Spin-dependent transport and functional design in organic ferromagnetic devices

Abstract

Organic ferromagnets are intriguing materials in that they combine ferromagnetic and organic properties. Although challenges in their synthesis still remain, the development of organic spintronics has triggered strong interest in high-performance organic ferromagnetic devices. This review first introduces our theory for spin-dependent electron transport through organic ferromagnetic devices, which combines an extended Su–Schrieffer–Heeger model with the Green’s function method. The effects of the intrinsic interactions in the organic ferromagnets, including strong electron–lattice interaction and spin–spin correlation between π-electrons and radicals, are highlighted. Several interesting functional designs of organic ferromagnetic devices are discussed, specifically the concepts of a spin filter, multi-state magnetoresistance, and spin-current rectification. The mechanism of each phenomenon is explained by transmission and orbital analysis. These works show that organic ferromagnets are promising components for spintronic devices that deserve to be designed and examined in future experiments.

Platform for High-Spin Molecules: A Verdazyl-Nitronyl Nitroxide Triradical with Quartet Ground State

“…π-Conjugated purely organic high-spin molecules (di-and polyradicals) with substantial intramolecular exchange interactions and intriguing magnetic properties have a significant potential for advanced technological applications and fundamental science. 1,2,3,4,5 The stable di-and polyradicals are considered as working elements of spintronic devices, 6,7,8 multifunctional molecule-based magnetic materials, and quantum machines. 9,10 Guidelines for the design of such high-spin molecules with exchange-coupled stable radical moieties have been developed using MO 11,12,13,14,15 and VB 16,17 theories.…”

A New Approach to Design High Spin Organic Systems: Aromatic Stabilization with Exo‐cyclic π Electrons Plays Crucial Role

“…High spin organic molecules have important applications in diverse fields such as organic magnetic molecules, [1] spintronics, [2,3] magnetic resonance imaging (MRI) contrast agents [4–6] and so on [7–11] . The stability of high spin molecules at ambient condition is crucial for their usefulness.…”

Platform for High-Spin Molecules: A Verdazyl-Nitronyl Nitroxide Triradical with Quartet Ground State

“…π-Conjugated purely organic high-spin molecules (di-and polyradicals) with substantial intramolecular exchange interactions and intriguing magnetic properties have a significant potential for advanced technological applications and fundamental science. 1,2,3,4,5 The stable di-and polyradicals are considered as working elements of spintronic devices, 6,7,8 multifunctional molecule-based magnetic materials, and quantum machines. 9,10 Guidelines for the design of such high-spin molecules with exchange-coupled stable radical moieties have been developed using MO 11,12,13,14,15 and VB 16,17 theories.…”