Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China.
University of Chinese Academy of Sciences, 100049, Beijing, China.
Nat Commun. 2023 Apr 20;14(1):2274. doi: 10.1038/s41467-023-38055-x.
Magnetoelectric coupling, as a fundamental physical nature and with the potential to add functionality to devices while also reducing energy consumption, has been challenging to be probed in freestanding membranes or two-dimensional materials due to their instability and fragility. In this paper, we report a magnetoelectric coupling probed by optical second harmonic generation with external magnetic field, and show the manipulation of the ferroelectric and antiferromagnetic orders by the magnetic and thermal fields in BiFeO films epitaxially grown on the substrates and in the freestanding ones. Here we define an optical magnetoelectric-coupling constant, denoting the ability of controlling light-induced nonlinear polarization by the magnetic field, and found the magnetoelectric-coupling was suppressed by strain releasing but remain robust against thermal fluctuation for freestanding BiFeO.
磁电耦合作为一种基本的物理性质，具有为器件增加功能同时降低能耗的潜力，但由于其不稳定性和脆弱性，在独立膜或二维材料中难以探测。在本文中，我们报告了一种通过外磁场的光学二次谐波产生来探测的磁电耦合，并展示了在基底上外延生长的 BiFeO 薄膜以及独立的 BiFeO 中，磁场和热场对铁电和反铁磁有序的控制。在这里，我们定义了一个光学磁电耦合常数，表示磁场控制光致非线性极化的能力，并发现磁电耦合被应变释放抑制，但对于独立的 BiFeO 来说，它对热波动具有很强的鲁棒性。
