Cheng Yuxin, Dong Guohua, Li Yaojin, Yang Guannan, Zhang Butong, Guan Mengmeng, Zhou Ziyao, Liu Ming
The Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, School of Electronic Science and Engineering, State Key Laboratory for Mechanical Behavior of Materials, the International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology, Xi'an Jiaotong University, Xi'an 710049, China.
ACS Nano. 2022 Jul 26;16(7):11291-11299. doi: 10.1021/acsnano.2c04754. Epub 2022 Jul 18.
The rapid development of spintronics requires the devices to be flexible, to be used in wearable electronics, and controllable, to be used with magnetoelectric (ME) structures. However, the clamping effect inevitably leads to a decreased ME effect on the rigid substrate, and it remains challenging to directly prepare high-quality ferroelectric (FE) membranes on the widely used flexible substrate such as MICA or polyimide (PI). Here, periodic wrinkle-patterned flexible (Co/Pt)/BaTiO (BTO) perpendicular magnetic anisotropy (PMA) heterostructures were prepared using the water-soluble method. The high-quality single-crystal BTO membrane ensures that intricate wrinkles do not fracture and a high ME coefficient is achievable. The transferred sample that is released from the clamping effect shows an enhanced ME effect in both in-plane and out-of-plane directions, with the ME coefficient reaching up to 68 Oe °C. The ferromagnetic resonance (FMR) field of the flexible sample can be tuned by tensile strain up to 272 Oe. The finely controlled wrinkle shows periodic strain variations at peak and valley regions that switch the PMA magnetic domain motion as an effective control method. The proposed ultraflexible wrinkle sample shows great potential for combining multiple magnetization tuning approaches, allowing it to potentially serve as a tunable high-density 3D storage prototype.
自旋电子学的快速发展要求器件具备柔韧性以用于可穿戴电子产品，同时具备可控性以与磁电（ME）结构配合使用。然而，夹紧效应不可避免地导致在刚性衬底上的ME效应降低，并且在诸如云母或聚酰亚胺（PI）等广泛使用的柔性衬底上直接制备高质量铁电（FE）膜仍然具有挑战性。在此，使用水溶性方法制备了具有周期性皱纹图案的柔性（Co/Pt）/钛酸钡（BTO）垂直磁各向异性（PMA）异质结构。高质量的单晶BTO膜确保了复杂的皱纹不会断裂并且可实现高ME系数。从夹紧效应中释放出来的转移样品在面内和面外方向上均表现出增强的ME效应，ME系数高达68 Oe/°C。柔性样品的铁磁共振（FMR）场可通过拉伸应变调节至272 Oe。精细控制的皱纹在峰值和谷值区域显示出周期性应变变化，可作为一种有效的控制方法来切换PMA磁畴运动。所提出的超柔性皱纹样品在结合多种磁化调节方法方面具有巨大潜力，使其有可能用作可调谐高密度3D存储原型。
