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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

7.7K
A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
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Ferromagnetism01:31

Ferromagnetism

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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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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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Related Experiment Video

Updated: Mar 18, 2026

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates

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Local Magnetoelectric Effect in La-Doped BiFeO3 Multiferroic Thin Films Revealed by Magnetic-Field-Assisted Scanning

Dan-Feng Pan1, Ming-Xiu Zhou1, Zeng-Xing Lu1

  • 1National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, 210093, China.

Nanoscale Research Letters
|July 1, 2016
PubMed
Summary

Researchers studied La-doped BiFeO3 thin films, finding an optimized magnetic field (~40 Oe) maximizes ferroelectric polarization. This reveals the origin of local magnetoresistance, crucial for understanding multiferroic materials.

Keywords:
La-doped BiFeO3 thin filmLocal conductivityMagnetoelectric couplingMultiferroicityScanning probe microscopy

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Multiferroic materials exhibit coupled ferroelectric and magnetic orders.
  • Lanthanum-doped Bismuth Ferrite (La-doped BiFeO3) is a promising multiferroic thin film.

Purpose of the Study:

  • To investigate local magnetoelectric coupling in La-doped BiFeO3 thin films.
  • To understand the origin of local magnetoresistance in these multiferroic systems.

Main Methods:

  • Preparation of La-doped BiFeO3 thin films using a sol-gel plus spin-coating process.
  • Investigation of local magnetoelectric coupling via magnetic-field-assisted scanning probe microscopy (MFM-SPM) coupled with a ferroelectric analyzer.
  • Magnetic-field-dependent surface conductivity measurements.

Main Results:

  • Observed local ferroelectric polarization response to external magnetic fields.
  • Identified an optimized magnetic field of approximately 40 Oe for maximum ferroelectric polarization.
  • Illustrated the origin of local magnetoresistance, linking it to ferroelectric polarization response.

Conclusions:

  • The study provides a valuable technique for characterizing local magnetoelectric coupling in multiferroics.
  • Offers deeper insights into the local multiferroic behaviors of BiFeO3-based systems.
  • Highlights the interplay between ferroelectric polarization and magnetoresistance in La-doped BiFeO3.