Layered structure and related magnetic properties for annealed Fe/Ir(111) ultrathin films

Pei Cheng Jiang, Wei Hsiang Chen, Chen Yuan Hsieh, Jyh-Shen Tsay

研究成果: 雜誌貢獻文章

1 引文 (Scopus)

摘要

After annealing treatments for fcc-Fe/Ir(111) below 600 K, the surface layers remain pseudomorphic. The Ir(111) substrate plays an important role on the expanded Fe lattice. At temperatures between 750 and 800 K, the surface composition shows a stable state and a c(2 × 4) structure is observed. We discover a layered structure composed of some Fe atoms on the top of a Fe0.5Ir0.5 interfacial alloy supported on the Ir(111) substrate. The competition between the negative formation heat of Fe0.5Ir0.5 and surface free energy of Fe causes the formation of layered structure. The existence of ferromagnetic dead layer coincides with the formation of fcc-Fe for ultrathin Fe on Fe0.5Ir0.5/Ir(111). For Fe films thicker than three monolayers, the linear increase of the Kerr intensity versus the Fe coverage is related to the growing of bcc-Fe on the surface where the Fe layer is incoherent to the underlying Fe0.5Ir0.5/Ir(111). These results emphasize the importance of the substrate induced strain and layered structure of Fe/Fe0.5Ir0.5/Ir(111) on the magnetic properties and provide valuable information for future applications.

原文英語
文章編號17B742
期刊Journal of Applied Physics
117
發行號17
DOIs
出版狀態已發佈 - 2015 五月 7

指紋

magnetic properties
heat of formation
thick films
surface layers
free energy
annealing
causes
atoms
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

引用此文

Layered structure and related magnetic properties for annealed Fe/Ir(111) ultrathin films. / Jiang, Pei Cheng; Chen, Wei Hsiang; Hsieh, Chen Yuan; Tsay, Jyh-Shen.

於: Journal of Applied Physics, 卷 117, 編號 17, 17B742, 07.05.2015.

研究成果: 雜誌貢獻文章

Jiang, Pei Cheng ; Chen, Wei Hsiang ; Hsieh, Chen Yuan ; Tsay, Jyh-Shen. / Layered structure and related magnetic properties for annealed Fe/Ir(111) ultrathin films. 於: Journal of Applied Physics. 2015 ; 卷 117, 編號 17.
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