Microwave Ferromagnetic Resonance Apparatus

This ferromagnetic resonance (FMR) experiment system is designed to study the magnetic resonance characteristics of ferromagnetic materials using microwave techniques. It enables students to investigate the resonance properties of YIG single-crystal and polycrystalline samples, determine resonance magnetic fields, calculate the Landé g-factor and gyromagnetic ratio, analyze resonance linewidth, estimate relaxation time, and study magnetic anisotropy. The system also provides practical training in microwave measurement techniques and waveguide operation. Manufactured by Atico Export India.

Experiments :

• Understand the Functions and Adjustment Methods of Various Microwave Components.
• Study the Principles and Experimental Conditions of Ferromagnetic Resonance by Observing Resonance Phenomena.
• Observe the Ferromagnetic Resonance Signal of a YIG Polycrystalline Sample Using an Oscilloscope and Calculate the Landé g-Factor and Gyromagnetic Ratio.
• Measure the Relationship Between Resonant Cavity Output Power and Magnetic Field Using a Digital Galvanometer, Plot the Resonance Curve, Determine the Resonance Magnetic Field, Measure the Resonance Linewidth, and Estimate the Relaxation Time of the YIG Polycrystalline Sample.
• Observe the Ferromagnetic Resonance Signal of a YIG Single-Crystal Sample Using an Oscilloscope and Determine the Resonance Magnetic Field with a Phase Shifter.
• Measure the Waveguide Wavelength and Resonant Frequency of the Resonant Cavity Using the Short-Circuit Piston.
• Measure the Relationship Between the Oriented Resonance Magnetic Field of a YIG Single-Crystal Sample and Crystal Orientation, Determine the Resonance Magnetic Fields Along the Easy and Hard Magnetization Axes, and Calculate the Magnetic Anisotropy Constant and g-Factor.

Short-Circuit Piston :

• Adjustment Range: 0–35 mm

Sample Tube Outer Diameter :

• Approximately 5 mm

Microwave Frequency Meter :

• Measurement Range: 8.2–12.4 GHz

Digital Gauss Meter :

• Range: 20,000 Gs
• Resolution: 1 Gs

Waveguide :

• BJ-100
• Internal Dimensions: 22.86 × 10.16 mm

Excitation Source :

• 0–6 V
• Continuously adjustable
• Resolution: 0.01 V

Modulation Magnetic Field :

• 50 Hz
• 0–16 V (peak-to-peak)
• Continuously adjustable

Digital Galvanometer :

• 20 mA Range (Resolution: 0.01 mA)
• 2 mA Range (Resolution: 0.001 mA)

Experimental Samples :

• YIG Single-Crystal Ball (oriented)
• YIG Polycrystalline Ball