Tunable High-Field Magnetization in Strongly Exchange-Coupled Freestanding Co/CoO Core/Shell Coaxial Nanowires

German Salazar-Alvarez, Julian Geshev, Sebastià Agramunt-Puig, Carles Navau, Alvaro Sanchez, Jordi Sort, Josep Nogués

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19 Citations (Scopus)

Abstract

© 2016 American Chemical Society. The exchange bias properties of Co/CoO coaxial core/shell nanowires were investigated with cooling and applied fields perpendicular to the wire axis. This configuration leads to unexpected exchange-bias effects. First, the magnetization value at high fields is found to depend on the field-cooling conditions. This effect arises from the competition between the magnetic anisotropy and the Zeeman energies for cooling fields perpendicular to the wire axis. This allows imprinting predefined magnetization states to the antiferromagnetic (AFM) shell, as corroborated by micromagnetic simulations. Second, the system exhibits a high-field magnetic irreversibility, leading to open hysteresis loops attributed to the AFM easy axis reorientation during the reversal (effect similar to athermal training). A distinct way to manipulate the high-field magnetization in exchange-biased systems, beyond the archetypical effects, was thus experimentally and theoretically demonstrated.
Original languageEnglish
Pages (from-to)22477-22483
JournalACS Applied Materials and Interfaces
Volume8
Issue number34
DOIs
Publication statusPublished - 31 Aug 2016

Keywords

  • coaxial nanowires
  • CoO
  • exchange bias
  • high-field irreversibility
  • training effects
  • uncompensated spins

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    Salazar-Alvarez, G., Geshev, J., Agramunt-Puig, S., Navau, C., Sanchez, A., Sort, J., & Nogués, J. (2016). Tunable High-Field Magnetization in Strongly Exchange-Coupled Freestanding Co/CoO Core/Shell Coaxial Nanowires. ACS Applied Materials and Interfaces, 8(34), 22477-22483. https://doi.org/10.1021/acsami.6b05588