Element-specific study of epitaxial NiO/Ag/CoO/Fe films grown on vicinal Ag(001) using photoemission electron microscopy

Element-specific study of epitaxial NiO/Ag/CoO/Fe films grown on vicinal Ag(001) using photoemission electron microscopy
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使用光电子显微镜在邻位 Ag(001) 上生长的外延 NiO/Ag/CoO/Fe 薄膜的元素特异性研究

DOI:
10.1063/1.3595274
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发表时间:
2011-05
期刊:
Appl. Phys. Lett. 98, 212508 (2011);
影响因子:
--
通讯作者:
Y. Meng
Y. Meng
中科院分区:
其他
文献类型:
--
作者:
Y. Meng

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采用分子束外延技术在邻位Ag(001)衬底上生长了NiO/Ag/CoO/Fe单晶薄膜,并对其进行了光电子发射电子显微镜研究。我们发现,零场冷却后,在平面内的Fe磁化切换从平行于相邻表面的原子台阶的方向在较薄的CoO厚度,但保持在其原来的方向平行于步骤在较厚的CoO厚度。CoO和NiO畴成像结果表明,CoO/Fe和NiO/CoO的自旋都是垂直耦合的,表明Fe的磁化翻转可能与CoO薄膜的自旋自旋可冻结转变有关.
NiO/Ag/CoO/Fe single crystalline films are grown epitaxially on a vicinal Ag(001) substrate using molecular beam epitaxy and investigated by photoemission electron microscopy. We find that after zero-field cooling, the in-plane Fe magnetization switches from parallel to perpendicular direction of the atomic steps of the vicinal surface at thinner CoO thickness but remains in its original direction parallel to the steps at thicker CoO thickness. CoO and NiO domain imaging result shows that both CoO/Fe and NiO/CoO spins are perpendicularly coupled, suggesting that the Fe magnetization switching may be associated with the rotatable-frozen spin transition of the CoO film.
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