Relationship between magnetomechanical effect, magnetostriction and anisotropy in magnetoelastic materials

Jiles, David, Chen, Y., Kriegermeier-Sutton, B. K., Snyder, John Evan, Dennis, K. W. and McCallum, R. W 2001. Relationship between magnetomechanical effect, magnetostriction and anisotropy in magnetoelastic materials. Presented at: March 2001 Meeting of the American Physical Society, Seattle, WA, USA, 1 March 2001.

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Abstract

The relationship between the magnetomechanical effect and magnetostriction in ferromagnetic materials has been investigated. For small changes of magnetic field H and applied stress sigma a thermodynamic relation exists namely (fracdlambdadH)_sigma=(fracdBdsigma)H Therefore the sensitivity of magnetization to small applied stress should depend principally on the piezomagnetic coefficient d = (dlambda/dH). This coefficient depends on the magnetostriction and anisotropy of the material. Although there is no general analytical relationship between magnetostriction and magnetization there are some special cases where such a formulation can be used. In the low field regime the following approximation can be used, lambda = lambdas fracM^2M_s^2 and dlambda/dM = 2lambdas M/M_s^2. Considering the rotation of magnetization against anisotropy in an untextured polycrystalline material with random distribution of easy axes using a one constant approximation to anisotropy, fracdMdH = fracmu0 M_s^2NK where N=3 for uniaxial anisotropy with K>0 such as in cobalt, N=3 for cubic anisotropy with K>0 such as iron and N = -2 for cubic anisotropy with K.

Item Type:	Conference or Workshop Item - unpublished
Status:	Unpublished
Schools:	Schools > Engineering
Last Modified:	08 Sep 2026 15:40
URI:	https://orca.cardiff.ac.uk/id/eprint/20883

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