An induction method to calculate the complex permeability of soft magnetic films without a reference sample

Area of Science:

• Materials Science
• Electromagnetism
• Thin Film Analysis

Background:

• Accurate characterization of magnetic properties is crucial for advanced materials.
• Existing methods for measuring complex permeability often require reference samples and have limitations in sensitivity or frequency band.

Purpose of the Study:

• To develop a new analytical method for calculating complex permeability spectra.
• To achieve higher sensitivity and a wider frequency band compared to conventional techniques.
• To validate the method's accuracy using magnetic thin films.

Main Methods:

• Utilizing an electromagnetic induction principle with a short-circuited microstrip line jig.
• Calculating complex permeability spectra without a known reference sample.
• Measuring magnetic thin films with in-plane uniaxial anisotropy.

Main Results:

• The proposed method demonstrates higher sensitivity and a wider frequency band than coplanar waveguide and pick-up coil methods.
• Experimental results for magnetic thin films show complex permeability spectra in good agreement with theoretical analysis.
• Measured permeability values were verified against initial susceptibility, with less than 5% difference.

Conclusions:

• The short-circuited microstrip line induction method provides an accurate and efficient way to determine complex permeability spectra.
• This technique eliminates the need for reference samples, simplifying magnetic thin film characterization.
• The method's performance is suitable for analyzing magnetic thin films with uniaxial anisotropy.