“…Magnetic metal nanomaterials such as Fe, Co and Ni have attracted much attention due to their excellent properties and potential applications in high-density magnetic recording [1], sensors [2], catalysis [3,4] and so on. Therefore, much effort has been made to synthesize these transition metals, including hydrogen arc plasma [5], borohydride reduction of metal salts [6,7], gamma-ray irradiation [8,9], template synthesis [10][11][12][13] and so forth.…”