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How to test the change of magnetic permeability of PermalloyHow to test the change of magnetic permeability of Permalloy

2025-01-06

The change in magnetic permeability of Permalloy can be tested by the following methods:

 1. Hall Effect Measurement:
 - The magnetic permeability is calculated by measuring the change in voltage of the material under different magnetic fields using a Hall effect sensor. By changing the strength of the external magnetic field, the change in magnetic permeability can be observed.

 2. Oscillator method:
 - Using the LC oscillation circuit, the impedance change of the Permalloy sample at different frequencies is measured. By analyzing the change in impedance, the magnetic permeability of the material can be derived.

 3. Hysteresis loop measurement:
 - Use a hysteresis loop instrument (such as a magnetic tester) to measure the hysteresis loop of the sample. By analyzing the shape and area of ​​the hysteresis loop, the magnetic permeability of the material and its changes can be obtained.

 4. AC magnetic permeability measurement:
 - Apply an AC magnetic field at different frequencies and measure the sample's response. By analyzing the sample's phase and amplitude changes, its AC magnetic permeability can be obtained.

 5. DC magnetization measurement:
 - Apply a DC magnetic field and measure the magnetization of the sample, and use the formula to calculate the magnetic permeability. The change in magnetic permeability can be observed by changing the temperature or external conditions.

 6. Temperature dependence test:
 - By performing the above tests at different temperatures, the trend of the magnetic permeability of Permalloy changing with temperature is observed.

 When conducting the test, ensure the stability of the sample preparation and test environment to obtain accurate results. At the same time, record the test data under different conditions for subsequent analysis and comparison.