4.7 Article

Sm cluster on hexagonal boron nitride supported by Ir(111): Formation of magnetic cluster superlattice Sm13@h-BN|Ir(111)

期刊

APPLIED SURFACE SCIENCE
卷 604, 期 -, 页码 -

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ELSEVIER
DOI: 10.1016/j.apsusc.2022.154478

关键词

Rare earth cluster; Cluster superlattice

资金

  1. National Natural Science Founda-tion of China [11874306, 12174320]
  2. Natural Science Foun-dation of Chongqing, China [cstc2021jcyj-msxmX0209, cstc2022ycjh-bgzxm0127]

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The study found that depositing magnetic Sm-13 clusters on a specific template can form a cluster superlattice with high magnetism, which can be used for magnetic storage.
The goal toward the ultimate density limit of magnetic information storage is now focused on the creations of identical magnetic clusters as well as their arrangements on a template surface for obtaining an equidistant, monodisperse and equally oriented pattern. To achieve this goal, the combination of rare-earth (RE) cluster and specific template is a viable route, e.g., h-BN monolayer on Ir(111) surface within a corrugated moire structure (h-BN|Ir(111)) can act as a promising template to steer the intrinsically magnetic RE cluster in a well-defined orientation. Combining ab inito molecular dynamic (AIMD) simulation and spin-orbital coupling density function theory (DFT) calculations, we report that magnetic Sm-13 cluster can be stably deposited at the pore region of h-BN|Ir(111) template. The low-lying moire region potential of h-BN|Ir(111) template, stable icosahedron structure of Sm-13 cluster, and strong hybridization of Sm-5d6s orbitals with B/N-sp orbitals, play the synergetically roles to form Sm-13@h-BN|Ir(111) cluster superlattice. The local magnetic moments of Sm atoms in Sm-13 cluster are found to be robust against the structural configuration, localized site and inter-atom magnetic coupling, because their highly localized 4f states hybridize less with the spd states. Nevertheless, different deposition orientations and consequently the altered bonding interactions between Sm atoms and h-BN monolayer lead to different magnetic orders among Sm atoms. The appearances of large magnetic moment and giant magnetic anisotropy energy (MAE) of Sm-13 cluster as well as its high deposition stability render Sm-13@h-BN|Ir(111) for potential application of magnetic storage.

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