秦高梧
,
及川胜成
材料与冶金学报
doi:10.3969/j.issn.1671-6620.2005.02.024
目前Co-Cr基合金硬盘磁记录介质因其磁诱发相分离的富Co铁磁相,与富Cr非铁磁相组成的特殊组织形态和较高的磁晶各向异性能,使得实际的磁记录面密度已达到了水平记录模式的理论极限(～100 Gbit/in2),而将来超高密度磁记录技术(几百Gbi/in2～1 Tbit/in2)要求介质具有孤立的磁晶粒和更高的磁晶各向异性能.我们的实验结果表明,Co-Mo(W)合金具有比Co-Cr合金更高的磁晶各向异性能,特别是热力学计算预测了这两个系统发生磁诱发相分离的可能性,其组织能满足未来超高密度磁记录的要求.对Co-Mo(W)合金薄膜的TEM-EDX分析支持了这种理论计算结果.不过这两个体系相分离程度的不充分限制了它们的直接应用.本文对这种不充分相分离的成因进行了详细讨论,并提出了对其改善的途径.
关键词:
磁记录介质
,
磁诱发相分离
,
Co-Cr Co-Mo
,
Co-W
Gaowu QIN
金属学报(英文版)
doi:10.1016/S1006-7191(08)60117-9
Co-X(X=Cr, Mo, W) magnetic thin films were prepared by using DC magnetron sputtering, and their structures were examined by using X-ray diffraction (XRD). The amorphous forming ability (AFA) of the three alloy systems was discussed based on thermodynamic calculation and experiments. The results show that the Co-Mo thin films exhibit the largest AFA among them, and the Co-W thin films are condition-dependent amorphous while the Co-Cr thin films are hard to be amorphous, which is consistent with the thermodynamic calculation. The difference in AFA for the alloys of these three systems is finally ascribed to three main factors: differences in electronegativity, electron density and atomic size between Co and X elements.
关键词:
Amorphous forming ability
,
Co-Cr
,
Co-Mo
,
Co-W
