Investigating magnetic proximity effects in NiO/Pd with polarized neutron reflectometry
Investigating magnetic proximity effects in NiO/Pd with polarized neutron reflectometry
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用偏振中子反射计研究 NiO/Pd 中的磁邻近效应
DOI：
10.1103/physrevb.65.024428
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
C. Majkrzak
中科院分区：
文献类型：
--
作者：
A. Hoffmann;M. Fitzsimmons;J. Dura;C. Majkrzak
通过偏振中子反射计，我们研究了 NiO/Pd 异质结构是否存在磁邻近效应，预计该效应会在 Pd 中产生感应铁磁矩。在制备NiO时使用特定的Ni同位素混合物，大大抑制了Pd/NiO界面上的化学对比，从而增强了反射界面处磁对比的灵敏度。尽管灵敏度有所提高，但没有观察到邻近效应的证据。如果存在，每个 Pd 原子的磁矩不能超过 0.01 μB，无论 Pd 层厚度、晶体界面取向和 NiO/Pd 双层的数量如何。
With polarized neutron reflectometry we investigated NiO/Pd heterostructures for the presence of a magnetic proximity effect, which is expected to produce an induced ferromagnetic moment in Pd. Using a specific isotope mixture of Ni in the preparation of NiO, the chemical contrast across the Pd/NiO interface was greatly suppressed, thus enhancing sensitivity to magnetic contrast at the reflecting interface. Despite enhanced sensitivity, no evidence for a proximity effect was observed. If present, the magnetic moment per Pd atom could not be more than 0.01 μ B , regardless of Pd layer thickness, crystalline interface orientation, and number of NiO/Pd bilayers.