With an Anderson-like model including electron-electron interaction and electron-lattice interaction, the effect of external electric field on the electric and magnetic properties of quasi-one-dimensional organic ferromagnets is investigated theoretically. The results demonstrate a field-induced magnetism decline of the organic ferromagnet, which manifests a continuous decrease of the total molecular spin and suppression of the spin density wave after a critical field. The analysis of energy band evolution under the field indicates that the field-induced energy levels crossover of the spin-split flat bands is responsible for the magnetism decline. A companied charge polarization and charge transfer between spin radicals and main chain in the OF are observed. Different strength of the internal interactions including electron-electron interaction, hopping integral between radicals and main chain, and electron-lattice interaction is discussed. This work is helpful to understand the property of organic ferromagnets under external field in the situation of organic-ferromagnetic devices.

利用包括电子-电子相互作用和电子-晶格相互作用的类安德森模型，理论上研究了外部电场对准一维有机铁磁体的电和磁性能的影响。结果表明，有机铁磁体的场致磁性下降，这表明在临界场之后，总分子自旋不断降低，自旋密度波受到抑制。磁场下能带演化的分析表明，自旋分裂平坦带的场诱导能级交叉是磁性下降的原因。观察到OF中自旋自由基与主链之间伴随着电荷极化和电荷转移。内部相互作用的强度不同，包括电子-电子相互作用，讨论了自由基与主链之间的跳跃积分，以及电子-晶格相互作用。这项工作有助于理解有机铁磁器件情况下有机铁磁体在外场作用下的特性。