A－B结构铁磁性超晶格中自旋波局域模与界面模

本文研究了Ａ－Ｂ结构的一维铁磁性超晶格自旋链，利用界面重标度方法，给出了自旋波低能量子严格解．结果表明，超晶格自旋波的本征波函数分为三种类型，其一为非局域模，这种模在Ａ、Ｂ链中的分布几率都较大；其二为局域模，这种模主要分布在Ａ（或Ｂ）链中，而Ｂ（或Ａ）链中的分布几率很小；其三为界面模，这种模在超品格界面处的分布几率报大，离开界面按指数迅速衰减．另外，这三种模具有不同的能量范围．

Confined and Interface Modes of Spin-Waves in Ferromagnetic Superlattices of A-B Structure

he exact solutions of spin-wave modes of a one-dimensional ferromagrietic superlattice spinchain with A-B structure are investigated by use of the interface-rescaling approach. The resultsshow that the spin-wave eigenfunctions in the superlattice have three different types of be-haviour. The first one is unconfined mode which propagates in both chains in the superlattice andthe corresponding eigenfunctions are extended over both chains. The second one is confined modewhich occurs only possible in one of the present crystals ,the spinwave eigenfunctions are mostlyconfined in one type of chain. The third one is interface mode which consists of interface spin-wave for which the eigenmodes are localized at the interface and decay exponentially into the inte-rior of each chain.