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Related Concept Videos

Magnetic Fields01:27

Magnetic Fields

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...
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
Magnetic Force01:18

Magnetic Force

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...
Magnetic Vector Potential01:15

Magnetic Vector Potential

In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
Consider an ideal solenoid with n turns per unit length and radius R. If I is the current through the solenoid, the magnetic field inside the solenoid is expressed as the product of vacuum...
Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

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...
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...

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Related Experiment Video

Updated: Jun 25, 2026

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

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

Published on: July 20, 2022

Variable-field magnetic force microscopy.

M Jaafar1, J Gómez-Herrero, A Gil

  • 1Instituto de Ciencia de Materiales de Madrid, CSIC, 28049 Madrid, Spain.

Ultramicroscopy
|March 3, 2009
PubMed
Summary
This summary is machine-generated.

A novel magnetic force microscope allows stable imaging under variable in-plane and out-of-plane magnetic fields. This versatile tool demonstrates magnetic writing and reading capabilities on diverse materials.

More Related Videos

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons
09:54

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

Published on: July 14, 2021

Related Experiment Videos

Last Updated: Jun 25, 2026

Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
07:42

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

Published on: July 20, 2022

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons
09:54

Fabrication of Magnetic Platforms for Micron-Scale Organization of Interconnected Neurons

Published on: July 14, 2021

Area of Science:

  • Materials Science
  • Physics
  • Nanotechnology

Background:

  • Magnetic Force Microscopy (MFM) is crucial for nanoscale magnetic imaging.
  • Controlling external magnetic fields during MFM is challenging.
  • Existing MFM systems have limitations in applying variable fields.

Purpose of the Study:

  • Introduce a new variable external field magnetic force microscope.
  • Demonstrate its capability for stable imaging under controlled magnetic fields.
  • Showcase its application in magnetic writing and reading.

Main Methods:

  • Development of a novel variable external field magnetic force microscope.
  • Application of in-plane and out-of-plane magnetic fields.
  • Imaging of diverse magnetic materials including graphite, storage media, FePt films, and Ni nanowires.

Main Results:

  • Stable imaging achieved under variable in-plane and out-of-plane magnetic fields.
  • Successful characterization of magnetic properties in highly oriented pyrolytic graphite, longitudinal magnetic storage media, FePt thin films, and Ni nanowires.
  • Demonstration of the microscope's utility as a magnetic writing-reading technique.

Conclusions:

  • The new variable external field MFM offers enhanced control over magnetic fields for imaging.
  • The system is effective for characterizing a range of magnetic materials.
  • The developed MFM serves as a valuable tool for magnetic data storage research and development.