Synthesis and magnetic study for Ga_1 − xMn_xN whiskers

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• 作者：Liu ; Baodan ; Bando ; Yoshio ; Tang ; Chengchun ; Golberg ; Dmitri ; Yamaura ; Kazunari ; Takayama-Muromachi ; Eiji
• 刊名：Chemical Physics Letters
• 出版年：2005
• 出版时间：March 31, 2005
• 年：2005
• 卷：405
• 期：1-3
• 页码：127-130
• 全文大小：405 K

文摘

GaN whiskers with a high content of Mn doping have been synthesized via a simple evaporation process. The microstructures and magnetic properties of the as-synthesized Ga_{1 − x}Mn_xN whiskers were studied by electron microscopy and superconducting quantum interference device (SQUID). The Ga_{1 − x}Mn_xN whiskers were crystalline in the hexagonal structure and had the [2 1 0] direction as the preferential growth direction. The whiskers had diameters of ≈100 nm to several hundred nm and lengths up to tens of micrometers. Magnetic measurements showed that the as-synthesized Ga_{1 − x}Mn_xN whiskers contained two ferromagnetic phases with the Curie temperatures at ≈57 and 325 K. Large coercivity of ≈5000 Oe for the samples was also observed at 5 K.