The effect of stress and incentive magnetic field on the average volume of magnetic Barkhausen jump in iron

• We deduce the theoretical relationship among v¯, σ and H.
• We analyze the displacement of domain wall for single crystal.
• We analyze effect of H and σ   on v¯.
• The critical magnetic field should be adopted as the incentive magnetic field.
• The critical magnetic field provides the basic energy for domain wall movement.

The average volume of magnetic Barkhausen jump (AVMBJ) v¯ generated by magnetic domain wall irreversible displacement under the effect of the incentive magnetic field H for ferromagnetic materials and the relationship between irreversible magnetic susceptibility χirr and stress σ   are adopted in this paper to study the theoretical relationship among AVMBJ v¯(magneto-elasticity noise) and the incentive magnetic field H  . Then the numerical relationship among AVMBJ v¯, stress σ and the incentive magnetic field H is deduced. Utilizing this numerical relationship, the displacement process of magnetic domain wall for single crystal is analyzed and the effect of the incentive magnetic field H and the stress σ   on the AVMBJ v¯ (magneto-elasticity noise) is explained from experimental and theoretical perspectives. The saturation velocity of Barkhausen jump characteristic value curve is different when tensile or compressive stress is applied on ferromagnetic materials, because the resistance of magnetic domain wall displacement is different. The idea of critical magnetic field in the process of magnetic domain wall displacement is introduced in this paper, which solves the supersaturated calibration problem of AVMBJ-σAVMBJ-σ calibration curve.