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We predict from first principles an entirely topological orbitalmagnetization in the noncoplanar bulk antiferromagnet $\gamma$-FeMn originatingin the nontrivial topology of the underlying spin structure, without anyreference to spin-orbit interaction. Studying the influence of strain,composition ratio, and spin texture on the topological orbital magnetizationand the accompanying topological Hall effect, we promote the scalar spinchirality as key mechanism lifting the orbital degeneracy. The system is thus aprototypical topological orbital ferromagnet, the macroscopic orbitalmagnetization of which is prominent even without spin-orbit coupling. One ofthe remarkable features of $\gamma$-FeMn is the possibility for pronouncedorbital magnetostriction mediated by the complex spin topology in real space.

Prototypical topological orbital ferromagnet $\gamma$-FeMn