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Related Concept Videos

Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

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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.
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Magnetic Field Due to Two Straight Wires01:18

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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.
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Magnetic Field Due To A Thin Straight Wire01:28

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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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A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
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Diamagnetism

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
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Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

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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.
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Related Experiment Video

Updated: Oct 12, 2025

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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Light helicity detector based on 2D magnetic semiconductor CrI3.

Xing Cheng1,2, Zhixuan Cheng1,2, Cong Wang3

  • 1State Key Lab for Artificial Microstructure & Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics, School of Physics, Peking University, Beijing, 100871, China.

Nature Communications
|November 26, 2021
PubMed
Summary
This summary is machine-generated.

Graphene-CrI3 heterostructures function as helicity detectors, showing magnetic state-dependent light responses. Researchers observed unusual negative photocurrents, revealing insights into CrI3

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spintronics

Background:

  • Two-dimensional (2D) magnetic semiconductors offer unique physical phenomena at the atomic scale.
  • They hold promise for advanced magneto-optoelectronic device applications.

Purpose of the Study:

  • To develop and investigate light helicity detectors utilizing graphene-CrI3-graphene van der Waals (vdW) heterostructures.
  • To explore the interplay between magnetic and optoelectronic properties in CrI3.

Main Methods:

  • Fabrication of graphene-CrI3-graphene vdW heterostructures.
  • Measurement of circularly polarized light-excited current and reflective magnetic circular dichroism (RMCD).
  • Investigation under varying magnetic fields in both monolayer and multilayer CrI3 devices.

Main Results:

  • Devices demonstrated clear helicity-selective photoresponse, dictated by the magnetic state of CrI3.
  • Abnormal negative photocurrents were observed at higher bias in both monolayer and multilayer CrI3.
  • A potential explanation for the negative photocurrent phenomenon was proposed.

Conclusions:

  • The study reveals the intricate relationship between magnetic and optoelectronic properties in CrI3.
  • These findings pave the way for the development of novel spin-optoelectronic devices.