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Related Concept Videos

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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Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
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Motional Emf01:22

Motional Emf

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Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into 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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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 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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Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons
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Magnetoelectric nanoparticles shape modulates their electrical output.

A Marrella1, G Suarato1, S Fiocchi1

  • 1Cnr-Istituto di Elettronica e di Ingegneria dell'Informazione e delle Telecomunicazioni, Milano, Italy.

Frontiers in Bioengineering and Biotechnology
|September 11, 2023
PubMed
Summary
This summary is machine-generated.

Elongated core-shell magnetoelectric nanoparticles (MENPs) show enhanced magnetoelectric coupling (αME) compared to spherical ones. This is due to increased interface area and optimal orientation, improving nanostructure design.

Keywords:
core-shell structureselectroporationferromagnetic materialsmagnetoelectric nanoparticlesnervous system stimulationpiezoelectric materialswireless stimulation

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physics

Background:

  • Core-shell magnetoelectric nanoparticles (MENPs) offer tunable magnetoelectric effects.
  • Understanding the influence of nanoparticle shape on magnetoelectric coupling is crucial for device applications.

Purpose of the Study:

  • To investigate the magnetoelectric behavior of core-shell MENPs with varying shapes.
  • To determine the magnetoelectric coupling coefficient (αME) using finite element analysis.
  • To elucidate the relationship between MENP geometry and magnetoelectric performance.

Main Methods:

  • Finite element analysis (FEA) was employed to simulate MENPs.
  • Simulations considered both static (DC) and time-variant (AC) magnetic fields.
  • The magnetoelectric coupling coefficient (αME) was calculated for different nanoparticle morphologies.

Main Results:

  • Elongated MENPs demonstrated a superior magnetoelectric coupling coefficient (αME) compared to spherical counterparts.
  • This enhancement is attributed to a larger interfacial surface area and favorable geometrical orientation.
  • The findings were consistent under both DC and AC magnetic field conditions.

Conclusions:

  • Nanoparticle morphology significantly impacts magnetoelectric performance.
  • High-aspect ratio MENPs are promising for enhanced magnetoelectric applications.
  • This study provides insights for designing advanced magnetoelectric nanostructures.