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We study magnetic susceptibilities of two-dimensional itinerant electronsystems exhibiting symmetry-breaking Fermi surface distortions, the so-calledd-wave Pomeranchuk instability, in a magnetic field. In a pure forwardscattering model, the longitudinal susceptibility chi^{zz} is found to exhibita jump at a critical point. The magnitude of this jump diverges at atricritical point. When scattering processes involving finite momentumtransfers are allowed for, chi^{zz} is expected to diverge also at a criticalpoint. The system displays multiple critical fluctuations. We argue that thefeatures of chi^{zz} are general properties associated with singularities of anon-ordering susceptibility, leading to implications for a variety of materialsincluding Sr_3Ru_2O_7.

Singular non-ordering susceptibility at a Pomeranchuk instability