Related Experiment Video
Updated: Mar 18, 2026
07:42
Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
Published on: July 20, 2022
3.5K
Ultrafast Laser-Driven Asymmetric Demagnetization Dynamics in d-Wave Altermagnets
1School of Physics, State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 611731, China.
The Journal of Physical Chemistry Letters
|March 16, 2026
Summary
Altermagnets exhibit ultrafast spin manipulation. Laser polarization selectively excites spin transfer in V2Se2O crystals, generating net magnetization, with lower dimensionality enhancing this effect for spintronic applications.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Mechanics
Background:
- Altermagnetism (AM) is an unconventional spin-ordered phase offering potential for ultrafast spin manipulation.
- Understanding laser-driven spin dynamics in low-dimensional altermagnets is crucial but remains unclear.
Purpose of the Study:
- Investigate laser-induced spin dynamics in d-wave altermagnetic V2Se2O crystals.
- Explore the influence of dimensionality and K-intercalation on spin dynamics.
Main Methods:
- Utilized real-time time-dependent density functional theory (RT-TDDFT).
- Analyzed laser polarization effects on momentum-dependent spin transfer.
- Compared K-intercalated and deintercalated V2Se2O systems.
Main Results:
- Laser polarization selectively excites momentum-dependent spin transfer in V2Se2O.
- Anisotropic optical intersite spin transfer generates transient net magnetization.
- Deintercalated and monolayer V2Se2O show significantly larger laser-induced magnetization than K-intercalated bulk.
Conclusions:
- Dimensionality and K-intercalation are key factors in tailoring ultrafast spin responses.
- Altermagnets like V2Se2O are promising for ultrafast spintronic applications.
- K-intercalation suppresses spin-relaxation channels, enhancing laser-induced magnetization.
Related Concept Videos
01:26Diamagnetism
3.3K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
3.3K
01:31Ferromagnetism
3.4K
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...
3.4K
01:23Atomic Nuclei: Nuclear Relaxation Processes
1.3K
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis.
1.3K
01:30Paramagnetism
3.2K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
3.2K
01:05Atomic Nuclei: Magnetic Resonance
1.4K
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...
1.4K
01:17Magnetic Damping
1.2K
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
1.2K