The first experimental realization of a magnetic ${M}_{n+1}A{X}_{n}$ (MAX) phase, $({\mathrm{Cr}}_{0.75}{\mathrm{Mn}}_{0.25}{)}_{2}\mathrm{GeC}$, is presented, synthesized as a heteroepitaxial single crystal thin film, exhibiting excellent structural quality. This self-organized atomic laminate is based on the well-known ${\mathrm{Cr}}_{2}\mathrm{GeC}$, with Mn, a new element in MAX phase research, substituting Cr. The compound was predicted using first-principles calculations, from which a variety of magnetic behavior is envisaged, depending on the Mn concentration and $\mathrm{Cr}/\mathrm{Mn}$ atomic configuration within the sublattice. The analyzed thin films display a magnetic signal at room temperature.

The interlayer ordering between ferromagnetic Fe layers in Fe/V (001) superlattices is switched from initially parallel to antiparallel, as well as antiparallel to parallel, upon introducing hydrogen to the V layers. This process is reversible upon removal of the hydrogen. The results unambiguously prove that the major cause of the interlayer coupling transitions is not the hydrogen-induced changes of the thickness of the V layers, but most likely the distortion of the Fermi surface in the V layers.