Related Experiment Video
Updated: Jul 17, 2025
08:01
Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
7.2K
Topological magneto-optical effect from skyrmion lattice
Yoshihiro D Kato1, Yoshihiro Okamura2, Max Hirschberger1,3
1Department of Applied Physics and Quantum Phase Electronics Center, University of Tokyo, Tokyo, 113-8656, Japan.
Nature Communications
|September 5, 2023
Summary
Researchers discovered topological magneto-optical Kerr effect (MOKE) in magnetic skyrmions. This finding reveals a new light-skyrmion interaction, crucial for advancing spintronic and photonic technologies.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Magnetic skyrmions are topologically nontrivial spin structures with potential for advanced spintronic devices.
- Optical readout is critical for high-integration and ultrafast spintronic devices, but skyrmion optical responses are not well understood.
Purpose of the Study:
- To investigate and demonstrate the magneto-optical Kerr effect (MOKE) associated with magnetic skyrmion formation.
- To explore the light-skyrmion interaction driven by emergent gauge fields in topological spin textures.
Main Methods:
- Experimental observation of the magneto-optical Kerr effect in Gd2PdSi3.
- Analysis of the enhanced optical rotation within the skyrmion phase.
- Theoretical exploration of emergent gauge fields and their impact on electronic band structure.
Main Results:
- Demonstration of topological MOKE induced by skyrmion formation in Gd2PdSi3.
- Significant enhancement of optical rotation in the skyrmion phase, confirming topological MOKE.
- Emergent gauge field in momentum space reconstructs electronic bands, leading to sub-eV magneto-optical activity.
Conclusions:
- The study establishes a direct link between magnetic skyrmions and topological MOKE.
- The findings highlight a novel light-skyrmion interaction mediated by emergent gauge fields.
- This work provides a foundation for developing photonic technologies based on skyrmionics.
More Related Videos
Related Concept Videos
01:23Magnetic Field due to Moving Charges
8.8K
A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
8.8K
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
01:19Magnetic Field Lines
4.2K
The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
Magnetic field lines follow several hard-and-fast rules:
4.2K
01:28Magnetic Field Due To A Thin Straight Wire
4.9K
Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
4.9K
01:05Atomic Nuclei: Magnetic Resonance
682
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...
682
01:15Magnetic Vector Potential
685
In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
Consider an ideal solenoid with n turns per unit length and radius R. If I is the current through the solenoid, the magnetic field inside the solenoid is expressed as the product of vacuum...
Consider an ideal solenoid with n turns per unit length and radius R. If I is the current through the solenoid, the magnetic field inside the solenoid is expressed as the product of vacuum...
685