In Heintze et al., Nat. Mater. 12(3), 202 (2013), photo-controlling the switching speed of the magnetization in an Ising-chain molecular magnet was experimentally reported, where a photoinduced domain-wall kick-off mechanism was proposed as the key ingredient. In this paper, we theoretically study the photoinduced spin-lattice dynamics in an organic single-chain-magnet with side radicals. We show that photoexcitations result in two different relaxation dynamics: one is the separated domain-wall pair and the other is the strongly bound self-trapped exciton. These two dynamics can be determinately achieved by photoexciting electrons of different spins. The minimally required light energy/intensity to trigger such nonlinear dynamics can be very low. Moreover, we theoretically devise a novel pure spin transfer from the magnetic chain to the side radicals, a promising mechanism for realizing the photoinduced pure spin current in organic ferromagnetic composites. These results provide the in-depth insight into the photoinduced nonlinear phenomenon in the organic single-chain-magnet and provide new ideas of exploring organic opto-magnetic materials.

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spin transfer organic optomagnetic materials photoinduced pure spin current photoinduced domainwall kickoff mechanism photoinduced spinlattice dynamics separated domainwall ferromagnetic photoinduced nonlinear phenomenon heintze et al nat mater 123 202 isingchain molecular magnet bound magnetic chain side switching speed of the magnetization

Long Long Zhang,Shi Jie Xie,.Nonlinear spin-lattice relaxation of photoexcited organic single-chain-magnet. 8 (7),.

Long Long Zhang,Shi Jie Xie,"Nonlinear spin-lattice relaxation of photoexcited organic single-chain-magnet" 8

Long Long Zhang,Shi Jie Xie,"Nonlinear spin-lattice relaxation of photoexcited organic single-chain-magnet"