Magnetic Field Shielding Materials

Co netic aa netic s3 6 and mumetal are three unique shielding materials provided by magnetic shield corp.

Magnetic field shielding materials.

The foremost of these is mumetal an industry reference material defined in milspec 14411c. The magnetic field lines are strongly attracted into the shielding material. Formed into alloys and subjected to annealing processes however permeability can reach levels useful for magnetic shielding. 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.

Typical materials used for electromagnetic shielding include sheet metal metal screen and metal foam. Magnetic permeability of non specialized base materials is typically low around 100 for 99 pure nickel for example. The purpose is most often to prevent magnetic fields from interfering with electrical devices. There are many types of shielding materials their alloy composition is a highly guarded secret based on years of extensive research and application.

Common sheet metals for shielding include copper brass nickel silver steel and tin. Unlike other magnetic materials mcl61 is flexible yet sturdy even at small bending radii. Magnetic shielding is a process that limits the coupling of a magnetic field between two locations. 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.

This can be done with a number of materials including sheet metal metal mesh ionized gas or plasma. Yes there are some specialized materials specifically made for magnetic shielding. 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 thinner 0 004 thick material is easy to trim with scissors and shape by hand.

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. Companies that provide magnetic shielding materials typically offer a version of mumetal and some other proprietary alloys. Absorption loss is the primary means to shield low frequency magnetic fields.