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Force On A Current Loop In A Magnetic Field

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 Of A Current Loop

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 Field

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...

Magnetic Field due to Moving Charges

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...

Ferromagnetism

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...

Magnetic Field Due To A Thin Straight Wire

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

Updated: Jun 26, 2026

Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

Chemical Vapor Deposition of an Organic Magnet, Vanadium Tetracyanoethylene

Published on: July 3, 2015

Spin-current rectification in an organic magnetic/nonmagnetic device.

Guichao Hu¹, Keliang He, Shijie Xie

¹School of Physics, Shandong University, Jinan 250100, China.

The Journal of Chemical Physics

|December 24, 2008

Summary

Researchers developed an organic spin diode capable of rectifying both charge and spin currents. This breakthrough in organic spintronics allows for independent or simultaneous control of current and spin polarization by reversing bias.

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Area of Science:

Organic spintronics
Molecular electronics
Condensed matter physics

Background:

Development of novel electronic devices based on spin properties of electrons.
Organic materials offer potential for low-cost, flexible spintronic devices.
Rectification phenomena in electronic devices are crucial for circuit design.

Purpose of the Study:

To propose and theoretically investigate a spin diode utilizing organic magnetic co-oligomers or magnetic/nonmagnetic heterojunctions.
To explore the rectification of both charge current and spin current (SC) in organic spin devices.
To understand the mechanisms and design principles for achieving specific rectification behaviors.

Main Methods:

Theoretical calculations using the spin-dependent Landauer-Büttiker formula.
Simulation of current and spin polarization in proposed device structures.
Analysis of the effects of bias reversal on charge and spin currents.

Main Results:

Demonstrated simultaneous or separate rectification of charge current and spin current (SC) by reversing applied bias.
Identified two distinct mechanisms for spin-current rectification: asymmetric SC magnitude and SC spin orientation flipping.
Showcased the ability to achieve either rectification type through careful device design.

Conclusions:

Organic spin diodes can be engineered to exhibit tunable rectification of both charge and spin currents.
The findings provide a pathway for designing advanced organic spintronic devices with tailored functionalities.
Device performance is influenced by organic interlayer properties and structural asymmetry.