Patent ID: 7479193
Filing Date: 2009-01-20
Classification: H01F,H01L

Abstract:
1. A method of making a positive stress annealed magnetostrictive material capable of sustaining tensile loading, comprising the steps of: a. selecting a ferromagnetic alloy having a positive magnetostriction; b. applying a compressive stress uniaxially to the ferromagnetic alloy along a predetermined stress axis while a magnetic field is being applied uniaxially along an axis perpendicular to the predetermined stress axis; c. heating the ferromagnetic alloy to a temperature below the material softening temperature of the ferromagnetic alloy while the magnetic field and the compression stress are being applied thereto; d. cooling the heated ferromagnetic alloy while the magnetic field and the compression stress are being applied thereto; and e. forming a positive stress-annealed magnetostrictive material capable of sustaining tensile loading.