Room-temperature magnetic phases of Fe on fcc Co(001) and Ni(001).
Room-temperature magnetic phases of Fe on fcc Co(001) and Ni(001).
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Fe 在 fcc Co(001) 和 Ni(001) 上的室温磁相。
DOI：
10.1103/physrevb.52.15332
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
B. Tonner
中科院分区：
文献类型：
--
作者：
W. O’Brien;B. Tonner
利用x射线磁圆二色性，在fcc Co（001）和Ni（001）上发现了铁的三个不同磁相序列。对于低于5毫升的铁，薄膜是铁磁性的，磁矩垂直于Ni表面生长，平行于Co表面生长。在5到11毫升之间，Fe薄膜在室温下是非磁性的，但在Fe/Co和Fe/Ni界面上包括铁磁性的活单层。磁性活性单层膜的力矩垂直于Ni表面的生长，平行于Co表面的生长。在11ml以上，Fe膜再次具有铁磁性。已知铁在Cu上生长时发生了相同的磁相变序列（001）。基于这种比较和fcc Co、Ni和Cu几乎相同的横向晶格常数，我们得出结论，fcc Co（001）和Ni（001）上的Fe生长遵循与Cu（001）上的Fe生长相同的晶体相变顺序。在Co（001）和Cu（001）上Fe生长的低能电子衍射观察到的相同的表面重构序列支持了这一结论。对于Fe/Ni(001)，没有观察到这些表面结构变化，这表明Fe在Ni上的生长方式的细节与Fe在Co和Cu上的生长方式不同。
A sequence of three distinct magnetic phases of Fe are found for growth on both fcc Co (001) and Ni (001) using x-ray magnetic circular dichroism. For Fe coverages below 5 ML the films are ferromagnetic, with the magnetic moments aligned perpendicular to the surface for growth on Ni and parallel to the surface for growth on Co. Between 5 and 11 ML the Fe films are nonmagnetic at room temperature, but include a ferromagnetic live monolayer at the Fe/Co and Fe/Ni interface. The moment of the magnetically live monolayer is aligned perpendicular to the surface for growth on Ni and parallel to the surface for growth on Co. Above 11 ML the Fe films are once again ferromagnetic. An identical sequence of magnetic phase transitions is known to occur for Fe growth on Cu (001). Based on this comparison and on the nearly identical lateral lattice constants of fcc Co, Ni, and Cu, we conclude that Fe growth on fcc Co (001) and Ni (001) follows the same sequence of crystalline phase transitions as Fe growth on Cu (001). Supporting this conclusion are the identical sequence of surface reconstructions observed by low-energy electron diffraction for Fe growth on Co (001) and Cu (001). For Fe/Ni (001) these surface structural changes are not observed, suggesting that details in the growth mode of Fe on Ni are different for Fe on Co and Cu.