2007 年 31 巻 6 号 p. 427-434
Landau-Lifshitz-Gilbert (LLG) micromagnetic recording field analysis of a single-pole-type (SPT) head using a parallelized program with a PC cluster system is investigated. The use of a PC cluster system allows dynamic calculations of SPT write head models with cells 10 nm a side. An 8-CPU system realized a calculation speed 30 times faster than the original program, which used a 64-bit single processor system. The dc and dynamic recording fields are investigated for various pole tip structures and material characteristics. First, the dc (quasi-static) recording fields are compared for LLG and FEM calculations. Next, it is shown that an optimum non-zero throat height exists that maximizes recording field strength. The addition of a trailing shield is found to be effective for obtaining a larger recording field gradient. Dynamic recording fields are also derived for various head structures and materials.