Tuning antiferromagnetic interlayer exchange coupling in La0.67Ca0.33MnO3-based synthetic antiferromagnets
Tuning antiferromagnetic interlayer exchange coupling in La0.67Ca0.33MnO3-based synthetic antiferromagnets
复制标题
La0.67Ca0.33MnO3 基合成反铁磁体中反铁磁层间交换耦合的调节
DOI：
10.1063/1.5087570
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发表时间：
2019
期刊：
影响因子：
6.1
通讯作者：
Wu Wenbin
中科院分区：
文献类型：
--
作者：
Lan Da;Chen Binbin;Qu Lili;Zhang Kexuan;Xu Liqiang;Jin Feng;Guo Zhuang;Chen Feng;Gao Guanyin;Wu Wenbin
由强相关氧化物组成的合成反铁磁体（S-AFM）最近被证明在自旋电子器件中具有潜在的应用前景。然而，这些全氧化物 S-AFM 中层间交换耦合 (IEC) 的可调性仍不清楚。在这里，我们报告了在 NdGaO3 (NGO) 衬底上生长的 La0.67Ca0.33MnO3/CaRu1-xTixO3 [LCMO/CRTO(x), (0 ≤ x ≤ 0.5)] 超晶格 (SL) 中的 IEC 可以通过改变间隔层的成分以及生长方向来调节。在间隔物 CRO 中掺杂 Ti 后，IEC 从铁磁类型变为反铁磁 (AF) 类型。随着 Ti 掺杂水平 (x) 的增加，AF-IEC 场 (Hex) 在 x = 0.2 处达到峰值，而居里温度 (TC) 和矫顽力 (HC) 单调下降。此外，我们发现与在 NGO(001) 上生长的 SL 相比，在 NGO(110) 基底上生长的 SL 具有更大的 Hex 和更小的 HC。基于这些观察，我们进一步制造了 CRO/LCMO/CRTO(x = 0.5)/LCMO/CRO 形式的“混合”异质结构。由于CRO和CRTO层的集体作用，AF-IEC得以保留，同时TC也得到了极大的增强。在基于 LCMO 的 S-AFM 中观察到的 AF-IEC 的高可调性主要归因于 AFM 中氧化物成分的高度可调特性，这些氧化物成分对化学成分和生长方向都很敏感。我们的工作为控制全钙钛矿氧化物 S-AFM 中的 AF-IEC 行为铺平了道路，其结果可能对氧化物自旋电子器件的设计具有指导意义。由强相关氧化物组成的合成反铁磁体（S-AFM）最近已被证明在自旋电子器件中具有潜在的应用。然而，这些全氧化物 S-AFM 中层间交换耦合 (IEC) 的可调性仍不清楚。在这里，我们报告了在 NdGaO3 (NGO) 衬底上生长的 La0.67Ca0.33MnO3/CaRu1-xTixO3 [LCMO/CRTO(x), (0 ≤ x ≤ 0.5)] 超晶格 (SL) 中的 IEC 可以通过改变间隔层的成分以及生长方向来调节。在间隔物 CRO 中掺杂 Ti 后，IEC 从铁磁类型变为反铁磁 (AF) 类型。随着 Ti 掺杂水平 (x) 的增加，AF-IEC 场 (Hex) 在 x = 0.2 处达到峰值，而居里温度 (TC) 和矫顽力 (HC) 单调下降。此外，我们发现与在 NGO(001) 上生长的 SL 相比，在 NGO(110) 基底上生长的 SL 具有更大的 Hex 和更小的 HC。基于这些观察，我们进一步制造了 CRO/LCMO/CRTO(x = 0.5)/LCMO/C 形式的“混合”异质结构...
Synthetic antiferromagnets (S-AFMs) composed of strongly correlated oxides have recently been demonstrated to show potential applications in spintronic devices. However, the tunability for the interlayer exchange coupling (IEC) in these all-oxide S-AFMs remains unclear. Here, we report that the IEC in La0.67Ca0.33MnO3/CaRu1-xTixO3 [LCMO/CRTO(x), (0 ≤ x ≤ 0.5)] superlattices (SLs) grown on NdGaO3 (NGO) substrates can be tuned via altering the composition of the spacer layer as well as the growth orientation. The IEC changes from ferromagnetic to antiferromagnetic (AF) type upon doping the spacer CRO with Ti. As the Ti doping level (x) increases, the AF-IEC field (Hex) peaks at x = 0.2, while the Curie temperature (TC) and coercivity (HC) decrease monotonously. Also, we find that the SLs grown on NGO(110) substrates possess larger Hex and smaller HC compared with those grown on NGO(001). Based on these observations, we further fabricate a “hybrid” heterostructure in the form of CRO/LCMO/CRTO(x = 0.5)/LCMO/CRO. Thanks to the collective roles of CRO and CRTO layers, the AF-IEC is maintained and meanwhile the TC is greatly enhanced. The observed high tunability of AF-IEC in LCMO-based S-AFM can primarily be ascribed to the highly tunable properties of the oxide constituents in the AFMs, which are sensitive to both the chemical composition and the growth orientation. Our work paves a way to control the AF-IEC behavior in all-perovskite-oxide S-AFMs, and the results may be instructive to the design of oxide spintronic devices.Synthetic antiferromagnets (S-AFMs) composed of strongly correlated oxides have recently been demonstrated to show potential applications in spintronic devices. However, the tunability for the interlayer exchange coupling (IEC) in these all-oxide S-AFMs remains unclear. Here, we report that the IEC in La0.67Ca0.33MnO3/CaRu1-xTixO3 [LCMO/CRTO(x), (0 ≤ x ≤ 0.5)] superlattices (SLs) grown on NdGaO3 (NGO) substrates can be tuned via altering the composition of the spacer layer as well as the growth orientation. The IEC changes from ferromagnetic to antiferromagnetic (AF) type upon doping the spacer CRO with Ti. As the Ti doping level (x) increases, the AF-IEC field (Hex) peaks at x = 0.2, while the Curie temperature (TC) and coercivity (HC) decrease monotonously. Also, we find that the SLs grown on NGO(110) substrates possess larger Hex and smaller HC compared with those grown on NGO(001). Based on these observations, we further fabricate a “hybrid” heterostructure in the form of CRO/LCMO/CRTO(x = 0.5)/LCMO/C...