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Magnetic Susceptibility and Permeability

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...

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Updated: Mar 12, 2026

Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System

Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System

Published on: June 13, 2010

Magnetic impedance biosensor: A review.

Tao Wang¹, Yong Zhou², Chong Lei²

¹School of Mechatronics Engineering and Automation, Shanghai University, Shanghai 200072, China.

Biosensors & Bioelectronics

|November 10, 2016

Summary

This summary is machine-generated.

Magnetoimpedance sensors show promise for sensitive biosensing, detecting biomolecules for early cancer diagnosis. Further research is needed to advance their biomedical applications.

Keywords:

Biomolecule Cancer cell Detection Label Magnetic nanoparticles Magnetoimpedance biosensor

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Published on: March 18, 2019

Area of Science:

Materials Science
Biomedical Engineering
Nanotechnology

Background:

The magnetoimpedance (MI) effect in soft ferromagnetic materials has been known for two decades.
Biomedical applications of MI sensors are emerging but remain largely underdeveloped.
MI sensors offer potential for highly sensitive detection in biological systems.

Purpose of the Study:

To review the MI effect in soft ferromagnetic materials for biosensing.
To summarize recent advancements in MI-based biosensing applications.
To propose strategies for developing high-performance MI biosensors.

Main Methods:

Review of existing literature on MI effect in ferromagnetic wires, ribbons, and thin films.
Analysis of MI sensor performance in detecting magnetic nanoparticles, ferrofluids, and labeled bioanalytes.
Investigation of environmental factors affecting MI sensor sensitivity, such as biochemical liquids and stray magnetic fields.

Main Results:

MI sensors have demonstrated capability in detecting magnetic nanoparticles, ferrofluids, and magnetically labeled bioanalytes.
Factors like biochemical liquid properties and particle agglomeration influence MI sensor performance.
Stray magnetic fields can impact the sensitivity and accuracy of MI measurements.

Conclusions:

MI sensors are well-suited for ultrasensitive detection of low-concentration biomolecules.
MI biosensors hold significant potential for early cancer diagnosis and screening.
Further development is required to optimize MI biosensor design for clinical applications.