Metal-Free Organic Radical Spin Source

Abstract

Organic radicals have long been suggested as candidates for organic magnets and components in organic spintronic devices. Herein, we demonstrate spin current emission from an organic radical film via spin pumping at room temperature. We present the synthesis and the thin film preparation of a Blatter-type radical with outstanding stability and low roughness. These features enable the fabrication of a radical/ferromagnet bilayer, in which the spin current emission from the organic radical layer can be reversibly reduced when the ferromagnetic film is brought into simultaneous resonance with the radical. The results provide an experimental demonstration of a metal-free organic radical layer operating as a spin source, opening a new avenue for the development of purely organic spintronic devices and bridging the gap between potential and real applications.

Cryptochrome and quantum biology: unraveling the mysteries of plant magnetoreception

“… Amdur et al, (2022) investigated this control to discover a room temperature molecular qubit, highlighting the potential of molecular electronic spins as a novel platform for qubit structure and control. Additionally, the study by Nicolaides et al. (2023) provides insights into spin pumping from organic radical films, presenting another avenue to explore.…”

“…Amdur et al, (2022) investigated this control to discover a room temperature molecular qubit, highlighting the potential of molecular electronic spins as a novel platform for qubit structure and control. Additionally, the study by Nicolaides et al (2023) provides insights into spin pumping from organic radical films, presenting another avenue to explore. They demonstrated spin current emission from a Blattertype radical with outstanding stability and low roughness, indicating the possibility of realizing spin pumping even in the absence of long-range ferromagnetic order (Nicolaides et al, 2023).…”

“…Additionally, the study by Nicolaides et al (2023) provides insights into spin pumping from organic radical films, presenting another avenue to explore. They demonstrated spin current emission from a Blattertype radical with outstanding stability and low roughness, indicating the possibility of realizing spin pumping even in the absence of long-range ferromagnetic order (Nicolaides et al, 2023). These approaches, along with the deposition of highly-ordered arrays on solid surfaces to create 2D-lattices and doping with controlled amounts of spin-free radicals, can contribute to solving the rapid spin relaxation issue and foster the development of suitable molecular qubits with potential industrial applications (Xu and Ping, 2023).…”

Temperature-Dependent Antiferromagnetic Exchange along 1D Linear Regular Chains of the Phthalonitrile Blatter Radical

“…65 Thin films based on Blatter-type radicals can act as metal-free spin-sources in purely organic spintronic devices. 66 Blatter radicals can also be used as polarizing agents of Overhauser DNP for high-field MAS-DNP. 67,68 The application of Blatter radicals in cutting-edge devices requires the development of "structure−activity" relationships.…”

“…1D ferromagnetism and antiferromagnetism have been reported ,,,− along with two examples of magnetic-bistability associated with a first-order structural phase transition. , Blatter radicals have been used in chemical synthesis as initiators in controlled polymerizations, − as ligands in coordination complexes with paramagnetic metals − and metal–organic frameworks (MOFs), and as building units in diradicals and biradicaloids. ,, Their optical properties stem from their low-lying SOMO orbital and include weak fluorescence, photodetection, , and liquid crystalline photoconduction. − Blatter radicals have also been incorporated in electroactive polymers as components of purely all-organic batteries. ,− It has been demonstrated that they can form stable thin films without significant degradation while retaining their paramagnetic character. , Several recent studies , have examined the Blatter radical/inorganic “spinterface” and their possible applications in spintronic devices . Thin films based on Blatter-type radicals can act as metal-free spin-sources in purely organic spintronic devices . Blatter radicals can also be used as polarizing agents of Overhauser DNP for high-field MAS-DNP. , …”