REMARKABLE IMPROVEMENT OF THE COERCIVITY OF TbMn6Sn6 COMPOUND BY MELT-SPINNING PROCESS

• 来源期刊: 中国物理(英文版)
• 学科: 物理学
• 关键词: melt-spinning process nanoscale microstructure coercivity
• 年，卷（期）: 2001,（9）
• 所属期刊栏目: CONDENSED MATTER:STRUCTURE,THERMAL AND MECHANICAL
• 页码范围: 869-873
• 页数: 5页
• 分类号: O4
• 语种: 英文

摘要

The melt-spinning process has been carried out to improve the hard-magnetic properties of the TbMn6Sn6 compound. For the TbMn6Sn6 ribbons quenched at a rate of 40m/s and annealed at 545K for 30min, the highest coercivity of about 0.6T is achieved at room temperature, which is much higher than that of the TbMn6Sn6 ingot. Both the ingot and the ribbon coercivities will increase with decreasing temperature. For ribbons, a greater improvement of coercivity has been made at lower temperatures. Microstructural studies show the uniform nanocrystalline distribution in the TbMn6Sn6 ribbons and a small amount of Tb-rich phase in grain boundaries. The observed remarkable improvement of magnetic hardening in ribbons is believed to arise from the uniform nanoscale microstructure and the domain-wall pinning at the grain boundaries.