Atomically Thin Transition-Metal Dinitrides: High-Temperature Ferromagnetism and Half-Metallicity

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• 作者：Fang Wu ; Chengxi Huang ; Haiping Wu ; Changhoon Lee ; Kaiming Deng ; Erjun Kan ; Puru Jena
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：December 9, 2015
• 年：2015
• 卷：15
• 期：12
• 页码：8277-8281
• 全文大小：389K
• ISSN：1530-6992

文摘

High-temperature ferromagnetic two-dimensional (2D) materials with flat surfaces have been a long-sought goal due to their potential in spintronics applications. Through comprehensive first-principles calculations, we show that the recently synthesized MoN₂ monolayer is such a material; it is ferromagnetic with a Curie temperature of nearly 420 K, which is higher than that of any flat 2D magnetic materials studied to date. This novel property, made possible by the electron-deficient nitrogen ions, render transition-metal dinitrides monolayers with unique electronic properties which can be switched from the ferromagnetic metals in MoN₂, ZrN₂, and TcN₂ to half-metallic ones in YN₂. Transition-metal dinitrides monolayers may, therefore, serve as good candidates for spintronics devices.