Structural order-dependent magnetic proximity effects in heterostructure of SrIrO₃ and LaCoO₃

An efficient approach to realize novel phenomena is to utilize the proximity effect in heterostructure, through which we can induce specific symmetry breaking on materials which intrinsically does not have one. Among the various proximity effects, magnetic proximity is especially intriguing because, with the right choice of magnetic materials, it is possible to manipulate the spin degrees of freedom of another material through exchange interaction in heterostructure. Here, we fabricate heterostructure of SrIrO₃ (SIO) and LaCoO₃ (LCO) with two different stacking orders on SrTiO₃ (001) substrate. For the LCO/SIO heterostructure, it shows hysteresis loops in both anomalous Hall and magnetoresistance (MR) originating from proximity-induced ferromagnetic SIO, in accordance with previously reported results [1]. Interestingly, in the SIO/LCO heterostructure, no hysteresis loops in both anomalous Hall and MR appear, implying that there is no magnetic proximity in the SIO. This suggests possibility that magnetic proximity to have an effect, more conditions are required than simply combining with magnetic materials. Further investigation can provide insight into this, which could lead to a better understanding of how magnetic proximity works.