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Diamagnetism

Diamagnetism

Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials

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Published on: January 21, 2016

Novel MNZ-type microwave sensor for testing magnetodielectric materials.

Abhishek Kumar Jha¹, Nicolò Delmonte², Adam Lamecki³

¹Department of Microwave and Antenna Engineering, ETI Faculty, Gdańsk University of Technology, Gdańsk, Poland. abhishek.jha@pg.edu.pl.

Scientific Reports

|October 13, 2020

Summary

A novel microwave sensor utilizing the mu-near-zero (MNZ) property effectively tests magnetodielectric materials. This sensor accurately detects changes in permittivity and permeability at microwave frequencies.

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Area of Science:

Electrical Engineering
Materials Science
Electromagnetics

Background:

Magnetodielectric materials possess both electric and magnetic properties.
Accurate characterization of these materials is crucial for advanced applications.
Existing sensing methods may lack sensitivity or specificity for certain material properties.

Purpose of the Study:

To propose and demonstrate a novel microwave sensor with mu-near-zero (MNZ) properties.
To enable sensitive detection of magnetodielectric material properties at 4.5 GHz.
To validate the sensor's performance by measuring known dielectric and magnetic materials.

Main Methods:

A double-layer microwave sensor design incorporating a microstrip line and a metal strip with vias was developed.
The sensor was fabricated using Taconic RF-35 substrate.
Material properties were measured using a vector network analyzer at microwave frequencies.

Main Results:

The sensor demonstrated distinct frequency shifts (45 MHz for permittivity, 78 MHz for permeability) per unit change.
Measurements of standard dielectric and yttrium-gadolinium iron garnet samples showed good agreement with literature values.
The prototype successfully sensed the dielectric and magnetic properties of the tested materials.

Conclusions:

The proposed MNZ microwave sensor is a viable tool for characterizing magnetodielectric materials.
The sensor's design allows for sensitive and accurate measurement of relative permittivity and permeability.
This technology holds potential for material analysis and quality control in microwave applications.