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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 Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

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...
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
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...
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

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.
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.

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Related Experiment Video

Updated: Jul 9, 2026

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

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Published on: July 14, 2021

Magnetoimpedance effect assisted by current-driven transverse domain formation.

Nguyen Van Tuan1, Nguyen Khac Binh2, Dang Huy Hoang2

  • 1Department of Physics, Le Quy Don Technical University Hanoi 100000 Vietnam.

RSC Advances
|July 8, 2026
PubMed
Summary

Researchers enhanced magnetic field sensors using a current-assisted strategy in amorphous microwires. This method improves the magnetoimpedance (MI) effect by engineering magnetic domains, leading to highly sensitive and compact sensors for various applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Magnetic field sensors utilizing the magnetoimpedance (MI) effect are crucial for advanced applications.
  • High-performance miniaturized sensors require precise control over magnetic domain structures and anisotropy.
  • Amorphous magnetic microwires are promising candidates for MI sensors.

Purpose of the Study:

  • To develop a current-assisted strategy for enhancing the MI effect in amorphous Fe-Si-C microwires.
  • To investigate the influence of geometric confinement and DC bias on magnetic domain evolution and MI response.
  • To optimize microwire design for compact and highly sensitive magnetic field sensing.

Main Methods:

  • Laser-assisted microfabrication of amorphous Fe-Si-C microwires with varying widths (250 µm down to 40 µm).
  • Magnetic characterization, impedance measurements, and MuMax³ micromagnetic simulations.
  • Systematic analysis of geometric confinement and DC bias effects on magnetic domains and MI response.

Main Results:

  • Reducing microwire width enhances shape anisotropy and promotes refined magnetic domain structures (stripe-like and helical).
  • DC bias significantly amplifies the MI response by inducing circumferential magnetic fields and enhancing transverse permeability.
  • The narrowest 40 µm microwire achieved a maximum MI ratio of 26.7% under a 70 mA bias, doubling its unbiased value.
  • Micromagnetic simulations confirmed current-induced helical domains and enhanced transverse magnetization as key mechanisms.

Conclusions:

  • Geometric confinement and DC bias cooperatively enhance the MI effect in amorphous microwires.
  • The developed current-assisted strategy offers a scalable approach for designing compact, highly sensitive MI sensors.
  • Optimized microwires show improved field sensitivity and angular response, valuable for flexible electronics and biomedical diagnostics.