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arXiv · 2305.11505

Fabrication of soft bio-spintronic devices for probing the CISS effect

Ritu Gupta·Hariharan V. Chinnasamy·Dipak Sahu·Saravanan Matheshwaran·Chanchal Sow·Prakash Chandra Mondal
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Abstract

Bio-spinterfaces present numerous opportunities to study spintronics across the biomolecules attached to (ferro)magnetic electrodes. While it offers various exciting phenomena to investigate, it's simultaneously challenging to make stable bio-spinterfaces, as biomolecules are sensitive to many factors that it encounters during thin-film growth to device fabrication. The chirality-induced spin-selectivity (CISS) effect is an exciting discovery demonstrating an understanding that a specific electron's spin (either UP or DOWN) passes through a chiral molecule. The present work utilizes Ustilago maydis Rvb2 protein, an ATP-dependent DNA helicase (also known as Reptin) for the fabrication of bio-spintronic devices to investigate spin-selective electron transport through protein. Ferromagnetic materials are well-known for showing spin-polarization, which many chiral and biomolecules can mimic. We report spin-selective electron transmission through Rvb2 that exhibits 30% spin polarization at a low bias (+ 0.5 V) in a device configuration, Ni/Rvb2 protein/ITO measured under two different magnetic configurations. Our findings demonstrate that biomolecules can be put in circuit components without any expensive vacuum deposition for the top contact. Thus, it holds a remarkable potential to advance spin-selective electron transport in other biomolecules such as proteins, and peptides for biomedical applications.

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Ritu Gupta, Hariharan V. Chinnasamy, Dipak Sahu, Saravanan Matheshwaran, Chanchal Sow, Prakash Chandra Mondal. 2023-05-19. Fabrication of soft bio-spintronic devices for probing the CISS effect. https://arxiv.org/abs/2305.11505

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