Magnetic Field Shielding Materials

Typical materials used for electromagnetic shielding include sheet metal metal screen and metal foam.

Magnetic field shielding materials.

Companies that provide magnetic shielding materials typically offer a version of mumetal and some other proprietary alloys. They are also very expensive. Yes there are some specialized materials specifically made for magnetic shielding. The purpose is most often to prevent magnetic fields from interfering with electrical devices.

Formed into alloys and subjected to annealing processes however permeability can reach levels useful for magnetic shielding. Magnetic shielding materials have very high permeability and pull the magnetic field lines forcing them to pass through them thus reducing the magnetic field values in the rest of the space. Choose a material that is thick and has electrically conductive properties and high permeability. The foremost of these is mumetal an industry reference material defined in milspec 14411c.

Magnetic field shielding film mcl61 this magnetic field shielding material is made from an amorphous cobalt alloy which makes it perfect for shielding against low frequency magnetic fields high frequency fields and low frequency electric fields. The magnetic field lines are strongly attracted into the shielding material. Magnetic permeability of non specialized base materials is typically low around 100 for 99 pure nickel for example. There are many types of shielding materials their alloy composition is a highly guarded secret based on years of extensive research and application.

Magnetic shielding materials used in electronic enclosures dissipate the electromagnetic energy converting it to heat. This can be done with a number of materials including sheet metal metal mesh ionized gas or plasma. Common sheet metals for shielding include copper brass nickel silver steel and tin. For most magnetic shielding applications a high permeability material known throughout the industry as mumetal or hymu 80 is the magnetic shielding material of choice.

The best material available for shielding dc elf vlf magnetic fields used for years in industry to shield delicate electronic components from emfs this 80 nickel alloy magnetic shielding foil is now available at affordable prices for home and office use. Absorption loss is the primary means to shield low frequency magnetic fields. Magnetic shielding is a process that limits the coupling of a magnetic field between two locations.