Physics Lab Equipment

LEAI-16 Microwave Ferromagnetic Resonance Apparatus

LEAI-16 Microwave Ferromagnetic Resonance Apparatus

Note: oscilloscope not included


  • Simple structure

  • High quality microwave devices

  • Stable performance


Ferromagnetic resonance (FMR) is an important topic in magnetism even in solid state physics. It is the basis of microwave ferrite physics. Microwave ferrite has important applications in radar and microwave communications. This microwave ferromagnetic resonance apparatus is an experimental instrument for measuring the ferromagnetic resonance curve of a ferromagnetic specimen. The instructional manual contains comprehensive materials including experimental configurations, principles and step-by-step instructions. Please click Experiment Theory and Contents to find more information about this apparatus.


Using this apparatus, the following experiments can be conducted:

1) Understand and master the functions and usage methods of various microwave devices. 

2) Understand the measurement principle and experimental conditions of ferromagnetic resonance, and observe microwave ferromagnetic resonance phenomena.

3) Determine resonant magnetic field and microwave frequency, calculate gyromagnetic ratio (γ ) and Lande's g-factor (g) of microwave ferrite.

4) Measure ferromagnetic resonance line width (ΔH) and estimate relaxation time (τ) of microwave ferrite material.

5) Learn how to set up and adjust a microwave experimental system.

* Some observed experimental results shown at left.


Microwave System
Specimen1 ( mono-crystal)
Microwave frequency meterrange: 8.6 GHz ~ 9.6 GHz
Waveguide dimensionsinner: 22.86 mm × 10.16 mm (EIA: WR90 or IEC: R100)
Input voltage and accuracyMax: ≥ 20 V, 1% ± 1 digit
Input current range and accuracy0 ~ 2.5 A, 1% ± 1 digit
Stability≤ 1x10-3+5 mA
Strength of magnetic field0 ~ 450 mT
Sweep Field
Output voltage≥ 6 V
Output current range0.2 A ~ 0.7 A
Solid State Microwave Signal Source
8.6 ~ 9.6 GHz
Frequency drift
≤ ± 5×10-4/15 min
Working voltage
~ 12 VDC
Output power
> 20 mW under equal amplitude mode

Operation mode & parameters

Equal amplitude

Internal square-wave modulation

Repetition frequency: 1000 Hz

Accuracy:   ± 15%

Skewness: < ± 20%

Voltage standing wave ratio
< 1.2
Waveguide dimensions
inner: 22.86 mm × 10.16 mm (EIA: WR90 or IEC: R100)

Parts List

Controller Unit1
Support Base3
Microwave System1 set (including various microwave components, source, detector, etc)
Sample1 ( mono-crystal)
Cable1 set
Instructional Manual1

     Apparatus of Microwave Ferromagnetic Resonance.png

Diagram of experimental system

(Click figure to enlarge)

     LEAI-16 Microwave-1.jpg      Output power vs magnetic field

      Magnetic resonance signal on oscilloscope (Y-T mode).jpg

Magnetic resonance signal (Y-T mode)

      Magnetic resonance signal on oscilloscope (X-Y mode).jpg

Magnetic resonance signal (X-Y mode)

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