11 May 2018 Spin relaxation and diffusion in disordered organic solids
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Organic spintronics has been an active research field since the demonstration of large magnetoresistance in a thick organic spin valve, in which carrier spins are injected into the organic film sandwiched between two ferromagnetic electrodes. In such spin-injection devices, spin relaxation time and spin diffusion length are key properties that control spin-dependent transport and dictate the device design. Here, we compare spin relaxation and diffusion behaviors in organic solids due to spin-dependent interactions including spin-orbit coupling (SOC), hyperfine interaction (HFI), and exchange. It is found that for SOC-induced spin relaxation, the spin diffusion length is essentially determined by the spin admixture parameter and insensitive to magnetic field and carrier hopping rate, whereas for HFI-induced spin relaxation, it increases rapidly with both the magnetic field and hopping rate. In devices with high-density carriers, where exchange-induced spin motion dominates over carrier hopping, the spin diffusion length is limited by SOC.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Zhi-Gang Yu, Zhi-Gang Yu, } "Spin relaxation and diffusion in disordered organic solids," Journal of Photonics for Energy 8(3), 032213 (11 May 2018). https://doi.org/10.1117/1.JPE.8.032213 . Submission: Received: 17 January 2018; Accepted: 20 April 2018
Received: 17 January 2018; Accepted: 20 April 2018; Published: 11 May 2018


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