Highly Durable Spin Filter Switching Based on Self-Assembled Chiral Molecular Motor.

Area of Science:

• Organic spintronics
• Molecular electronics
• Chiral materials science

Background:

• Chiral molecules exhibit chiral-induced spin selectivity (CISS), enabling spin-selective charge emission.
• Current CISS applications face challenges in external spin control, durability, and efficiency.
• Organic chiral materials offer potential for novel solid-state spintronic devices.

Purpose of the Study:

• To address fundamental obstacles in chiral-induced spin selectivity (CISS).
• To develop a system for external control, durability, and improved spin-polarization efficiency.
• To demonstrate the feasibility of advanced CISS-based spintronic devices.

Main Methods:

• Development of a self-assembled monolayer (SAM) using overcrowded alkene (OCA)-based molecular motors.
• Utilizing covalent bond formation between molecules and electrodes for stability.
• Tailoring SAM architecture by mixing OCAs with alkanethiols to enhance stereo-ordering.

Main Results:

• Demonstrated external and repeatable manipulation of spin polarization direction by switching molecular chirality.
• Achieved extremely stable spin polarization control through covalent bonding.
• Showed that enhanced stereo-ordering of OCA SAMs significantly boosts spin polarization efficiency per molecule.

Conclusions:

• The developed OCA-based molecular motor system provides a viable solution for CISS device challenges.
• Findings support the feasibility of developing spintronic devices with controllable, durable, and highly efficient spin polarization.
• This work paves the way for advanced organic spintronics utilizing chiral-induced spin selectivity.