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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

7.1K
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...
7.1K
Diamagnetism01:26

Diamagnetism

2.9K
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 Force01:18

Magnetic Force

1.8K
In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
The magnetic force acting on a moving charge...
1.8K
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...
2.9K
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

740
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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Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

4.4K
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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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
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Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains

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Indirect magnetic force microscopy.

Joshua Sifford1, Kevin J Walsh2, Sheng Tong3

  • 1Department of Mechanical Engineering, The Ohio State University, Columbus, OH 43210, USA.

Nanoscale Advances
|October 15, 2019
PubMed
Summary
This summary is machine-generated.

A new indirect magnetic force microscopy (ID-MFM) technique overcomes limitations of conventional MFM. ID-MFM enables multimodal imaging and analysis of magnetic nanoparticles and biological samples.

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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biophysics

Background:

  • Conventional magnetic force microscopy (MFM) is crucial for characterizing magnetic materials but has limitations.
  • These limitations include the need for multiple scans, susceptibility to artifacts, and restricted multimodal or fluid imaging capabilities.
  • Existing MFM methods struggle with analyzing magnetic properties in biological samples and nanoparticles.

Purpose of the Study:

  • To introduce indirect magnetic force microscopy (ID-MFM) as an advanced imaging modality.
  • To demonstrate the feasibility of ID-MFM using readily available equipment and materials.
  • To highlight ID-MFM's potential for multimodal imaging and biological sample analysis.

Main Methods:

  • Developed ID-MFM by incorporating an ultrathin barrier between the MFM probe and the sample.
  • Utilized fluorescently conjugated superparamagnetic nanoparticles for magnetic signal detection.
  • Employed commercially available silicon nitride windows, MFM probes, and atomic force microscopy (AFM) instrumentation.

Main Results:

  • Achieved MFM signal quality comparable to conventional MFM.
  • Demonstrated successful ID-MFM implementation with standard AFM equipment.
  • Confirmed sample compatibility with multimodal imaging, including fluorescence and transmission electron microscopy (TEM).

Conclusions:

  • ID-MFM offers a high-throughput, multimodal microscopy solution.
  • This technique is particularly advantageous for detecting magnetism in nanoparticles and biological samples.
  • ID-MFM enhances the capabilities of magnetic domain imaging, especially in complex environments.