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Related Concept Videos

Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

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...
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...
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...
Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.

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Related Experiment Video

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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

Magnetic nano-oscillator driven by pure spin current.

Vladislav E Demidov1, Sergei Urazhdin, Henning Ulrichs

  • 1Institute for Applied Physics and Center for Nonlinear Science, University of Muenster, 48149 Muenster, Germany. demidov@uni-muenster.de

Nature Materials
|October 16, 2012
PubMed
Summary

Researchers generated coherent auto-oscillations using pure spin currents in spintronic devices. Enhanced spin-wave radiation losses unexpectedly enabled this, paving the way for tunable nanoscale microwave sources.

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Area of Science:

  • Spintronics
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Pure spin currents enable spintronic devices without charge transfer, offering applications in noise suppression and damping reduction.
  • Previous research has not achieved coherent auto-oscillations using pure spin currents.

Purpose of the Study:

  • To demonstrate the generation of single-mode coherent auto-oscillations using pure spin currents.
  • To explore the role of enhanced spin-wave radiation losses in enabling auto-oscillations.

Main Methods:

  • Fabrication of a device combining local pure spin current injection with enhanced spin-wave radiation losses.
  • Experimental investigation of auto-oscillation generation and frequency tunability.

Main Results:

  • Successful generation of single-mode coherent auto-oscillations at moderate current densities.
  • Demonstration that enhanced radiation losses suppress nonlinearities, enabling auto-oscillation.
  • Achieved wide-range tunability of the microwave frequency.

Conclusions:

  • Pure spin currents can generate coherent auto-oscillations, contrary to previous assumptions.
  • Enhanced spin-wave radiation losses are key to overcoming nonlinear limitations.
  • This work presents a novel approach for developing tunable nanoscale microwave sources for integrated electronics.