Introduction to Micromagnetic Recording Physics

  • Jan van Ek
  • Martin Plumer
Part of the Springer Series in Surface Sciences book series (SSSUR, volume 41)


Extremely effective reduction of physical dimensions in the recording head through photolithography techniques, in combination with tremendous development in thin film recording media, has led to a spectacular increase in areal density in the magnetic recording industry. Since the fundamental length scale (exchange length) in ferromagnetic materials is on the order of 10-8 meter, the small physical dimensions have made more detailed micromagnetic analysis of the recording head and the recorded data track feasible: The number of discretisation elements required in the numerical simulation of objects with small dimensions is now of a manageable size. The intent of this Chapter is to provide an elementary introduction to aspects of magnetostatics, leading up to popular implementations of the micromagnetic method. This also serves as a background to many of the concepts discussed in the subsequent chapters in this book. Examples of the application of simple magnetostatic equations and of the micromagnetic method to the recording head and medium will serve to illustrate the utility of the micromagnetic method, as well as some of its shortcomings.


Spin Valve Free Layer Stray Field Sensor Height Track Edge 
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  1. 1.
    R. M. White, Introduction to Magnetic Recording, 1st ed. (IEEE Press, New York, 1985)Google Scholar
  2. 2.
    C. D. Mee, E. D. Daniel, Magnetic Recording, Volume 1: Technology, 1st ed. (McGraw-Hill, New York, 1987)Google Scholar
  3. 3.
    J. C. Mallinson, The Foundations of Magnetic Recording, 2nd ed. (Academic Press, San Diego, 1993)Google Scholar
  4. 4.
    H. N. Bertram, Theory of Magnetic Recording, 1st ed. (Cambridge Univ. Press, Cambridge, 1994)CrossRefGoogle Scholar
  5. 5.
    J. C. Mallinson, Magneto-resistive Recording Heads, 1st ed. (Academic Press, San Diego, 1996)Google Scholar
  6. 6.
    K. G. Ashar, Magnetic Disk Drive Technology, 1st ed. (IEEE Press, New York, 1997)Google Scholar
  7. 7.
    R. L. Comstock, Magnetism and Magnetic Recording, 1st ed. (Wiley, New York, 1999)Google Scholar
  8. 8.
    E. M. Williams, Design and Analysis of Magnetoresistive Recording Heads, 1st ed. (Wiley, New York 2001)Google Scholar
  9. 9.
    J. D. Jackson, Classical Electrodynamics, 2nd ed. (Wiley, New York 1975)zbMATHGoogle Scholar
  10. 10.
    M. Mansuripur, R. Giles, IEEE Trans. Magn. 24, 2326 (1988)ADSCrossRefGoogle Scholar
  11. 11.
    M. R. Scheinfein, J. Unguris, J. L. Blue, K. J. Coakley, D. T. Pierce, R. J. Celotta, P. Ryan, Micromagnetics of Domain Walls at Surfaces, Phys. Rev. B 43, 3395 (1991)ADSCrossRefGoogle Scholar
  12. 12.
    S. Yuan, Micromagnetics of Domains and Walls in Soft Ferromagnetic Materials, Ph.D. Dissertation, University of CaHfornia, San Diego (1992)Google Scholar
  13. 13.
    W. F. Brown: Micromagnetics, Reprint (Krieger Publishing Company, Hintington 1978)Google Scholar
  14. 14.
    G. F. Hughes, Magnetisation Reversal in Cobalt-phosphorous films, J. Appl. Phys. 54, 5306 (1983)ADSCrossRefGoogle Scholar
  15. 15.
    C. Kittel, Introduction to Solid State Physics, 5th ed. (Wiley New York 1976)Google Scholar
  16. 16.
