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Related Concept Videos

Magnetic Force01:18

Magnetic Force

2.0K
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...
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Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

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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.
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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Magnetic Force On A Current-Carrying Conductor01:25

Magnetic Force On A Current-Carrying Conductor

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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.
Consider a compass placed near a current-carrying wire. The wire experiences a force that aligns the needle of the compass tangentially around the wire. Thus, the current-carrying wire produces concentric circular loops of magnetic field. The magnetic field generated by a wire can be...
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Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

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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

Force On A Current Loop In A Magnetic Field

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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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The Sense of Self: Reflected Self-Appraisal and Social Comparison02:57

The Sense of Self: Reflected Self-Appraisal and Social Comparison

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According to Charles Cooley, we base our image on what we think other people see (Cooley 1902). We imagine how we must appear to others, then react to this speculation. We don certain clothes, prepare our hair in a particular manner, wear makeup, use cologne, and the like—all with the notion that our presentation of ourselves is going to affect how others perceive us. We expect a certain reaction, and, if lucky, we get the one we desire and feel good about it. But more than that, Cooley...
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Iron Nanowire Fabrication by Nano-Porous Anodized Aluminum and its Characterization
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Magnetic Force Sensing Using a Self-Assembled Nanowire.

N Rossi1, B Gross1, F Dirnberger2

  • 1Department of Physics , University of Basel , 4056 Basel , Switzerland.

Nano Letters
|January 3, 2019
PubMed
Summary
This summary is machine-generated.

We developed a novel scanning magnetic force sensor using a gallium arsenide nanowire with a magnetic tip. This sensor shows promise for high-resolution magnetic field imaging at the nanoscale.

Keywords:
MnAs nanocrystalNanowiremagnetic force microscopynanomagnetismsequential crystallizationtorque magnetometry

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physics

Background:

  • Scanning probe microscopy is crucial for nanoscale characterization.
  • Developing highly sensitive magnetic force sensors is an ongoing challenge.
  • Gallium arsenide (GaAs) nanowires offer unique properties for sensor applications.

Purpose of the Study:

  • To create a scanning magnetic force sensor using a magnet-tipped GaAs nanowire.
  • To characterize the sensor's mechanical and magnetic properties.
  • To evaluate its potential for nanoscale magnetic field imaging.

Main Methods:

  • Growth of individual magnet-tipped GaAs nanowires via molecular beam epitaxy.
  • Characterization of mechanical and magnetic properties through flexural response measurements in a magnetic field.
  • Numerical simulations to determine magnetization configurations.
  • Testing sensor response to patterned current-carrying wires.

Main Results:

  • Successful fabrication of GaAs nanowires with single-crystal MnAs magnetic tips.
  • Identification of equilibrium magnetization configurations, including magnetic vortices.
  • Demonstration of sensor response to nanoscale magnetic field profiles.
  • High force sensitivity and tiny tip size achieved.

Conclusions:

  • Magnet-tipped GaAs nanowires are effective scanning magnetic force sensors.
  • The sensor is suitable for imaging weak magnetic fields at the nanometer scale.
  • Potential applications include mapping mesoscopic transport, spin textures, and nanoscale magnetic resonance.