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Faster magnetic walls in rough wires

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Abstract

In some magnetic devices that have been proposed, the information is transmitted along a magnetic wire of submicrometre width by domain wall (DW) motion1,2. The speed of the device is obviously linked to the DW velocity, and measured values up to 1 km s−1 have been reported in moderate fields3. Although such velocities were already reached in orthoferrite crystal films with a high anisotropy4, the surprise came from their observation in the low-anisotropy permalloy. We have studied, by numerical simulation, the DW propagation in such samples, and observed a very counter-intuitive behaviour. For perfect samples (no edge roughness), the calculated velocity increased with field up to a threshold, beyond which it abruptly decreased — a well-known phenomenon5. However, for rough strip edges, the velocity breakdown was found to be suppressed. We explain this phenomenon, and propose that roughness should rather be engineered than avoided when fabricating nanostructures for DW propagation.

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Figure 1: Simulated time-resolved domain wall (DW) motion in a permalloy wire.
Figure 2: Wall velocity versus field (same parameters as in Fig. 1).
Figure 3: Comparison of experimental values (the two data sets of Ref. 3) and numerical simulations (α = 0.02, D = 0 and 20 nm).

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References

  1. Allwood, D.A. et al. Submicrometer ferromagnetic NOT gate and shift register. Science 296, 2003–2006 ( 2002).

    Article  CAS  Google Scholar 

  2. Shiratori, T., Fujii, E., Miyaoka, Y. & Hozumi, Y. High-density magneto-optical recording with domain wall displacement detection. J. Magn. Soc. Jpn 22-S2, 47–50 ( 1998).

    Google Scholar 

  3. Atkinson, D. et al. Magnetic domain wall dynamics in a submicrometre ferromagnetic structure. Nature Mater. 2, 85–87 ( 2003).

    Article  CAS  Google Scholar 

  4. Malozemoff, A.P. & Slonczewski, J.C. Magnetic Domain Walls in Bubble Materials (Academic, New York, 1979).

    Google Scholar 

  5. Schryer, N.L. & Walker, L.R. The motion of 180° domain walls in uniform dc magnetic fields. J. Appl. Phys. 45, 5406–5421 ( 1974).

    Article  CAS  Google Scholar 

  6. Thiaville, A., Garcia, J.M. & Miltat, J. Domain wall dynamics in nanowires. J. Magn. Magn. Mater. 242–245, 1061–1063 ( 2002).

    Article  Google Scholar 

  7. Nakatani, Y., Hayashi, N., Ono, T. & Miyajima, H. Computer simulation of domain wall motion in a magnetic strip line with submicron width. IEEE Trans. Magn. 37, 2129–2131 ( 2001).

    Article  Google Scholar 

  8. McMichael, R.D. & Donahue, M.J. Head to head domain wall structures in thin magnetic strips. IEEE Trans. Magn. 33, 4167–4169 ( 1997).

    Article  Google Scholar 

  9. Hubert, A. & Schäfer, R. Magnetic domains (Springer, Berlin, 1998).

    Google Scholar 

  10. Thiele, A. Steady-state motion of magnetic domains. Phys. Rev. Lett. 30, 230–233 ( 1973).

    Article  Google Scholar 

  11. Feldtkeller, E. Mikromagnetisch stetige und unstetige Magnetisierungskonfigurationen. Z. Angew. Phys. 19, 530–536 ( 1965).

    Google Scholar 

  12. Thiele, A.A. & Asselin, P. Model for dynamic domain wall coercivity. J. Appl. Phys. 55, 2584–2586 ( 1984).

    Article  CAS  Google Scholar 

  13. Bouzidi, D. & Suhl, H. Motion of a Bloch domain wall. Phys. Rev. Lett. 65, 2587–2590 ( 1990).

    Article  CAS  Google Scholar 

  14. Schrefl, T., Fidler, J., Kirk, K.J. & Chapman, J.N. Simulation of magnetization reversal in polycrystalline patterned Co elements. J. Appl. Phys. 85, 6169–6171 ( 1999).

    Article  CAS  Google Scholar 

  15. Hadjipanayis, G.C. Nanophase hard magnets. J. Magn. Magn. Mater. 200, 373–391 ( 2000).

    Article  Google Scholar 

  16. Ono, T. et al. Propagation of a magnetic domain wall in a submicrometer magnetic wire. Science 284, 468–470 ( 1999).

    Article  CAS  Google Scholar 

  17. Gadbois, J. & Zhu, J.-G. Effect of edge roughness in nano-scale magnetic bar switching. IEEE Trans. Magn. 31, 3802–3804 ( 1995).

    Article  Google Scholar 

  18. Cowburn, R.P., Koltsov, D.K., Adeyeye, A.O. & Welland M.E. Lateral interface anisotropy in nanomagnets. J. Appl. Phys. 87, 7067–7069 ( 2000).

    Article  CAS  Google Scholar 

  19. Nakatani, Y., Uesaka, Y. & Hayashi, N. Direct solution of the Landau-Lifshitz-Gilbert equation for micromagnetics. Jpn J. Appl. Phys. 28, 2485–2507 ( 1989).

    Article  CAS  Google Scholar 

  20. Fukushima, H., Nakatani, Y. & Hayashi, N. Volume average demagnetizing tensor of rectangular prisms. IEEE Trans. Magn. 34, 193–198 ( 1998).

    Article  Google Scholar 

  21. Hayashi, N., Saito, K. & Nakatani, Y. Calculation of demagnetizing field distribution based on fast Fourier transform of convolution. Jpn J. Appl. Phys. 35, 6065–6073 ( 1996).

    Article  CAS  Google Scholar 

  22. Donahue, M.J. & Porter, D.G. OOMMF User's Guide, Version 1.0. Interagency Report NISTIR 6376 (National Institute of Standards and Technology, Gaithersburg, 1999).

    Book  Google Scholar 

  23. Press, W.H., Teukolsky, S.A., Vetterling, W.T. & Flannery, B.P. Numerical Recipes in FORTRAN (Cambridge Univ. Press, New York, 1992).

    Google Scholar 

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Acknowledgements

We thank D. Atkinson, G. Xiong and R. P. Cowburn for communicating their results before publication of Ref. 3. The stay of Y.N. at Orsay was supported by a grant from the Ministry of Education, Culture, Sports, Science and Technology of Japan.

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Authors and Affiliations

  1. CNRS-Université Paris-sud, Laboratoire de physique des solides, Orsay, 91405, France

    Yoshinobu Nakatani, André Thiaville & Jacques Miltat

  2. University of Electro-communications, 182-8585, Chofu, Tokyo, Japan

    Yoshinobu Nakatani

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  1. Yoshinobu Nakatani
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  2. André Thiaville
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Correspondence to André Thiaville.

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Nakatani, Y., Thiaville, A. & Miltat, J. Faster magnetic walls in rough wires. Nature Mater 2, 521–523 (2003). https://doi.org/10.1038/nmat931

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