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Related Concept Videos

Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

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The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
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Magnetic Field Due To A Thin Straight Wire01:28

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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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NMR Spectrometers: Resolution and Error Correction01:14

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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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...
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Magnetic Field Due to Two Straight Wires01:18

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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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Magnetic Field Of A Current Loop01:16

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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.
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Related Experiment Video

Updated: Jun 26, 2025

Magnetic Tweezers for the Measurement of Twist and Torque
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Wide Linearity Range 3D Magnetic Sensor and Angular Position Detector Based on a Single FePt Spin-Orbit Torque

Ying Tao1,2,3, Zhe Guo4, Shihao Li5

  • 1School of Automation, China University of Geosciences, Wuhan 430074, China.

ACS Applied Materials & Interfaces
|May 14, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a novel single L10-FePt Hall-bar device for wide-range 3D magnetic field sensing. The innovative sensor offers improved linearity and reduced noise, enhancing precision in automotive applications.

Keywords:
3D magnetic sensorL10 FePtangular position detectionperpendicular magnetic anisotropyspin–orbit torque

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Traditional 3D magnetic sensors often suffer from large size and misalignment due to integrating multiple sensors.
  • Precise motion control in industries like automotive relies heavily on accurate 3D magnetic sensing.

Purpose of the Study:

  • To develop a compact and highly linear 3D vector magnetic sensor.
  • To demonstrate a single Hall-bar device capable of measuring magnetic field components with high accuracy.
  • To explore applications in noncontact angular position detection.

Main Methods:

  • Utilizing a single L10-FePt Hall-bar device for magnetic field detection.
  • Leveraging spin-orbit torque-dominated magnetization reversal for anomalous Hall resistance measurements.
  • Characterizing the sensor's sensitivity, linearity range, and magnetic noise levels.

Main Results:

  • Achieved high sensitivity (291 VA^-1 T^-1 in z-axis, 27 VA^-1 T^-1 in-plane).
  • Demonstrated a wide linear response range (±200 Oe) for x, y, and z magnetic field components.
  • Reported a low magnetic noise level of 7.9 nV at 1 Hz, improving low-frequency measurement resolution.

Conclusions:

  • The single L10-FePt Hall-bar device offers a promising solution for advanced 3D magnetic sensing.
  • The sensor's performance characteristics are suitable for precise position, angle, and rotation detection.
  • Potential applications include enhanced rotational motion control systems.