Matteucci effect

Matteucci effect is the creation of a helical anisotropy of the magnetic susceptibility of a magnetostrictive material when subjected to a torque. It is one of the magnetomechanical effects, which is thermodynamically inverse to Wiedemann effect.^[1] This effect was described by Carlo Matteucci in 1858. It is observable in amorphous wires with helical ___domain structure, which can be obtained by twisting the wire, or annealing under twist. The effect is most distinct in the so-called 'dwarven alloys' (called so because of the historical cobalt element etymology), with cobalt as main substituent.^[2][3]

See also

• Magnetostriction
• Magnetocrystalline anisotropy

References

1. Bozorth, R. (1951). Ferromagnetism. Van Nostrand.
2. Vazquez, M. (1996). "A soft magnetic wire for sensor applications". Journal of Physics D: Applied Physics. 29 (4): 939–949. doi:10.1088/0022-3727/29/4/001. S2CID 250782232.
3. Matteucci, C. (1858). "Recherches expérimentales sur les phénomènes électromagnétiques développés par la torsion". Annales de Chimie et de Physique. 53, 385.