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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

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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 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.
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...
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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 Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

1.3K
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
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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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Two-Dimensional Intercalating Multiferroics with Strong Magnetoelectric Coupling.

Hou-Yi Lyu1, Zhen Zhang2,3, Jing-Yang You4

  • 1Center of Materials Science and Optoelectronics Engineering, College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences, Beijing100049, China.

The Journal of Physical Chemistry Letters
|December 2, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed novel two-dimensional (2D) multiferroics by intercalating metal atoms into bilayer CrI3. This breakthrough enables strong coupling between magnetism and electricity, paving the way for advanced spintronic devices.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) multiferroics, materials exhibiting coupled ferromagnetism and ferroelectricity, are rare and highly sought after.
  • Achieving intrinsic multiferroicity in 2D materials remains a significant challenge in condensed matter physics.

Purpose of the Study:

  • To engineer novel 2D multiferroic materials by utilizing intercalation technology.
  • To investigate the magnetic and electric properties of intercalated bilayer CrI3.
  • To explore the potential applications of these engineered materials in spintronics.

Main Methods:

  • Intercalation of metal atoms (Cu, Ag) into bilayer chromium triiodide (CrI3) to form new compounds like Cu(CrI3)4 and Ag(CrI3)4.
  • Experimental and theoretical analysis of crystal structure, symmetry breaking, electric polarization, and magnetic coupling.
  • Characterization of magnetoelectric coupling coefficients.

Main Results:

  • Successful synthesis of 2D multiferroics Cu(CrI3)4 and Ag(CrI3)4.
  • Demonstration of broken inversion symmetry leading to significant out-of-plane electric polarization with low switching energy.
  • Observation of a transition from antiferromagnetic to ferromagnetic interlayer coupling and enhanced intralayer ferromagnetism due to charge transfer.
  • Significant magnetoelectric coupling achieved, exceeding that of Fe, Co, and Ni thin films.

Conclusions:

  • Intercalation is a viable and powerful method for creating 2D multiferroics.
  • The engineered materials exhibit robust ferroelectric and ferromagnetic properties with strong magnetoelectric coupling.
  • These findings offer a practical route towards next-generation spintronic devices.