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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

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Characterization of magnetic materials using a scanning microwave microprobe.

Harutyun Melikyan¹, Artur Hovsepyan, Tigran Sargsyan

¹Department of Physics and Interdisciplinary Program of Integrated Biotechnology, Sogang University, Seoul 121-742, Republic of Korea.

Ultramicroscopy

|June 13, 2008

Summary

This study uses near-field microwave microprobing to analyze the electromagnetic properties of various metal thin films. The noncontact method accurately characterizes metals, including magnetic permalloy films, aligning well with theoretical predictions.

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Area of Science:

Materials Science
Electromagnetism
Physics

Background:

Accurate characterization of electromagnetic properties is crucial for metal thin films.
Traditional methods for evaluating metals and magnetic metals can be limited.
Near-field microwave techniques offer advanced noncontact evaluation capabilities.

Purpose of the Study:

To investigate the electromagnetic properties of various metal thin films (Fe, Ni, Co, Al, Au, Cu, Ag, permalloy) on SiO2 substrates.
To compare experimental measurements with theoretical models for electromagnetic properties.
To demonstrate the utility of near-field scanning microwave microprobe (NSMM) for characterizing magnetic materials like permalloy.

Main Methods:

Utilized a near-field microwave microprobe for noncontact evaluation.
Measured the microwave reflection coefficient S(11) for electromagnetic property estimation.
Employed a near-field scanning microwave microprobe (NSMM) system to observe hysteresis behavior in permalloy films.

Main Results:

Experimental electromagnetic properties of metal sheets were estimated and compared to theoretical values.
Hysteresis behavior was successfully observed in permalloy thin films.
Experimental results showed good agreement with the theoretical transmission model.

Conclusions:

Near-field microwave microprobing provides an effective noncontact method for characterizing electromagnetic properties of metals.
The NSMM system is suitable for evaluating magnetic properties, such as hysteresis, in thin films.
The study validates the use of near-field microwave techniques as an alternative to conventional characterization methods.