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In this note we consider Penning trap experiments as probes of axion-mediatedforces. We show that the current measurement of electron's $g$-factor alreadysets a new exclusion limit for monopole-dipole axion forces acting on theelectron spin. We also show that the Penning trap's capability of switching anelectron and a positron can isolate the effect of an axion force and suppresssystematic effects.

New bounds and future prospects for axion force searches at Penning trap experiments