Demagnetization curve is more accurate for AlNiCo magnetism than Gaussmeter.
Why Gaussmeter cannot accurately measure AlNiCo magnetism？
Demagnetization field effect：AlNiCo magnets have high coercivity and low remanence, so they are easily affected by the demagnetization field during measurement. This causes the Gaussmeter to underestimate the actual magnetic field strength.
Anisotropy：AlNiCo magnets are highly anisotropic, which means that their magnetic properties depend on the measurement direction. If the Gaussmeter probe is not aligned with the magnetization direction, the results
will be inaccurate.
Temperature sensitivity：AlNiCo magnets are highly sensitive to temperature fluctuations. Even small changes in ambient temperature can affect the stability and accuracy of Gaussmeter readings.
Limitations of Gaussmeters：Gaussmeters are designed to measure uniform magnetic fields. However, AlNiCo magnets often produce non-uniform magnetic fields, which can cause measurement errors.
Hysteresis effect：AlNiCo magnets have complex hysteresis loops. If the measurement is taken before the material reaches a stable magnetic state, the results may not reflect its true magnetic properties.
Sample shape and size：The shape and size of the AlNiCo sample can significantly affect the magnetic field distribution. In particular, irregularly shaped samples can lead to inaccurate measurements.
Why Demagnetization Curves Are More Accurate？
Comprehensive Data：Demagnetization curves provide a complete picture of a material’s magnetic behavior under different external fields. This includes key parameters such as coercivity and remanence, which are essential for evaluating magnetic properties.
Hysteresis Loop Analysis:Demagnetization curves include hysteresis loops, which reveal the magnetization, demagnetization, and remagnetization processes of a material. This provides a thorough understanding of its magnetic properties.
Directional Independence:Unlike Gaussmeters, demagnetization curves do not rely on the measurement direction. They provide an overall assessment of a material’s magnetic properties, independent of direction.
Practical Applications: Choosing the Right Method
Demagnetization Curves: Ideal for Materials Research, Quality Control, and Applications that Require Accurate Magnetic Property Data.
Conclusion
While Gaussmeters facilitate fast measurements, they are less suitable for accurately evaluating the magnetic properties of AlNiCo due to their limitations in handling anisotropy, temperature sensitivity, and non-uniform fields. Demagnetization curves, on the other hand, provide a more comprehensive and reliable assessment of the magnetic properties of AlNiCo, making them the method of choice for critical applications.