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Delta E effect
Magnetomechanical effect From Wikipedia, the free encyclopedia
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The Delta E (ΔE) effect is a magnetomechanical effect. The name refers to changes in the effective elastic moduli of a magnetostrictive material, particularly the Young's modulus E, when a magnetic field is applied to a material.
This effect is connected to the tendency of a previously bent rod, made of magnetostrictive material, to straighten when subjected to a magnetic field applied along the rod's axis.[1] This macroscopic effect is sometimes called the Guillemin effect, attributed to Claude-Marie Guillemin who first discussed the effect in 1846.[2][3][4] The first explanations to the ΔE effect were given in the 1930s.[5]
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Description
The ΔE effect is often just considered in terms of a change of the effective Young modulus of a material under the application of a magnetic field. It is a consequence of the geometry and magnetic anisotropy of the magnetic domains.[6] The Young's modulus changes from zero field to saturation.[6] The change in theYoung's modulus ΔE is written as
where is the Young modulus at saturation and is the Young modulus in the unsaturated state.[6] The effect is more general than this, and leads to changes in the values of all components of the elastic modulus tensor in a magnetic field.[7]
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Applications
The ΔE effect is used in applications to build actuators and sensors.[6]
See also
References
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