Microwave absorption measurements using a broad-band meanderline approach.

Area of Science:

• Materials Science
• Physics
• Electrical Engineering

Background:

• Ferromagnetic resonance (FMR) and electron paramagnetic resonance (EPR) are crucial techniques for characterizing magnetic materials.
• Existing methods for FMR and EPR measurements often have limitations in terms of bandwidth, field dependence, and applicability to micro/nanostructured samples.

Purpose of the Study:

• To introduce a novel wire-wound meanderline approach for broad-band, field-dependent FMR and EPR absorption measurements.
• To demonstrate the versatility of this technique for analyzing thin films and patterned micro-/nanostructured magnetic arrays.

Main Methods:

• Development and fabrication of wire-wound meanderline structures.
• Implementation of microwave measurement protocols for FMR and EPR.
• Characterization of a standard EPR material (2,2-diphenyl-1-picryl-hydrazyl) and a ferromagnetic cobalt thin film.

Main Results:

• Successful demonstration of broad-band FMR and EPR measurements using the meanderline technique.
• The technique proved effective for both continuous thin films and patterned micro-/nanostructured arrays.
• Accurate calibration and characterization of the test materials were achieved.

Conclusions:

• The wire-wound meanderline approach offers a versatile and effective method for advanced FMR and EPR spectroscopy.
• This technique expands the capabilities for analyzing magnetic properties in thin films and micro/nanostructures.
• The described methods provide a valuable tool for researchers in magnetism and materials science.