Wang Zhongxuan, Wang Qian, Gong Weiyi, Chen Amy, Islam Abdullah, Quan Lina, Woehl Taylor J, Yan Qimin, Ren Shenqiang
Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742.
Department of Chemistry, Virginia Tech, Blacksburg, VA 24060.
Proc Natl Acad Sci U S A. 2024 Apr 23;121(17):e2322361121. doi: 10.1073/pnas.2322361121. Epub 2024 Apr 16.
Growing crystallographically incommensurate and dissimilar organic materials is fundamentally intriguing but challenging for the prominent cross-correlation phenomenon enabling unique magnetic, electronic, and optical functionalities. Here, we report the growth of molecular layered magnet-in-ferroelectric crystals, demonstrating photomanipulation of interfacial ferroic coupling. The heterocrystals exhibit striking photomagnetization and magnetoelectricity, resulting in photomultiferroic coupling and complete change of their color while inheriting ferroelectricity and magnetism from the parent phases. Under a light illumination, ferromagnetic resonance shifts of 910 Oe are observed in heterocrystals while showing a magnetization change of 0.015 emu/g. In addition, a noticeable magnetization change (8% of magnetization at a 1,000 Oe external field) in the vicinity of ferro-to-paraelectric transition is observed. The mechanistic electric-field-dependent studies suggest the photoinduced ferroelectric field effect responsible for the tailoring of photo-piezo-magnetism. The crystallographic analyses further evidence the lattice coupling of a magnet-in-ferroelectric heterocrystal system.
生长晶体学上不匹配且不同的有机材料从根本上来说很有趣，但对于实现独特的磁、电和光学功能的显著交叉相关现象而言具有挑战性。在此，我们报道了分子层状磁电晶体的生长，展示了对界面铁性耦合的光操控。这种异质晶体表现出显著的光磁化和磁电效应，导致光多铁性耦合以及颜色的完全变化，同时继承了母相的铁电性和磁性。在光照下，异质晶体中观察到910奥斯特的铁磁共振位移，同时显示出0.015emu/g的磁化强度变化。此外，在铁电向顺电转变附近观察到明显的磁化强度变化（在1000奥斯特外场下磁化强度的8%）。基于电场的机理研究表明，光诱导铁电场效应是光压磁特性调控的原因。晶体学分析进一步证明了磁电异质晶体系统的晶格耦合。
