Diagram of experimental system
(Click figure to enlarge)
Output power vs magnetic field
Magnetic resonance signal (Y-T mode)
Magnetic resonance signal (X-Y mode)
Note: oscilloscope not included
Features
Simple structure
High quality microwave devices
Stable performance
Introduction
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.
Specifications
| Microwave System | |
| Specimen | 1 ( mono-crystal) |
| Microwave frequency meter | range: 8.6 GHz ~ 9.6 GHz |
| Waveguide dimensions | inner: 22.86 mm × 10.16 mm (EIA: WR90 or IEC: R100) |
| Electromagnet | |
| Input voltage and accuracy | Max: ≥ 20 V, 1% ± 1 digit |
| Input current range and accuracy | 0 ~ 2.5 A, 1% ± 1 digit |
| Stability | ≤ 1x10-3+5 mA |
| Strength of magnetic field | 0 ~ 450 mT |
| Sweep Field | |
| Output voltage | ≥ 6 V |
| Output current range | 0.2 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
| Description | Qty |
| Controller Unit | 1 |
| Electromagnet | 1 |
| Support Base | 3 |
| Microwave System | 1 set (including various microwave components, source, detector, etc) |
| Sample | 1 ( mono-crystal) |
| Cable | 1 set |
| Instructional Manual | 1 |
Diagram of experimental system
(Click figure to enlarge)
Output power vs magnetic field
Magnetic resonance signal (Y-T mode)
Magnetic resonance signal (X-Y mode)
