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Related Concept Videos

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
Magnetic Damping01:17

Magnetic Damping

984
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
984
Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

4.5K
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...
4.5K
Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

2.0K
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.
2.0K
Magnetic Force On A Current-Carrying Conductor01:25

Magnetic Force On A Current-Carrying Conductor

4.8K
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...
4.8K

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High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
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Liquid-Solid Hybrid Magneto-Mechanical Force Sensor.

Tatsuya Yamamoto1, Tomohiro Ichinose1, Hiroki Yasuga1

  • 1National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8568, Japan.

Nano Letters
|December 23, 2025
PubMed
Summary
This summary is machine-generated.

New magnetic fluid force sensors offer high sensitivity for delicate object manipulation. These semiconductor-compatible sensors detect forces below 100 μN using magnetic tunnel junctions and magnetic fluids.

Keywords:
Magnetic fluidforce sensormagnetic tunnel junctionmagneto-mechanicsmagnetoresistance

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sensor Technology

Background:

  • High-sensitivity force sensors are crucial for precise actuator control, especially for fragile objects.
  • Existing sensors using strain gauges or piezoelectric elements lack monolithic integration with semiconductor circuitry, increasing costs and limiting performance.
  • Monolithic integration is desired for cost-effective, high-performance sensing systems.

Purpose of the Study:

  • To develop novel, semiconductor-compatible force sensors with high sensitivity for micro-Newton force detection.
  • To overcome the limitations of traditional force sensors regarding integration and cost.
  • To explore the magneto-mechanical properties of magnetic fluid-MTJ (magnetic tunnel junction) systems for sensing applications.

Main Methods:

  • Fabrication of magnetic tunnel junctions (MTJs) using a semiconductor-compatible mass-production process.
  • Integration of MTJs with a magnetic fluid (MF) to create MF-MTJ sensors.
  • Characterization of the sensors' response to mechanical loads via the tunneling magnetoresistance effect.

Main Results:

  • Developed MF-MTJ force sensors capable of detecting mechanical loads below 100 μN.
  • Demonstrated that MTJs, despite lacking ordinary strain-induced resistance change, exhibit sensitivity through the magneto-mechanical interplay with MF.
  • Confirmed no degradation in magneto-mechanical properties after 10^4 cyclic loading tests, indicating robustness.

Conclusions:

  • MF-MTJ sensors offer a promising, cost-effective solution for high-sensitivity force detection compatible with semiconductor manufacturing.
  • The novel magneto-mechanical sensing mechanism enables precise handling and characterization of fragile objects.
  • The developed sensors show potential for integration into advanced robotic and micro-manipulation systems.