本文研究了由交换作用耦合起来的有限长铁磁和反铁磁链组成的自旋系统。
The system of spins in a finite ferromagnetic-antiferromagnetic chain, coupled by exchange interaction, is investigated.
这个方案是在赫伯德模型中研究反铁磁（AFM）自旋涨落调制的电子-电子耦合。
The scenario is explored in Hubbard model including electron-electron couplings mediated by antiferromagnetic(AFM) spin fluctuation .
结果表明，不同构象下各体系有效交换积分值都小于零，自由基间表现为反铁磁性耦合。
The results show that the effective exchange integral values are less than zero under different conformations, so the radicals display the anti-ferromagnetic coupling.
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