Related Experiment Video
Updated: May 31, 2026
08:01
Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
The vectorial control of magnetization by light
Natsuki Kanda1, Takuya Higuchi, Hirokatsu Shimizu
1Department of Applied Physics, The University of Tokyo and Core Research for Evolutional Science and Technology, Tokyo 113-8656, Japan.
Nature Communications
|June 23, 2011
Summary
Researchers demonstrated full vectorial control of magnetization dynamics in antiferromagnetic nickel oxide (NiO) using tailored laser pulses. This breakthrough enables precise manipulation of magnetic oscillations along designed multidimensional trajectories.
Area of Science:
- Optics and Photonics
- Condensed Matter Physics
- Materials Science
Background:
- Coherent light-matter interactions are increasingly used for ultrafast magnetization control.
- Precisely controlling multidimensional magnetic trajectories remains an unrealized goal.
Purpose of the Study:
- To demonstrate full manipulation of two-dimensional magnetic oscillations in antiferromagnetic NiO.
- To achieve vectorial control of magnetization using tailored laser pulses.
Main Methods:
- Utilizing a pair of polarization-twisted femtosecond laser pulses.
- Employing Raman-type nonlinear optical processes to induce magnetic oscillations with controlled initial phase.
- Leveraging material symmetries to dictate azimuthal angle selection rules.
Main Results:
- Achieved full manipulation of two-dimensional magnetic oscillations in antiferromagnetic NiO.
- Demonstrated independent control over the phase and amplitude of two degenerate magnetic modes by varying laser pulse polarization over time.
- Established well-defined selection rules for magnetic oscillation control based on material symmetries.
Conclusions:
- Introduced a novel concept for vectorial control of magnetization using light.
- Paved the way for arbitrary multidimensional trajectory design in magnetic systems.
- Opened new avenues for ultrafast magnetic control and information processing.
Related Concept Videos
01:24Potential Due to a Magnetized Object
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
The vector...
01:15Magnetic Vector Potential
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...
01:27Magnetic Fields
A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
A magnetic field is defined by the force that a charged particle experiences...
01:05Atomic Nuclei: Magnetic Resonance
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...
01:23Atomic Nuclei: Nuclear Relaxation Processes
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. This...
01:30Magnetism
Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...