Abstract
Critical parameters defining the local nucleation field in amorphous ferromagnetic microwires with positive magnetostriction are obtained analytically through scaling procedures. An exact value of the nucleation field is obtained numerically as a function of geometric parameters of anisotropy distribution, which is fully taken into account instead of being averaged out. It is established that the value of the nucleation field depends predominantly on the steepness of the anisotropy change within the boundary between axial and radial domains, while the maximal value of anisotropy inside the wire or an overall average is not relevant.
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