Organic-based magnon spintronics

Abstract

Magnonics concepts utilize spin-wave quanta (magnons) for information transmission, processing and storage. To convert information carried by magnons into an electric signal promises compatibility of magnonic devices with conventional electronic devices, that is, magnon spintronics . Magnons in inorganic materials have been studied widely with respect to their generation, transport and detection . In contrast, resonant spin waves in the room-temperature organic-based ferrimagnet vanadium tetracyanoethylene (V(TCNE) (x ≈ 2)), were detected only recently . Herein we report room-temperature coherent magnon generation, transport and detection in films and devices based on V(TCNE) using three different techniques, which include broadband ferromagnetic resonance (FMR), Brillouin light scattering (BLS) and spin pumping into a Pt adjacent layer. V(TCNE) can be grown as neat films on a large variety of substrates, and it exhibits extremely low Gilbert damping comparable to that in yttrium iron garnet. Our studies establish an alternative use for organic-based magnets, which, because of their synthetic versatility, may substantially enrich the field of magnon spintronics.

Emergence of Multispinterface and Antiferromagnetic Molecular Exchange Bias via Molecular Stacking on a Ferromagnetic Film

“…Organic molecular films are traditional van der Waals materials composed of π‐conjugated carbon‐based elements. Countless variation of these molecules together with long spin coherence due to light constitute atoms boosted recent move to molecular/organic spintronics . However, their most attractive and unexplored advantage could be well‐balanced intra/intermolecular coupling that is not so homogeneous like metal but has well‐established intramolecular coupling and weak but fairly stable interlayer coupling.…”

Chemical Modification toward Long Spin Lifetimes in Organic Conjugated Radicals

“…Herein, we study the molecular design and spin relaxation mechanisms by systematically varying the structure of a conjugated radical. [8][9][10] Understanding the mechanism for spin relaxation is a key factor to realize spin-based applications using OSCs. We demonstrate that substitution of a lower gyromagnetic ratio nucleus (e. g. D, Cl) on the para-position of the aryl rings in the triphenylmethyl (TM) radical can significantly improve their coherence times (T m ).…”

“…[7] These features endow OSCs promising materials for spin-related information transmission, processing, and storage. [8][9][10] Understanding the mechanism for spin relaxation is a key factor to realize spin-based applications using OSCs. [11,12] The electron spin relaxation can be assigned into two aspects: the exchange of energy with the spin's environment (the 'lattice') which is characterized by the spin-lattice relaxation time (T 1 ) and spin dephasing which is characterized by the coherence time (T m ).…”

Spin wave excitations of magnetic metalorganic materials

“…In particular metal organic frameworks and organic molecular crystals exhibit promising structures for electron-spin-based devices. Magnetic organics have attracted attention with respect to spintronic devices [1][2][3] and magnon spintronics [4], multiferroic phases [5,6], molecular qubits [7,8], and spin-liquid physics [9][10][11]. Local magnetic moments in organic materials can arise due to transition metal and rare earth ions embedded in the molecules or due to local unsaturized bonds as they occur in stable organic radicals [12][13][14].…”