Exchange-coupled perpendicular media
Exchange-coupled perpendicular media
复制标题
DOI：
10.1016/j.jmmm.2008.06.041
复制
发表时间：
2008-05
影响因子：
2.7
通讯作者：
D. Suess;Jehyun Lee;J. Fidler;T. Schrefl
中科院分区：
文献类型：
--
作者：
D. Suess;Jehyun Lee;J. Fidler;T. Schrefl
本文综述了交换弹簧双层膜和梯度介质的研究进展。梯度介质优化的分析模型给出了最佳的磁化强度值Js=0.8T。最佳设计允许具有3.3nm量级的热稳定晶粒，其支持高达5- 10 Tbit/in 2的超高密度。与单相介质相比，双层介质和梯度介质中的开关场分布显著减小。对于梯度介质的开关场分布减少了约2倍。对于双层介质，软层各向异性约为硬层各向异性的五分之一，得到最小开关场分布。详细研究了旋进开关对磁性双层膜反转时间和反转场的影响。交换弹簧双层膜可以用20 ps的场脉冲反转。
The potential of exchange spring bilayers and graded media is reviewed. An analytical model for the optimization of graded media gives an optimal value of the magnetic polarization of Js=0.8T. The optimum design allows for thermally stable grains with grain diameters in the order of 3.3nm, which supports ultra-high density up to 5–10Tbit/in2. The switching field distribution is significantly reduced in bilayer media and graded media compared to single-phase media. For the graded media the switching field distribution is reduced by about a factor of two. For bilayer media the minimum switching field distribution is obtained for soft-layer anisotropies that are about one fifth of the hard-layer anisotropy. The influence of precessional switching on the reversal time and the reversal field is investigated in detail for magnetic bilayers. Exchange spring bilayers can be reversed with field pulses of 20ps.