When the magnetic vector of a domain reverses direction there will be no magnetostrictive changes in the domain. If the vector jumps through some angle other than 180°, a sudden redistribution of strains will be caused by the change of magnetostriction and a sound wave will travel out from the domain. Simultaneous records have been secured of the sounds and of the magnetization jumps when the magnetization of a nickel wire changes. These records indicate that reversals occur mainly when the magnetization of the specimen is weak. Jumps through other angles than 180° occur in regions of strong as well as weak magnetization.

• Received 17 February 1941

DOI:https://doi.org/10.1103/PhysRev.59.585