碳纳米结构中的辐照诱导磁性。

Irradiation-induced magnetism in carbon nanostructures.

作者信息

Talapatra S, Ganesan P G, Kim T, Vajtai R, Huang M, Shima M, Ramanath G, Srivastava D, Deevi S C, Ajayan P M

机构信息

Department of MS & E, Rensselaer Polytechnic Institute, Troy, NY 12180-3590, USA.

出版信息

Phys Rev Lett. 2005 Aug 26;95(9):097201. doi: 10.1103/PhysRevLett.95.097201. Epub 2005 Aug 23.

DOI:10.1103/PhysRevLett.95.097201

PMID:16197243

Abstract

Nitrogen (15N) and carbon (12C) ion implantations with implant energy of 100 keV for different doses were performed on nanosized diamond (ND) particles. Magnetic measurements on the doped ND show ferromagnetic hysteresis behavior at room temperature. The saturation magnetization (M(s)) in the case of 15N implanted samples was found to be higher compared to the 12C implanted samples for dose sizes greater than 10(14) cm(-2). The role of structural modification or defects along with the carbon-nitrogen (C-N) bonding states for the observed enhanced ferromagnetic ordering in 15N doped samples is explained on the basis of x-ray photoelectron spectroscopy measurements.

摘要

对纳米金刚石（ND）颗粒进行了注入能量为100 keV、不同剂量的氮（15N）和碳（12C）离子注入。对掺杂后的ND进行的磁性测量表明，其在室温下呈现铁磁滞回线行为。对于剂量大于10(14) cm(-2) 的情况，发现15N注入样品的饱和磁化强度（M(s)）高于12C注入样品。基于X射线光电子能谱测量结果，解释了15N掺杂样品中观察到的增强铁磁有序性中结构改性或缺陷以及碳氮（C-N）键合状态所起的作用。