Spin-resolved appearance potential spectroscopy investigations on Fe/Cu(001) overlayers
Spin-resolved appearance potential spectroscopy investigations on Fe/Cu(001) overlayers
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Fe/Cu(001) 覆盖层的自旋分辨表观势能谱研究
DOI：
10.1103/physrevb.61.15241
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发表时间：
2000
影响因子：
3.7
通讯作者：
M. Donath
中科院分区：
文献类型：
--
作者：
V. Popescu;H. Ebert;L. Szunyogh;P. Weinberger;M. Donath
最近开发的用于处理块状过渡金属体系的自旋分辨外观势能谱（SR-APS）的理论描述已扩展到${\mathrm{Fe}}_{n}/\mathrm{Cu}(001)的自由表面。$先前对Cu(001)衬底顶部的fcc-Fe的实验工作结果被解释为表明在非铁磁性Fe层顶部共存了一些铁磁耦合的Fe层$T=110$ K。另一方面，最近的理论工作发现 $ng2$ 该系统的基态对应于反铁磁耦合的 Fe 层。为了澄清这种情况，假设亚稳态铁磁（FM）和反铁磁（AFM）配置，计算了 ${\mathrm{Fe}}_{n}/\mathrm{Cu}(001)$ 的 SR-APS 谱。虽然 FM 配置与实验存在明显偏差，但 AFM 基态配置获得了近乎完美的一致性。这意味着实验SR-APS光谱与理论预测并不冲突，相反，它们强烈支持它。
The theoretical description of spin-resolved appearance potential spectroscopy (SR-APS) developed recently to deal with bulk transition-metal systems has been extended to free surfaces of ${\mathrm{Fe}}_{n}/\mathrm{Cu}(001).$ Results of previous experimental work on fcc-Fe on top of a Cu(001) substrate were interpreted to indicate the coexistence of a few ferromagnetically coupled Fe layers on top of nonferromagnetic Fe layers for $T=110$ K. Recent theoretical work, on the other hand, found for $ng2$ that the ground-state of this system corresponds to antiferromagnetically coupled Fe layers. In order to clarify this situation the SR-APS spectra of ${\mathrm{Fe}}_{n}/\mathrm{Cu}(001)$ have been calculated assuming the metastable ferromagnetic (FM) as well as antiferromagnetic (AFM) configuration. While for the FM configuration pronounced deviations from experiment were found, a nearly perfect agreement was obtained for the AFM ground-state configuration. This means that the experimental SR-APS spectra are not in conflict with the theoretical prediction but, on the contrary, they strongly support it.