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Terabit Density Cobalt Nanowire Arrays With Tunable Magnetic Properties

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Abstract

Nanoporous templates made from diblock copolymer films are used for electrochemical fabrication of hexagonal arrays of vertical cobalt magnetic nanowires at terabit/in2 density. The nanowire diameter and areal density are determined by the copolymer molecular weight, whereas the nanowire length and internal crystal morphology are controlled through the dc electrodeposition growth process. The array magnetic properties can be modified substantially by electrodeposition pH conditions while keeping wire size and interwire distance constant. Optimum pH control results in preferential growth of c-axis oriented crystallites with large perpendicular coercivity. The appearance of exchange bias behavior, exhibited at low temperatures, is also investigated.

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Authors and Affiliations

  1. Department of Physics, University of Massachusetts, Amherst, MA, USA

    Andrei Ursache, Mustafa Bal & Mark T. Tuominen

  2. Polymer Science and Engineering Department, University of Massachusetts, Amherst, MA, USA

    James T. Goldbach & Thomas P. Russell

  3. IBM T. J. Watson Research Center, Yorktown Heights, NY, USA

    Robert L. Sandstrom & C. T. Black

Authors
  1. Andrei Ursache
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  2. Mustafa Bal
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  3. James T. Goldbach
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  4. Robert L. Sandstrom
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  5. C. T. Black
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  6. Thomas P. Russell
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  7. Mark T. Tuominen
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Ursache, A., Bal, M., Goldbach, J.T. et al. Terabit Density Cobalt Nanowire Arrays With Tunable Magnetic Properties. MRS Online Proceedings Library 721, 33 (2002). https://doi.org/10.1557/PROC-721-E3.3

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  • DOI: https://doi.org/10.1557/PROC-721-E3.3

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