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Abstract:
The combination of organic molecular materials and inorganic solid materials has drawn much attention in various scientific research fields,such as condensed matter physics,materials engineering technology,and molecular biology. Organic molecular materials have their own unique advantages,such as flexibility,plasticity,tunability,scalability,and addressability. Furthermore,they can easily combine with inorganic materials to form heterojunctions and produce unique properties at the interface. Spintronics has brought traditional electronics into the quantum age. In the field of information storage and quantum computing,the investigation about manipulating electron spins is developing rapidly. Since the required energy to manipulate the spin of an electron is only one-thousandth of the energy to drive the directional movement of an electron,the consumed energy of spintronic devices is much lower than that of traditional microelectronic devices. Spintronics and molecular chemistry have achieved extraordinary research results in their respective fields. Their combination can apply the advantages of molecular diversity to manipulate or intervene the electron spin. New functional devices with molecular interfaces are fabricated based on this research direction,which have become a scientific hotspot in the information storage field. Generally,spin polarization comes from magnetic materials controlled by magnetic fields. In contrast,recent studies have found that non-magnetic chiral molecules can produce spin polarization through their chiral structure. This phenomenon is called chiral-induced spin selectivity(CISS)effect. The spiral structure of chiral molecules,such as DNA and peptides,can induce extremely strong spin-orbit coupling,which results in high spin polarization in electric currents. This effect has been confirmed by numerous experiments. The discovery of the CISS effect has greatly promoted the development and performance of spintronic devices. It has been found that many types of chiral materials have the CISS effect except for DNA and peptide molecules,such as spiral hydrocarbon macromolecules,paramagnetic chiral molecules,superhelical polyaniline microfibers,and chiral hybrid perovskites. This review introduced the experimental results,theoretical models,device performance,and the latest research progress of CISS in recent years. Compared with traditional ferromagnetic metals,the CISS effect based on the molecular chiral structure had many advantages,such as high spin polarization,excellent molecular interface,simple preparation process,and very low production cost. More important,it could achieve highly efficient spin injection into metals and semiconductors without using external magnetic fields and ferromagnetic electrodes. The "chiral molecule/semiconductor" structure was reported to overcome the problem of interfacial conductivity mismatch. A smooth charge/spin transport channel was formed between the organic molecule and the semiconductor,which greatly reduced charge/spin scattering. The conductivity phase transition from metal to insulator was induced,and a large modulation of Curie temperature and magnetic moment orientation was obtained in semiconductors through molecules. It was expected to achieve highly efficient spin injection into metals/semiconductors through self-assembling chiral molecules,instead of the complex process of growing and fabricating ferromagnetic metals. Spin logic devices with ultra-high speed,low power consumption and simple preparation were designed. This review introduced the novel technologies for information storage by using non-magnetic organic molecules,which provided a feasible direction for the practical application of spintronic devices. © 2023 Editorial Office of Chinese Journal of Rare Metals. All rights reserved.
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Chinese Journal of Rare Metals
ISSN: 0258-7076
Year: 2023
Issue: 8
Volume: 47
Page: 1163-1177
Cited Count:
WoS CC Cited Count: 0
SCOPUS Cited Count: 1
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 5
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