A Hybrid Magneto-Optic Capacitive Memory with Picosecond Writing Time
A Hybrid Magneto-Optic Capacitive Memory with Picosecond Writing Time
复制标题
DOI：
10.1002/adfm.202212173
复制
发表时间：
2023-01-20
影响因子：
19
通讯作者：
Cespedes，Oscar
中科院分区：
文献类型：
--
作者：
Rogers，Matthew;Habib，Ahasan;Cespedes，Oscar
信息存储的长期未来要求在高频运行的建筑中使用可持续的纳米材料。接口可以通过突破传统操作方法的紧急功能在这一追求中发挥关键作用。在这里，自旋过滤效应和光电流结合在一个混合磁容存储器中的金属-分子-氧化物结处。金属-富勒烯-金属氧化物器件的光暴露导致自旋极化电荷捕获和磁性界面的形成。由于磁性是由光电流产生的，写入时间由激子的形成和分裂、电子跳跃和自旋相关的陷阱决定。瞬时吸收光谱测量表明，在光泵浦的皮秒内，电子态随器件的磁历史而变化。在微波辐射期间，使用时间分辨扫描磁光克尔效应测量来读取存储的信息。皮秒时间尺度中磁性界面的出现为设计高频混合磁光结构用于传感、计算和信息存储开辟了新的研究途径。
The long‐term future of information storage requires the use of sustainable nanomaterials in architectures operating at high frequencies. Interfaces can play a key role in this pursuit via emergent functionalities that break out from conventional operation methods. Here, spin‐filtering effects and photocurrents are combined at metal‐molecular‐oxide junctions in a hybrid magneto‐capacitive memory. Light exposure of metal‐fullerene‐metal oxide devices results in spin‐polarized charge trapping and the formation of a magnetic interface. Because the magnetism is generated by a photocurrent, the writing time is determined by exciton formation and splitting, electron hopping, and spin‐dependent trapping. Transient absorption spectroscopy measurements show changes in the electronic states as a function of the magnetic history of the device within picoseconds of the optical pumping. The stored information is read using time‐resolved scanning magneto optic Kerr effect measurements during microwave irradiation. The emergence of a magnetic interface in the picosecond timescale opens new paths of research to design hybrid magneto‐optic structures operating at high frequencies for sensing, computing, and information storage.