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Micromagnetic recording field analysis of fast-switching single-pole-type heads for bit-patterned media |
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| Authors: | Y. Kanai M. Saiki K. Hirasawa T. Tsukamoto K. Yoshida S.J. Greaves H. Muraoka |
| Affiliation: | aNiigata Institute of Technology, 1719 Fujihashi, Kashiwazaki 945-1195, Japan bKogakuin University, 1-24-2 Nishishinjuku, Tokyo 163-8677, Japan cTohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan |
| Abstract: | A Landau–Lifshitz–Gilbert (LLG) micromagnetic analysis of the recording field of single-pole-type (SPT) heads was carried out. The whole volume comprising the SPT head and the double-layered medium was treated micromagnetically using the finite-difference method with cubic cells as small as 5 nm, giving a total number of cells of more than 10.8 million. A parallelized fast Fourier transform (FFT) method was used to solve this large-scale problem. Dynamic recording fields were calculated for various head structures and head materials. The timing (synchronization) between the dynamic head field and land location in bit-patterned media (BPM) is discussed and the design methodology is discussed for a fast-switching SPT head. |
| Keywords: | Perpendicular magnetic recording Single-pole-type (SPT) head LLG micromagnetic analysis Bit-patterned media Parallel computing |
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