BiFeO3 is a rare single‐phase multiferroic which shows coupled ferroelectricity, ferroelasticity and antiferromagnetism at room temperature. Many fantastic properties of BiFeO3 are regulated by its domain structure. While (001) rhombohedral BiFeO3 thin films can possibly develop up‐to eight degenerate states of two‐variant 71° ferroelastic domain stripes, complete selective control of all possible switching paths between these states has not yet been achieved. Here, combining phase field simulations and scanning probe microscopy experiments, we demonstrated such a complete selective control. The tip bias and the built‐in field were shown to affect the volume fraction of the 71°, 109° and 180° switched domains in rhombohedral BiFeO3 thin films under single‐point loading. Meanwhile, tip scanning further broke the symmetry of the nucleated domains, leading to different switched domain patterns. We then grew BiFeO3 thin films with a specific two‐variant 71° ferroelastic domain state and showed that such a state could be deterministically switched into the other seven two‐variant domain states by collaborative controlling tip scanning and tip bias in scanning probe microscopy experiments. These results should deepen our current understanding on the domain switching kinetics in BiFeO3 thin films and indicate they are promising platforms for developing configurable electronic and spintronic devices.

中文翻译：

---

通过尖端扫描完成多铁性薄膜中铁弹性畴条纹的选择性切换

BiFeO3 是一种罕见的单相多铁性材料，在室温下表现出耦合的铁电性、铁弹性和反铁磁性。BiFeO3 的许多奇妙特性都是由其域结构调节的。虽然 (001) 菱面体 BiFeO3 薄膜可能会形成多达 8 个双变体 71° 铁弹性畴条的简并态，但尚未实现对这些状态之间所有可能的切换路径的完全选择性控制。在这里，结合相场模拟和扫描探针显微镜实验，我们展示了这样一个完整的选择性控制。研究表明，尖端偏置和内置场会影响单点加载下菱形 BiFeO3 薄膜中 71°、109° 和 180° 转换域的体积分数。同时，尖端扫描进一步打破了成核域的对称性，导致不同的切换域模式。然后，我们生长了具有特定双变体 71° 铁弹性域状态的 BiFeO3 薄膜，并表明通过在扫描探针显微镜实验中协同控制尖端扫描和尖端偏置，可以确定性地将这种状态切换到其他七个双变体域状态。这些结果应该加深我们目前对 BiFeO3 薄膜中域切换动力学的理解，并表明它们是开发可配置电子和自旋电子器件的有前途的平台。