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The quasi-two-dimensional van der Waals magnet Fe$_{5-\delta}$GeTe$_2$ hasemerged as a promising platform for electronic and spintronic functionalitiesat room temperature, owing to its large ferromagnetic ordering temperature$T_{\text{C}}$ $\sim$ 315 K. Interestingly, by cobalt (Co) substitution of ironin F5GT, $i.e.$ $({\text{Fe}}_{1-x}{\text{Co}}_x)_{5-\delta}{\text{GeTe}}_2$(Co-F5GT), not only can its magnetic transition temperature be furtherenhanced, but the magnetic and structural ground states can also be tuned.Specifically, an antiferromagnetic (AFM) order is induced beyond the Co dopinglevel $x \ge 0.4$. Here, we investigate the magnetic properties of a Co-F5GTsingle crystal at $x = 0.45(1)$, by utilizing the element specific, resonantmagnetic x-ray scattering technique. Our study reveals an A-type, Ising-likeAFM ground state, with a transition temperature $T_{\text{N}}$ $\sim$ 340 K. Inaddition, our work unveils an important contribution from Co magnetic momentsto the magnetic order. The application of the in-plane magnetic fieldsgradually polarize the spin moments along the field direction, but withoutinducing incommensurate spin texture(s).

Antiferromagnetic order in Co-doped Fe$_5$GeTe$_2$ probed by resonant magnetic x-ray scattering