Invited Speaker: Zhang Xianmin
Northeastern University Key Laboratory of Materials Anisotropy and Texture, Ministry of Education
Category:
2015
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Report Title: Materials Design, Device Fabrication, and Spin-Transport Studies of Organic Spin Valves
Report Overview:
Controlling the spin orientation of electrons in organic semiconductors to enable applications such as information storage and encryption has emerged as one of the new frontiers in the future development of electronics. Our latest research reveals that although organic semiconductors are primarily composed of elements such as carbon, hydrogen, and oxygen, their spatial configuration significantly influences the transport of spin-polarized electrons and device performance.
The experiment focused on organic spin valves with a sandwich structure, using ferromagnetic thin films of Co and Fe3O4 as the top and bottom electrodes, respectively. Three different organic semiconductors—C60, Alq3, and rubrene—were employed as the intermediate layers. The metallic electrodes were grown using magnetron sputtering, while the organic films were prepared by thermal evaporation. Spin-valve devices were fabricated by in-situ exchange of different shadow masks within the vacuum chamber.
We have achieved a remarkably high magnetoresistance response at room temperature. The study also found that the magnetoresistance ratio increases with increasing thickness of the C60 layer and reaches a maximum value. However, in devices based on Alq3 and rubrene, the magnetoresistance ratio continues to decrease as the thickness of the organic layer increases. The experimental results described above were well explained by controlled experiments and theoretical analysis.
In a decade-long retrospective article, Professor Vardeny, the discoverer of organic spin valves, devoted an entire paragraph to evaluating our work and noted that our research was pioneering in nature.
Zhang Xianmin (right)
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