Mandal Madhuri, Das Bipul, Mandal Kalyan
Material Science Division, S.N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700 098, India.
J Colloid Interface Sci. 2009 Jul 1;335(1):40-3. doi: 10.1016/j.jcis.2009.03.011. Epub 2009 Mar 28.
Among many ferromagnetic materials, CoPt alloy nanoparticles with high coercivity and small grain size are one of the potential candidates having its application in high-density storage media manufacturing. CoPt alloy nanoparticles of different compositions have been prepared in TX-100 micellar medium and capped with sodium oleate to prevent the agglomeration during annealing at high temperature. Their structural and magnetic properties were investigated before and after heat treatment. The particles with approximately 50:50 compositions of Co and Pt gives L1(0) phase after annealing at 900 degrees C for 1 h and show a high coercivity (approximately 4.4 kOe at room temperature) and remanence due to its highly anisotropic L1(0) structure.
在众多铁磁材料中，具有高矫顽力和小晶粒尺寸的CoPt合金纳米颗粒是有望应用于高密度存储介质制造的候选材料之一。在TX - 100胶束介质中制备了不同成分的CoPt合金纳米颗粒，并用油酸钠进行包覆，以防止高温退火过程中的团聚。对热处理前后的结构和磁性进行了研究。Co和Pt组成比例约为50:50的颗粒在900℃退火1小时后形成L1(0)相，由于其高度各向异性的L1(0)结构，显示出高矫顽力（室温下约4.4 kOe）和剩磁。
