Superlattice of Single Atom Magnets on Graphene

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• 作者：Romana Baltic ; Marina Pivetta ; Fabio Donati ; Christian Wäckerlin ; Aparajita Singha ; Jan Dreiser ; Stefano Rusponi ; Harald Brune
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：December 14, 2016
• 年：2016
• 卷：16
• 期：12
• 页码：7610-7615
• 全文大小：430K
• ISSN：1530-6992

文摘

Regular arrays of single atoms with stable magnetization represent the ultimate limit of ultrahigh density storage media. Here we report a self-assembled superlattice of individual and noninteracting Dy atoms on graphene grown on Ir(111), with magnetic hysteresis up to 5.6 T and spin lifetime of 1000 s at 2.5 K. The observed magnetic stability is a consequence of the intrinsic low electron and phonon densities of graphene and the 6-fold symmetry of the adsorption site. Our array of single atom magnets has a density of 115 Tbit/inch², defined by the periodicity of the graphene moiré pattern.