强激光与粒子束, 2005, 17 (3): 473, 网络出版: 2006-04-28
离子注入金红石单晶生成的金属Ni纳米晶的磁学性能研究
Magnetic properties of metal Ni nanoparticles prepared by ion implantation in rutile TiO2 single crystals
离子注入 金红石单晶 Ni纳米晶 显微结构 磁学性能 Ion implantation Rutile single crystals Ni nanoparticles Microstructure Magnetic properties
摘要
研究了能量为64 keV、注量1×1017 cm-2的Ni离子注入金红石TiO2单晶制备的植入金属纳米晶的微观结构和磁学性能.注入层的结构和磁学性能采用透射电子显微分析(TEM)和超导量子干涉磁强计(SQUID)进行分析.结果表明,金红石单晶中有尺寸为3～18 nm的金属Ni纳米晶生成,注入区域基体明显非晶化.10 K温度下金属Ni纳米晶的矫顽力约为16.8 kA·m-1,比Ni块材的矫顽力大.样品的零场冷却/有场冷却(ZFC/FC)曲线表明,金属Ni纳米晶的截止温度约为85 K.
Abstract
keV Ni ion implantation of a dose of 1×1017cm-2 was performed at room temperature in rutile TiO2 single crystals in which metallic Ni nanoparticles formed directly. Transmission electron microscopy and a superconducting quantum interference device (SQUID) magnetometer were used to characterize the microstructure and magnetic properties of Ni nanoparticles in TiO2. Metal Ni nanopartilces with size ranging 3~18 nm was observed in the near surface of TiO2. A high-resolution electron microscopy (HREM) image indicated the Ni-implanted area had been entirely amorphized. Magnetic measurement indicated that the coercive force of Ni nanoparticles was about 16.8 kA·m-1 at 10 K, which was larger than that of bulk materials of Ni. The blocking temperature obtained from ZFC/FC curves was about 85 K.
向霞, 祖小涛, 张传飞, 雷家荣, 朱莎, 王鲁闵. 离子注入金红石单晶生成的金属Ni纳米晶的磁学性能研究[J]. 强激光与粒子束, 2005, 17(3): 473. 向霞, 祖小涛, 张传飞, 雷家荣, 朱莎, 王鲁闵. Magnetic properties of metal Ni nanoparticles prepared by ion implantation in rutile TiO2 single crystals[J]. High Power Laser and Particle Beams, 2005, 17(3): 473.
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