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Related Concept Videos

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 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.
Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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 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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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
05:39

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Coherent transport in high performance double magnetic junctions.

H G Silva1, Y G Pogorelov

  • 1IFIMUP Universidade do Porto, R. Campo Alegre, 687, Porto 4169-007, Portugal.

Journal of Nanoscience and Nanotechnology
|April 2, 2010
PubMed
Summary

This study explores spin-dependent transport in magnetic tunnel junctions. Optimized material and structural designs can significantly enhance tunnel magnetoresistance (TMR) performance in advanced devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Double magnetic tunnel junctions (MTJs) are crucial for spintronic devices.
  • Understanding spin-dependent transport is key to improving MTJ performance.

Purpose of the Study:

  • To investigate spin-dependent transport in F-I-F-I-F and F-I-N-I-F MTJs.
  • To determine how material properties and layer structures affect tunnel magnetoresistance (TMR).

Main Methods:

  • Utilized the Landauer formalism for theoretical analysis.
  • Employed single-band tight-binding dynamics for atomically perfect multilayers.

Main Results:

  • Identified dependencies of TMR on on-site energies (epsilonN) and layer thickness (nI).
  • Found maximum TMR in the "shallow band" regime for non-magnetic layers.
  • Observed a series of TMR peaks with respect to the number of atomic planes (nI).

Conclusions:

  • The findings suggest specific material and structural choices for optimizing TMR devices.
  • Enhanced performance is achievable compared to simple F-I-F junctions.
  • Provides insights for designing advanced MTJ compositions.