interactions is key for technological applications.
- Acoustic control of magnetic phenomena is an emerging field.
Purpose of the Study:
- To demonstrate acoustically driven spin-wave resonance in a Van der Waals material.
- To investigate the dependence of magnon-phonon coupling on temperature and magnetic field.
- To explore the potential for sensitive magnetic field detection.
Main Methods:
- Utilized surface acoustic waves to excite spin waves in chromium trichloride.
- Investigated the magnetoacoustic coupling under varying temperature and magnetic field conditions.
- Measured the sensitivity to magnetic anisotropy fields.
Main Results:
- Successfully demonstrated acoustically driven spin-wave resonance in chromium trichloride.
- Observed strong dependence of magnon-phonon coupling on temperature and magnetic field orientation.
- Showcased high sensitivity to magnetic anisotropy fields in the mT range.
Conclusions:
- Acoustic control of spin waves in Van der Waals materials is feasible.
- This magnetoacoustic coupling is tunable and highly sensitive.
- The findings support the development of power-efficient dynamic magnetoacoustic devices.
Related Concept Videos
01:08NMR Spectroscopy: Spin–Spin Coupling
1.4K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
1.4K
01:31Ferromagnetism
2.4K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.4K
01:27¹H NMR: Long-Range Coupling
1.8K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
1.8K
01:13¹H NMR Signal Multiplicity: Splitting Patterns
5.2K
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...
5.2K
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
1.0K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.0K
01:05Atomic Nuclei: Magnetic Resonance
664
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...
664