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首页> 外文期刊>Physica, B. Condensed Matter >Spin wave relaxation and magnetic properties in [M/Cu] super-lattices; M = Fe, Co and Ni
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Spin wave relaxation and magnetic properties in [M/Cu] super-lattices; M = Fe, Co and Ni

机译：[M / Cu]超晶格中的自旋波弛豫和磁性能; M =铁，钴和镍

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摘要

In this work, we study the elementary excitations and magnetic properties of the [M/Cu] super-lattices with: M = Fe, Co and Ni, represented by a Heisenberg ferromagnetic system with N atomic planes. The nearest neighbour (NN), next nearest neighbour (NNN) exchange, dipolar interactions and surface anisotropy effects are taken into account and the Hamiltonian is studied in the framework of the linear spin wave theory. In the presence of the exchange alone, the excitation spectrum E(k) and the magnetization < S-z >/S analytical expressions are obtained using the Green's function formalism. The obtained relaxation time of the magnon populations is nearly the same in the Fe and Co-based superlattices, while these magnetic excitations would last much longer in the Ni-based super lattice. A numerical study of the surface anisotropy and long-ranged dipolar interaction combined effects are also reported. The exchange integral values deduced from a comparison with experience for the three super-lattices are coherent.
机译：在这项工作中，我们研究了[M / Cu]超晶格的基本激发和磁性能，其中：M = Fe，Co和Ni，由具有N个原子面的Heisenberg铁磁系统表示。考虑了最近邻（NN），次近邻（NNN）交换，偶极相互作用和表面各向异性效应，并在线性自旋波理论的框架内研究了哈密顿量。在单独存在交换的情况下，使用格林函数形式主义获得了激发光谱E（k）和磁化 / S的解析表达式。在Fe和Co基超晶格中，获得的磁振子弛豫时间几乎相同，而在Ni基超晶格中，这些磁激发将持续更长的时间。还报道了表面各向异性和远距离偶极相互作用共同作用的数值研究。通过与三个超晶格的经验比较得出的交换积分值是一致的。

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