Suping Song

Publications (3)4.09 Total impact

• Article: Micromagnetic Study of Short and Long Yoke PMR Head With Trailing Shield

  A.F. Torabi, D. Bai, T. Pan, Shaoping Li, Suping Song, Lieping Zhong, Lisha Wang, K. Stoev, Sining Mao
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  ABSTRACT: The response of a trailing shielded perpendicular magnetic recording (PMR) write head with a three-turn two-layer coils is calculated using a full micromagnetic large scale model including return pole and soft underlayer. We study the effect of PMR yoke length and write current overshoot on the dynamic response of the head at high frequency. In particular, recording performance parameter, nonlinear transition shift (NLTS) is simulated using micromagnetic media model. Shorter yoke length head improves NLTS as compared with longer yoke length. Measured NLTS has qualitative agreement with micromagnetic model results.
  IEEE Transactions on Magnetics 12/2008; · 1.36 Impact Factor
• Article: Finite-Element Analysis of Stress Induced Magnetic Anisotropy in Perpendicular Writers

  Suping Song, W. Yu, K. Stoev, D. Bai, Peng Luo, F. Liu
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  ABSTRACT: This paper presents finite-element analysis of the stress-induced magnetic anisotropy in perpendicular magnetic recording (PMR) heads developed during fabrication. The intrinsic stresses of various thin films used in the heads were measured using wafer curvature, while the stress in the yoke region was measured using X-ray diffraction. The measured stresses are provided. The initial strains due to the intrinsic stresses in the films were modeled using equivalent thermal strains and the calculations were verified by correlations with the stress measurements. Finite-element simulations were performed for calculating the stresses in full PMR heads. Detailed simulation procedures are described. Computed results are presented on how sensitive the magnetic anisotropy in the write pole are to the pole tip length and the slider lapping and the compressive stress in overcoat as well as the ambient temperature
  IEEE Transactions on Magnetics 07/2007; · 1.36 Impact Factor
• Article: Finite Element Analysis of Alternating Write-Current-Induced Pole Tip Protrusion in Magnetic Recording Heads

  Suping Song, Lisha Wang, V. Rudman, Dori Fang, K. Stoev, J. Wang, B. Sun
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  ABSTRACT: This paper presents a finite element analysis of alternating write-current-induced pole tip protrusion (WPTP) generated in longitudinal magnetic recording (LMR) heads. An integrated magneto-thermal-mechanical model is developed for the simulations of the electromagnetic Joule heating generated in the LMR writer, the slider temperature distribution, and the slider deformation during writing. The computed results are compared with the experimental measurements in terms of writer resistance and inductance, the WPTP, and temperature rise at reader location. It is found that eddy currents are strongly induced near the surfaces of write poles, while the eddy currents induced in write coils are negligibly weak. The results show that the eddy current loss in the write poles dominates over the Joule heat generated in the write coils. It is also found that the maximum protrusion appears near the write pole in the overcoat and the protrusion profile is sharper than that induced by equivalent direct write current and coil resistance
  IEEE Transactions on Magnetics 07/2007; · 1.36 Impact Factor