    J. L. Blue, M. R. Scheinfein, Using Multipoles Decreases Computation Time for Magnetostatic Self-Energy IEEE Trans. Magn. 27, 4778 (1991)CrossRefGoogle Scholar
  17. 18.
    W. K. Hiebert, A. Stankiewicz, M. R. Freeman, Direct observation of Magnetic Relaxation in a Small Permalloy Disk by Time-Resolved Scanning Kerr Microscopy, Phys. Rev. Lett. 79, 1134 (1997)ADSCrossRefGoogle Scholar
  18. 19.
    R. H. Koch et al., Magnetization Reversal in Micron-Sized Magnetic Thin Films, Phys. Rev. Lett. 81, 4512 (1998)ADSCrossRefGoogle Scholar
  19. 20.
    G. M. Sandler, H. N. Bertram, T. J. Silva, T. M. Crawford, Determination of the Magnetic Damping Constant in NiFe Films, J. Appl. Phys. 85, 5080 (1999)ADSCrossRefGoogle Scholar
  20. 21.
    T. J. Silva, T, M. Crawford, Methods for Determination of Response Times of Magnetic Head Materials, IEEE Trans. Magn. 2, 671 (1999)ADSCrossRefGoogle Scholar
  21. 22.
    T. J. Silva, C. S, Lee, T. M. Crawford, C. T. Rogers, Inductive Measurement of Ultrafast Magnetisation Dynamics in Thin-film Permalloy, J. Appl, Phys. 85, 7849 (1999)ADSCrossRefGoogle Scholar
  22. 23.
    D. A. Lindholm, Magnetic Fields of Finite Track Width Heads, IEEE Trans. Magn. MAG-13, 1460 (1977)Google Scholar
  23. 24.
    J. van Ek, M. L. Plumer, H. Zhou, H. N. Bertram, Micromagnetic Recording Model of Pole Tip Saturation Effects, IEEE Trans. Magn. 36, 3975 (2000)Google Scholar
  24. 25.
    C. Y. Mao, J.-G. Zhu, R. M. White, T. Min, Effect of Damping on the Switching Limit of a Thin Film Recording Head, J. Appl. Phys. 85, 5870 (1999)ADSCrossRefGoogle Scholar
  25. 26.
    K. Gao, H. N. Bertram: Three Dimensional Micromagnetic Analysis of Write Dynamics and Field Patterns, to be published in IEEE Trans. Magn. (2001)Google Scholar
  26. 27.
    G. M. Sandler, H. N. Bertram, Micromagnetic Simulations with Eddy Currents of Rise Time in Thin Film Heads, J. Appl. Phys. 81, 4513 (1997)ADSCrossRefGoogle Scholar
  27. 28.
    G. M. Sandler, Computational Analysis of Magnetisation Dynamics in Thin Film Write Heads, Ph.D. Dissertation, University of California, San Diego (1998)Google Scholar
  28. 29.
    R. M. Bozorth: Ferromagnetism, (IEEE Press, New York, 1993)CrossRefGoogle Scholar
  29. 30.
    B. A. Gurney et al., Can Spin Valves be Rehably Deposited for Magnetic Recording Applications?, J. Appl. Phys. 81, 3998 (1997)ADSCrossRefGoogle Scholar
  30. 31.
    M.L. Plumer and J. van Ek, Micromagnetic Study of Track Edge and Medium Orientation Effects in High Areal Density Recording, IEEE Trans. Magn. (Intermag 2000)Google Scholar
  31. 32.
    M. L. Plumer, J. van Ek, Micromagnetic Recording Model of Pole-Tip Saturation and Medium Orientation Effects at 100 Gb/in2, IEEE Trans. Magn. (Intermag 2001)Google Scholar
  32. 33.
    H. Zhou and H. N. Bertram, Micromagnetic Study of Longitudinal Thin Film Media: Effect of Grain Size Distribution, IEEE Trans. Magn. 35, 2712 (1999)ADSCrossRefGoogle Scholar
  33. 34.
    H. Zhou and H. N. Bertram, Micromagnetic Analysis of Anisotropy Orientation on Recording Performance in Longitudinal Thin Film Media, J. Appl. Phys 87, 5675 (2000)ADSCrossRefGoogle Scholar

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© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • Jan van Ek
  • Martin Plumer

There are no affiliations available

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