Magneto-optic properties of thin EuS/Co and EuS/Cu films on Si(111) substrates
Magneto-optic properties of thin EuS/Co and EuS/Cu films on Si(111) substrates
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Si(111) 衬底上 EuS/Co 和 EuS/Cu 薄膜的磁光特性
DOI：
10.1063/1.1452646
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发表时间：
2002
影响因子：
3.2
通讯作者：
P. Fumagalli
中科院分区：
文献类型：
--
作者：
C. Müller;H. Lippitz;J. Paggel;P. Fumagalli
在300 K下，在Si(111)衬底上外延的Co(111)和Cu(111)表面上生长了5.5 nm和11 nm的EUS薄膜。EUS层以RHEED模式显示体积反射，表明EUS以细小微晶的形式沉积在Co或Cu表面。在300K和10K下，用极化克尔谱研究了样品的磁光性质。在10K下，在1.8 eV和4.2 eV观察到明显的Eu内部4f-5d转变的特征。在1 eV以下，Co层的磁光贡献占主导地位。通过测量随温度变化的克尔谱，研究了Co或Cu层对EUS层磁序的影响。层状结构表现出面内磁各向异性。对300K时顺磁EUS对光谱的贡献的估计表明，EUS膜和Co层之间只有弱耦合。
Thin EuS films of 5.5 and 11 nm have been grown at 300 K on epitaxial Co(111) and Cu(111) surfaces on Si(111) substrates. The EuS layers show volumetric reflections in the RHEED pattern indicating that the EuS is deposited in form of small crystallites on the Co or Cu surface. The magneto-optic properties are investigated by polar Kerr spectroscopy at 300 K and 10 K. At 10 K, a clear signature of the intra-Eu 4f-5d transition is observed at 1.8 eV and at 4.2 eV. Below 1 eV, the magneto-optic contribution of the Co layer is dominant. The influence of the Co or Cu layer on the magnetic ordering of the EuS layer is studied by measuring the Kerr spectra as a function of temperature. The layered structures exhibit an in-plane magnetic anisotropy. Estimates of the paramagnetic EuS contribution to the spectrum at 300 K suggest only a weak coupling between the EuS film and the Co layer.