Physics Lab Equipment

LEAI-16 Microwave Ferromagnetic Resonance Apparatus

LEAI-16 Microwave Ferromagnetic Resonance Apparatus

Note: oscilloscope not included

Features

  • Simple structure

  • High quality microwave components

  • Stable performance



Introduction


Ferromagnetic resonance (FMR) is a key phenomenon in magnetism, particularly in the study of solid-state physics. It plays a foundational role in understanding microwave ferrite physics, which has significant applications in radar systems and microwave communications. FMR involves the interaction between microwave radiation and the magnetization of ferromagnetic materials, and it is used to study the magnetic properties of these materials.


The LEAI-16 Microwave Ferromagnetic Resonance Apparatus is designed to provide hands-on experience for students to explore FMR and its associated phenomena. This experimental system is capable of measuring the ferromagnetic resonance curve of a ferromagnetic specimen, which is essential for understanding the magnetic characteristics of materials under microwave irradiation.


The instruction manual offers a comprehensive guide, including experimental configurations, theoretical principles, and step-by-step instructions, making it a suitable tool for learning and mastering the principles of microwave ferromagnetic resonance. 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 Applications of Various Microwave Components:

   The system includes a variety of microwave components that are integral to conducting FMR experiments. Students will learn the roles and applications of these components in creating and measuring microwave signals, which are essential for observing ferromagnetic resonance phenomena.


2. Understand the Measurement Principle and Experimental Conditions of Ferromagnetic Resonance:

   This experiment provides students with an understanding of the principles behind FMR, focusing on the relationship between microwave radiation and ferromagnetic materials. Students will observe the FMR phenomena and learn the experimental conditions required for accurate measurements.


3. Determine Resonant Magnetic Field and Microwave Frequency, and Calculate Gyromagnetic Ratio (γ) and Lande's g-Factor (g):

   In this experiment, students will determine the resonant magnetic field and microwave frequency for a given ferromagnetic specimen. By analyzing these parameters, they will calculate the gyromagnetic ratio (γ) and Lande's g-factor (g), which are important for understanding the material's magnetic properties.


4. Measure Ferromagnetic Resonance Line Width (ΔH) and Estimate Relaxation Time (τ) of Microwave Ferrite Material:

   Students will measure the resonance line width (ΔH) of the FMR curve and estimate the relaxation time (τ) of the microwave ferrite material. These measurements are crucial for understanding the dynamic behavior of ferromagnetic materials and their response to microwave fields.


5. Learn How to Set Up and Adjust a Microwave Experimental System:

   This experiment teaches students how to set up and adjust a microwave experimental system for FMR studies. This includes configuring the apparatus, adjusting the magnetic field, and optimizing the microwave signal to observe and measure FMR effects accurately.


Specifications

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)
Electromagnet
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
Dimensions140 mm (diameter) x 270 mm (height)
Pole spacing~ 20 mm
Sweep Field
Output voltage≥ 6 V
Output current range0.2 A ~ 0.7 A
Solid State Microwave Signal Source
Frequency
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

DescriptionQty
Controller Unit1
Electromagnet1
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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