Magnetic Field Strength Converter — A/m, Oersted, kA/m
Convert between 5 units of magnetic field strength (H-field) — A/m, kA/m, mA/m, oersted (Oe), and Gilbert/cm. Earth's H-field is approximately 40–50 A/m. The coercivity of neodymium magnets exceeds 1,000,000 A/m. H-field differs from B-field (flux density): H describes the magnetising force, B describes the resulting flux. Used in permanent magnet design, data storage media and EMC engineering.
About the Magnetic Field Strength Converter
Magnetic field strength (H-field) represents the magnetic force generated by free currents independent of the material it passes through, measured in amperes per metre (A/m). It differs from magnetic flux density (B-field) in that it does not account for the magnetisation of the medium. The oersted (Oe) is the CGS unit still used in magnetic materials data sheets. The H-field is critical in designing electromagnets, inductors, and magnetic shielding.
- ›Earth's magnetic field is approximately 40–50 A/m (50–65 Oe) at the surface
- ›The coercivity of a permanent magnet (resistance to demagnetisation) is measured in A/m or Oe
- ›High-performance neodymium magnets have coercivity exceeding 1,000,000 A/m
- ›Magnetic field strength inside an MRI solenoid can reach several million A/m