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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.
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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.
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Magnetic Force On A Current-Carrying Conductor01:25

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Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor carrying a current creates a magnetic field around it.
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Magnetic Force On Current-Carrying Wires: Example01:22

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In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
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Force On A Current Loop In A Magnetic Field01:17

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Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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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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Differential magnetic force microscope imaging.

Ying Wang1, Zuobin Wang, Jinyun Liu

  • 1Changchun University of Science and Technology, CNM & JR3CN, Changchun, China.

Scanning
|February 6, 2015
PubMed
Summary
This summary is machine-generated.

This study introduces a novel differential magnetic force microscopy (MFM) imaging technique. It enhances image contrast and signal-to-noise ratio by reducing background forces using a two-pass scanning method with reversed tip magnetization.

Keywords:
differential MFM imagingmagnetic force microscope (MFM)reversed tip magnetization

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physics

Background:

  • Magnetic Force Microscopy (MFM) is crucial for characterizing magnetic materials.
  • Standard MFM can be affected by non-magnetic background forces.
  • Improving image clarity and signal-to-noise ratio (SNR) in MFM is essential for accurate analysis.

Purpose of the Study:

  • To develop an advanced MFM imaging method for enhanced differential magnetic force detection.
  • To significantly reduce or eliminate background and environmental interference forces.
  • To improve the contrast and SNR of MFM images.

Main Methods:

  • A two-pass scanning procedure was employed.
  • The MFM tip magnetization was reversed between the first and second scans.
  • Differential magnetic forces were extracted by subtracting the two scanned images.
  • Scans were performed at a low lift distance between the MFM tip and sample surface.

Main Results:

  • The proposed method effectively reduces background force interference.
  • Differential magnetic force imaging demonstrated significantly improved image contrast.
  • The signal-to-noise ratio (SNR) of the MFM images was substantially enhanced.
  • Both theoretical and experimental results validated the method's efficacy.

Conclusions:

  • The novel two-pass scanning MFM technique provides superior differential magnetic force imaging.
  • This method offers a robust solution for minimizing unwanted forces in MFM analysis.
  • The improved image quality facilitates more precise characterization of magnetic samples.