Dziwoki Adam, Blyzniuk Bohdana, Freindl Kinga, Madej Ewa, Młyńczak Ewa, Wilgocka-Ślęzak Dorota, Korecki Józef, Spiridis Nika
Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland.
PREVAC sp. z o.o., Raciborska Str. 61, 44-362 Rogów, Poland.
Materials (Basel). 2023 Feb 10;16(4):1485. doi: 10.3390/ma16041485.
Molecular beam epitaxy is widely used for engineering low-dimensional materials. Here, we present a novel extension of the capabilities of this method by assisting epitaxial growth with the presence of an external magnetic field (MF). MF-assisted epitaxial growth was implemented under ultra-high vacuum conditions thanks to specialized sample holders for generating in-plane or out-of-plane MF and dedicated manipulator stations with heating and cooling options. The significant impact of MF on the magnetic properties was shown for ultra-thin epitaxial magnetite films grown on MgO(111). Using in situ and ex situ characterization methods, scanning tunneling microscopy, conversion electron Mössbauer spectroscopy, and the magneto-optic Kerr effect, we showed that the in-plane MF applied during the reactive deposition of 10 nm FeO(111)/MgO(111) heterostructures influenced the growth morphology of the magnetite films, which affects both in-plane and out-of-plane characteristics of the magnetization process. The observed changes are explained in terms of modification of the effective magnetic anisotropy.
分子束外延广泛应用于低维材料工程。在此，我们通过在外部磁场（MF）存在的情况下辅助外延生长，提出了该方法功能的一种新扩展。由于用于产生面内或面外MF的特殊样品架以及具有加热和冷却选项的专用操纵台，在超高真空条件下实现了MF辅助外延生长。对于在MgO(111)上生长的超薄外延磁铁矿薄膜，展示了MF对磁性能的显著影响。使用原位和非原位表征方法、扫描隧道显微镜、转换电子穆斯堡尔谱和磁光克尔效应，我们表明在10 nm FeO(111)/MgO(111)异质结构的反应沉积过程中施加的面内MF影响了磁铁矿薄膜的生长形态，这进而影响了磁化过程的面内和面外特性。观察到的变化是根据有效磁各向异性的改变来解释的。
