Antiferromagnets have been attracting tremendous interest in the spintronics community due to their intrinsic appealing properties, such as zero stray field and ultrafast spin dynamics. Recently, the electrical manipulation of bulk properties of antiferromagnets has been widely studied, but exploring the use of antiferromagnetic (AFM) interfacial properties to investigate some key issues in spintronic devices is urgently desired. In this study, the magnetic and spin transport properties mediated by interlayer exchange coupling (IEC) are examined through spin-orbit torque (SOT)-induced tunability of interfacial spins in heavy-metal/like-synthetic antiferromagnet/antiferromagnet heterostructure devices. We found that the exchange bias and coercivity and the critical current density for SOT switching can be modulated by IEC, associating with the oscillation of SOT-induced interfacial spins reorientation at zero field, which can be well understood with the modified Ruderman-Kittel-Kasuya-Yosida model. Our finding opens a new route for understanding and using the AFM interfacial spins in spintronics.

反铁磁体由于其固有的吸引人的特性（例如零杂散场和超快自旋动力学特性）而在自旋电子学领域引起了极大的兴趣。最近，对反铁磁体的整体性质的电操纵进行了广泛的研究，但是迫切需要探索使用反铁磁（AFM）界面性质来研究自旋电子器件中的一些关键问题。在这项研究中，通过自旋轨道转矩（SOT）诱导的重金属/类似合成反铁磁体/反铁磁体异质结构器件中界面自旋的可调谐性，研究了由层间交换耦合（IEC）介导的磁和自旋输运性质。我们发现SOT开关的交流偏置和矫顽力以及临界电流密度可以通过IEC进行调制，与SOT诱导的界面自旋在零磁场下重新定向的振荡相关联，这可以通过修改后的Ruderman-Kittel-Kasuya-Yosida模型很好地理解。我们的发现为理解和使用自旋电子学中的AFM界面自旋开辟了一条新途径。