Video Experimental Relacionado
Updated: Jun 5, 2026
09:43
Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
Published on: November 7, 2017
Dinámica de las paredes del dominio magnético bajo su propia inercia
Luc Thomas1, Rai Moriya, Charles Rettner
1IBM Almaden Research Center, 650 Harry Road, San Jose, CA, USA. lucthom@us.ibm.com
Science (New York, N.Y.)
|January 6, 2011
Resumen
Las paredes del dominio magnético se mueven largas distancias debido a la inercia después de que los pulsos actuales se detienen. El posicionamiento preciso se logra mediante la sincronización de pulsos de corriente, lo que permite un control preciso de los dispositivos de memoria magnética.
Área de la Ciencia:
- Spintronics es una empresa de Spintronics.
- Física de la materia condensada Física de la materia condensada
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- Las paredes del dominio magnético son cruciales para los dispositivos espintrónicos.
- El control preciso del movimiento de la pared del dominio es esencial para la memoria magnética y las aplicaciones lógicas.
- El movimiento de pared de dominio inducido por corriente es un área clave de investigación.
Objetivo del estudio:
- Para investigar la dinámica de movimiento de las paredes del dominio magnético después de la cesación de la corriente.
- Para determinar los factores que influyen en el desplazamiento y posicionamiento de la pared de dominio.
- Establecer un método para el posicionamiento preciso de paredes de dominio en nanocables magnéticos.
Principales métodos:
- Utilizando pulsos de corriente polarizados por espín para inducir el movimiento de la pared del dominio.
- Observando el movimiento de la pared del dominio y la dinámica de relajación.
- Analizando la relación entre la duración del pulso actual y el desplazamiento de la pared del dominio.
Principales resultados:
- Las paredes de dominio exhiben movimiento inercial, viajando micrómetros después de la eliminación de corriente.
- La relajación de la pared del dominio se produce en decenas de nanosegundos.
- El desplazamiento de la pared del dominio es directamente proporcional a la longitud del pulso actual debido al retraso de aceleración inicial.
Conclusiones:
- El movimiento de la pared del dominio está influenciado por la inercia y la dinámica de aceleración.
- El posicionamiento preciso de las paredes de dominio se puede lograr mediante el control del tiempo de pulso actual.
- Este hallazgo tiene implicaciones significativas para el desarrollo de dispositivos avanzados de memoria magnética y dispositivos lógicos.
Videos de Conceptos Relacionados
01:23Magnetic Field due to Moving Charges
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...
01:17Magnetic Damping
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...
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...
01:31Ferromagnetism
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...
01:17Force On A Current Loop In A Magnetic Field
Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
01:28Magnetostatic Boundary Conditions
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...