The strength of shielding magnetic field by the thickness of Permalloy

Permalloy is a nickel-iron alloy with high magnetic permeability, which is usually used to make magnetic shielding materials. The magnetic shielding performance of Permalloy is related to its thickness, alloy composition and magnetic field frequency. Generally speaking, increasing the thickness of Permalloy can improve its magnetic shielding effect, but the specific strength of the shielding magnetic field should also consider the following factors:

1. Thickness: The thicker the Permalloy is, the better the shielding effect. The thickness of Permalloy sheets usually used for shielding ranges from 0.1 mm to several millimeters.

2. Magnetic permeability: The higher the magnetic permeability of Permalloy, the better the shielding effect. The magnetic permeability of Permalloy can reach several thousand or even higher.

3. Magnetic field strength: The shielding effect is related to the strength of the external magnetic field. In weak magnetic fields, Permalloy has a better shielding effect, but in strong magnetic fields, its shielding effect may be weakened.

4. Frequency: Permalloy has a good shielding effect on low-frequency magnetic fields (such as DC magnetic fields and power frequency magnetic fields), but a relatively poor shielding effect on high-frequency magnetic fields.

The calculation of the specific shielding magnetic field strength needs to take these factors into consideration, and may require experiments to determine the best shielding effect. If there are specific application scenarios or parameters, more detailed information can be provided to obtain more accurate calculations or suggestions.