Loss of Monotonicity in the Vector Play Model and Consequences for Newton-Type Solvers

arXiv:2611.00168v1 Announce Type: new Abstract: The vector play model (VPM) replaces the implicit minimization of the energy-based hysteresis model (EBM) by an explicit update. Its tangent contains the product of the Hessians of two unrelated potentials and is unsymmetric. Hence, the VPM has no co-energy density at frozen memory, and the skew part makes $\boldsymbol{H}\mapsto\boldsymbol{B}$ lose monotonicity in a band just outside the pinning circle, into which small time steps drive the sliding states. In composite models, the determinant of the tangent can change sign, which explains published failures of the local inversion $\boldsymbol{B}\mapsto\boldsymbol{H}$, and where it is negative, $\boldsymbol{H}\mapsto\boldsymbol{B}$ is not injective. In the scalar potential formulation, the exact tangent keeps a descent guarantee, whereas symmetric surrogates of the tangent, such as the symmetrized tangent or Broyden-Fletcher-Goldfarb-Shanno (BFGS) updates, lose it and become ascent directions where the skew part dominates, as computations of TEAM Problem 32 confirm. It is therefore recommended to use solvers with an unsymmetric tangent.

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