We report on the experimental investigation of two types of crossover in the ordered state near the spin‐flop (SF) multicritical point in the orthorhombic antiferromagnet, GdAlO3. (a) The magnetization discontinuity, ΔM (t), at the SF transition increases with power β̃=0.88±0.02 close to the SF multicritical point. Close to a critcal edge point of the SF transition shelf, however, β̃≈0.32. The bicritical‐critical crossover extends over several orders of magnitude. (b) The SF transition shelf was mapped out for different directions of H⊥. The resulting tetracritical point–bicritical line crossover appears to be rather complicated and the experimental results are not yet well understood.

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