We report the magnetotransport properties of ferromagnet (FM)/antiferromagnet (AFM) ${\mathrm{Fe}}_2\mathrm{CrSi}/{\mathrm{Ru}}_2\mathrm{MnGe}$ epitaxial bilayers using current-in-plane configurations. Above the critical thickness of the ${\mathrm{Ru}}_2\mathrm{MnGe}$ layer to induce exchange bias, symmetric and asymmetric curves were observed in response to the direction of FM magnetocrystalline anisotropy. Because each magnetoresistance curve showed full and partial AFM rotation, the magnetoresistance curves imply the impact of the ${\mathrm{Fe}}_2\mathrm{CrSi}$ magnetocrystalline anisotropy to govern the AFM rotation. The maximum magnitude of the angular-dependent resistance-change ratio of the bilayers is more than an order of magnitude larger than that of single-layer ${\mathrm{Fe}}_2\mathrm{CrSi}$ films, resulting from the reorientation of AFM spins via the FM rotation. These results highlight the essential role of controlling the AFM rotation and reveal a facile approach to detect the AFM moment even in current-in-plane configurations in FM/AFM bilayers.

• Received 27 December 2016
• Revised 3 March 2017

DOI:https://doi.org/10.1103/PhysRevB.95.134413