Related Experiment Video
Updated: Aug 10, 2025
06:27
Fabrication of Magnetic Nanostructures on Silicon Nitride Membranes for Magnetic Vortex Studies Using Transmission Microscopy Techniques
Published on: July 2, 2018
8.2K
Nutation Excitations in the Gyrotropic Vortex Dynamics in a Circular Magnetic Nanodot
Zukhra Gareeva1,2, Konstantin Guslienko3,4,5
1Institute of Molecule and Crystal Physics, Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, 450075 Ufa, Russia.
Nanomaterials (Basel, Switzerland)
|February 11, 2023
Summary
This study reveals how high-frequency nutations impact magnetic vortex core motion in nanomaterials. Nutations induce an opposite motion direction and a terahertz-scale dynamic mass, distinct from gigahertz gyrotropic motion.
Area of Science:
- * Condensed matter physics
- * Nanomagnetism
- * Ultrafast spin dynamics
Background:
- * Understanding ultrafast spin dynamics in nanomaterials at pico- and femtosecond timescales is crucial but challenging.
- * Investigating gyrotropic vortex dynamics is key to advancing magnetic storage and spintronic devices.
Purpose of the Study:
- * To explore the influence of nutations on gyrotropic vortex dynamics in soft magnetic nanodots.
- * To analyze the dynamic response of vortex core motion to in-plane oscillating magnetic fields.
Main Methods:
- * Utilized a modified Thiele equation incorporating a nutation term for vortex core motion analysis.
- * Simulated the dynamic response of a circular soft magnetic nanodot to oscillating magnetic fields.
Main Results:
- * Demonstrated that nutations alter the vortex core trajectory, with opposite motion directions for gyrotropic and nutational modes.
- * Identified distinct resonant frequencies: gigahertz for gyrotropic motion and terahertz for nutations.
- * Showed that nutations induce a dynamic vortex mass, providing estimates and comparisons with other mass contributions.
Conclusions:
- * Nutational effects are significant in high-frequency spin excitation spectra of magnetic nanodots.
- * The concept of dynamic vortex mass induced by nutations offers new insights into spin dynamics.
- * Findings contribute to the fundamental understanding of ultrafast spin dynamics in magnetic nanomaterials.
Related Concept Videos
01:23Atomic Nuclei: Nuclear Relaxation Processes
697
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.
697
01:23Magnetic Field due to Moving Charges
9.0K
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...
9.0K
01:11Atomic Nuclei: Larmor Precession Frequency
1.6K
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,...
1.6K
00:59Atomic Nuclei: Nuclear Magnetic Moment
1.3K
All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
1.3K
01:13Torque On A Current Loop In A Magnetic Field
4.4K
The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
4.4K
01:22Motion Of A Charged Particle In A Magnetic Field
5.0K
A charged particle experiences a force when moving through a magnetic field. Consider the field to be uniform and the charged particle to move perpendicular to it. If the field is in a vacuum, the magnetic field is the dominant factor determining the motion. Since the magnetic force is perpendicular to the direction of motion, a charged particle follows a curved path. The particle continues to follow this curved path until it forms a complete circle. Another way to look at this is that the...
5.0K