Magnetomechanical effect

In magnetism, a magnetomechanical effect or a magnetoelastic effect is a phenomenon of changing the magnetic properties of ferromagnetic materials by applying external stresses. The application of external stresses alters the flux density of a magnetized ferromagnet, and thus the shape, and size of its hysteresis loops. Various effects exist, depending on the material.

The first person to identify a magnetomechanical effect was James Prescott Joule in 1842.^[1]

Effects

Magnetomechanical effects connect magnetic, mechanical and electric phenomena in solid materials. Examples include

Magnetostriction and inverse magnetostrictive effect

Magnetostriction, also known as Joule magnetostriction, is the few parts per million change in the length of a ferromagnetic rod upon magnetization.^[2]: 627 The inverse magnetostrictive effect (also known as Villari effect, after Emilio Villari) is the change in magnetization in response to compressive stress.^[3] Magnetostriction is thermodynamically opposite to inverse magnetostriction effect.^[1]

Torque effects

Wiedemann effect (named after Gustav Heinrich Wiedemann) is the twist in a ferromagnetic rod carrying a current induced by magnetization.^[2]: 628 The Matteucci effect (named after Carlo Matteucci) is the inverse effect.^[4][5]

The effect of creating a magnetization by twisting a rod that is longitudinally magnetized is sometimes called the Wertheim effect (after Guillaume Wertheim [ru]).^[6]

ΔE effect

Guillemin effect names the result of a strong magnetic field on a material's response to mechanical stress. It was first reported^[2]: 684 by Claude-Marie Guillemin^[7][8][9] in 1846 in the specific form of the change in the deflection of an iron cantilever when subjected to a coaxial magnetic field. It was later generalized and called the ΔE effect,^[2]: 684 where it refers to changes to E, the Young's modulus.^[10][2] Longitudinal current can cause a similar change in deflection.^[10]

Volume effects

A change in volume due to the application of a magnetic field is called the Barret effect (after William F. Barrett who presented it 1882). The reciprocal effect is called the Nagaoka–Honda effect (named after Hantaro Nagaoka and Kotaro Honda in 1898).^[6]

See also

• Magnetocrystalline anisotropy
• Magnetohydrodynamics
• Electrohydrodynamics

References

1. Lee, E W (1955-01-01). "Magnetostriction and Magnetomechanical Effects". Reports on Progress in Physics. 18 (1): 184–229. doi:10.1088/0034-4885/18/1/305. ISSN 0034-4885.
2. Bozorth, Richard M. (1951). Ferromagnetism. New York: Van Nostrand.
3. Ueno, T.; Qiu, J.; Tani, J. (May 2004). "Magnetic Force Control Based on the Inverse Magnetostrictive Effect". IEEE Transactions on Magnetics. 40 (3): 1601–1605. doi:10.1109/TMAG.2004.826626. ISSN 0018-9464.
4. Skórski, Roman (April 1, 1964). "Matteucci Effect: Its Interpretation and Its Use for the Study of Ferromagnetic Matter". Journal of Applied Physics. 35 (4): 1213–1216. doi:10.1063/1.1713595. ISSN 0021-8979.
5. Malyugin, D. V. (1991-06-02). "On the theory of Wiedemann effects". Journal of Magnetism and Magnetic Materials. 97 (1): 193–197. doi:10.1016/0304-8853(91)90180-I. ISSN 0304-8853.
6. Williams, S. R. (1927-05-01). "Some Experimental Methods in Magnetostriction*". JOSA. 14 (5): 383–408. doi:10.1364/JOSA.14.000383.
7. Guillemin, Comptes Rendus, vol. 22, pp. 264–265, Jun. 1846.
8. Archives des sciences physiques et naturelles: Tables générales des auteurs et des matières de 1846 à 1878 (in French). 1886. p. 130.
9. Mellor, Joseph William (1934). Supplement to Mellor's Comprehensive Treatise on Inorganic and Theoretical Chemistry. Longmans, Green and Company. p. 277.
10. Garshelis, Ivan J.; Kari, Ryan J. (July 2017). "Stimulating Vibration in Magnetoelastic Beams by the Circumferential Fields of Conducted Currents". IEEE Transactions on Magnetics. 53 (7): 1–10. doi:10.1109/TMAG.2017.2674604. ISSN 0018-9464.