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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.4K
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...
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Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

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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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Diamagnetism01:26

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.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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Magnetic Field Due To A Thin Straight Wire01:28

Magnetic Field Due To A Thin Straight Wire

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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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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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Paramagnetism01:30

Paramagnetism

2.5K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Related Experiment Video

Updated: Jul 11, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Spin-Driven Ferroelectricity in Two-Dimensional Magnetic Heterostructures.

Huiping Li1,2, Wenguang Zhu1,2,3

  • 1International Center for Quantum Design of Functional Materials (ICQD), Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei 230026, China.

Nano Letters
|November 13, 2023
PubMed
Summary

Researchers demonstrated spin-driven ferroelectricity in a novel 2D van der Waals heterostructure. An external magnetic field can control the material's electric polarization, paving the way for advanced multiferroic devices.

Keywords:
exchange strictionmagnetic heterostructuresmagnetoelectric switchingtwo-dimensional multiferroelectrics

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Controlling ferroelectricity with magnetism and vice versa is challenging due to distinct origins and symmetry constraints.
  • Such control is highly desirable for advanced electronic and spintronic device applications.

Purpose of the Study:

  • To demonstrate spin-driven ferroelectricity in a designed two-dimensional (2D) van der Waals heterostructure.
  • To show that electric polarization can be magnetically controlled in such systems.

Main Methods:

  • Utilized first-principles density functional theory (DFT) calculations.
  • Designed and analyzed a vertically stacked 2D van der Waals heterostructure composed of ferromagnetic (FM) CrBr3 and antiferromagnetic (AFM) MnPSe3 layers.
  • Investigated structural and magnetic properties and their influence on electric polarization.

Main Results:

  • Demonstrated the emergence of spin-driven ferroelectricity in the designed FM/AFM/FM heterostructure.
  • Showed that the out-of-plane electric polarization is reversibly controlled by an external magnetic field.
  • Validated the design strategy in other lattice-matched FM/AFM/FM heterostructures.

Conclusions:

  • Successfully designed a novel 2D van der Waals heterostructure exhibiting magnetically controllable ferroelectricity.
  • Established a new family of 2D multiferroic materials with potential for device applications.
  • Highlighted the effectiveness of combining specific magnetic and structural properties in 2D materials for multiferroicity.