Spin Chiral Anisotropy of Chiral Mesostructured Inorganic Materials with Different Intrinsic Magnetisms

Ji, Ting; Che, Shunai; Duan, Yingying

doi:10.1021/accountsmr.3c00170

Cited by 6 publications

(1 citation statement)

References 56 publications

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“…MCD and CD spectra tested under various magnetic fields at room temperature are powerful tools to investigate the spin chiral anisotropy (SChA) in chiral materials . To gain a deeper understanding of the spin polarization in CCOF-9-Co, we conducted a systematic study of the MCD due to its particular sensitivity to the polarized electronic states near the absorption bond .…”

Section: Results and Discussionmentioning

confidence: 99%

Covalent Organic Frameworks with Tunable Chirality for Chiral-Induced Spin Selectivity

Han,

Jiang,

Hou

et al. 2024

J. Am. Chem. Soc.

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Chiral covalent organic frameworks (CCOFs) have attracted extensive interest for their potential applications in various enantioselective processes. However, the exploitation of chirality-induced spin selectivity (CISS) that enables a new technology for the injection of spin polarized current without the need for a permanent magnetic layer within CCOFs remains a largely untapped area of research. Here, we demonstrate that, for the first time, COFs can be an attractive platform to develop spin filter materials with efficient CISS. This facilitates the design and synthesis of a new family of Zn(salen)-based 2D CCOFs, namely, CCOFs-9–12, by imine condensation of chiral 1,2-diaminocyclohexane and tri- or tetra(salicylaldehyde) derivatives. CCOF-9, distinguished by its unique C 2 symmetric “armchair” tetrasubstituted pyrene conformation, exhibits the most pronounced chirality among these materials and serves as a solid-state host, enabling the enantioselective adsorption of racemic drugs with an enantiomeric excess (ee) of up to 97%. After substituting diamagnetic zinc(II) ions for paramagnetic cobalt(II), the resulting CCOF-9-Co not only retains its high crystallinity, porosity, and exceptional chirality but also exhibits enhanced conductivity, a crucial factor for the effective observation of CISS. Magnetic conductive atomic force microscopy showed that CCOF-9-Co exhibited a remarkable CISS effect with up to an 88–94% spin polarization ratio. This phenomenon is further confirmed by the increased intensity in the magnetic circular dichroism (MCD) when CCOF-9-Co is under an external magnetic field. This work therefore shows the tremendous potential of CCOFs for controlling spin selectivity and will stimulate the creation of new types of crystalline polymers with strong CISS effects for spin filters.

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Section: Results and Discussionmentioning

confidence: 99%

Covalent Organic Frameworks with Tunable Chirality for Chiral-Induced Spin Selectivity

Han,

Jiang,

Hou

et al. 2024

J. Am. Chem. Soc.

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Chirality‐Induced Memristor of Chiral Nanostructured Half‐Metallic Fe₃O₄ Films

Zhang,

Bai,

Han

et al. 2024

Advanced Materials

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Spintronic memristors, which combine the nonvolatile characteristics of memristors with the scalability of a spin‐transfer torque device, are expected to play a crucial role in advancing quantitative information processing. This field commonly relies on magnetic tunnel junctions, domain wall motion, and spin waves. Here, the discovery of chirality‐induced memristor behavior in chiral nanostructured Fe3O4 films (CNFFs) is reported. These CNFFs are grown on fluorine tin oxide (FTO) substrates using enantiomeric glutamic acid (Glu) as symmetry‐breaking agents and consist of arrays of oriented twisted nanofibers. At 100 K, the L‐CNFF exhibits memristor behavior as a pinched hysteresis loop in the I‐V curve, while the D‐CNFF exhibits semiconductor behavior with constant electrical resistance. The intrinsic spin polarization of half‐metallic Fe3O4 and the chirality‐induced spin selectivity (CISS) are speculated to contribute to the memristor in one handedness of the chiral structure. These findings present a novel spinristor that combines the functions of a memristor and a spin‐filter based on chiral structures, which may promote the development of spintronic devices.

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Chiral electrolytes for rechargeable metal batteries

Wu,

Ning,

Fan

et al. 2025

Journal of Energy Chemistry

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Spin Chiral Anisotropy of Chiral Mesostructured Inorganic Materials with Different Intrinsic Magnetisms

Cited by 6 publications

References 56 publications

Covalent Organic Frameworks with Tunable Chirality for Chiral-Induced Spin Selectivity

Covalent Organic Frameworks with Tunable Chirality for Chiral-Induced Spin Selectivity

Chirality‐Induced Memristor of Chiral Nanostructured Half‐Metallic Fe₃O₄ Films

Chiral electrolytes for rechargeable metal batteries

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Spin Chiral Anisotropy of Chiral Mesostructured Inorganic Materials with Different Intrinsic Magnetisms

Cited by 6 publications

References 56 publications

Covalent Organic Frameworks with Tunable Chirality for Chiral-Induced Spin Selectivity

Covalent Organic Frameworks with Tunable Chirality for Chiral-Induced Spin Selectivity

Chirality‐Induced Memristor of Chiral Nanostructured Half‐Metallic Fe3O4 Films

Chiral electrolytes for rechargeable metal batteries

Contact Info

Product

Resources

About

Chirality‐Induced Memristor of Chiral Nanostructured Half‐Metallic Fe₃O₄ Films