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Related Concept Videos

Magnetic Fields01:27

Magnetic 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...
Magnetic Flux01:18

Magnetic Flux

The magnetic flux measures the number of magnetic field lines passing through a given surface area. The SI unit for magnetic flux is the weber (Wb). Magnetic flux is a scalar quantity. It depends on three factors: the strength of the magnetic field B, the area through which the field lines pass, and the relative orientation of the field with the surface area.
Suppose a surface is divided into elements of area dA. For each element, the component of the magnetic field that is normal to the...
Magnetic Field due to Moving Charges01:23

Magnetic 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...
Ferromagnetism01:31

Ferromagnetism

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...
Force On A Current Loop In A Magnetic Field01:17

Force 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...
Motional Emf01:22

Motional Emf

Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the magnetic...

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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

Published on: July 20, 2022

Nonlinear nanodevices using magnetic flux quanta.

S Ooi1, Sergey Savel'ev, M B Gaifullin

  • 1National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki 305-0047, Japan.

Physical Review Letters
|February 1, 2008
PubMed
Summary

Researchers developed novel superconducting devices using Bi2Sr2CaCu2O8+delta for efficient magnetic flux quantum control. These devices rectify currents without spatial asymmetry, offering improved controllability for advanced applications.

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity
  • Materials Science

Background:

  • Existing devices for magnetic flux quantum control often rely on spatially asymmetric potentials, limiting controllability, or exhibit low efficiency with time-asymmetric magnetic fields.
  • Pristine superconductors have shown limited efficiency in rectifying magnetic flux quantum motion.

Purpose of the Study:

  • To design and simulate efficient nonlinear superconducting devices for controlling magnetic flux quantum motion.
  • To overcome the limitations of spatial asymmetry and low efficiency in current flux quantum control technologies.

Main Methods:

  • Fabrication of devices using layered Bi2Sr2CaCu2O8+delta materials.
  • Simulation of device performance under a two-harmonic external current.
  • Investigation of vortex dynamics influenced by relative phase and frequency ratio of harmonics.

Main Results:

  • Two efficient nonlinear superconducting devices with no spatial asymmetry were fabricated and simulated.
  • High-efficiency rectification of a two-harmonic external current was achieved, enabling controlled vortex motion.
  • Controllability was demonstrated by adjusting the relative phase or frequency ratio of the applied harmonics.

Conclusions:

  • The developed devices offer a novel and efficient approach to controlling magnetic flux quantum motion without spatial asymmetry.
  • These findings pave the way for improved superconducting devices with enhanced controllability for flux quantum manipulation.