The role of one-dimensional magnetic nanoprecipitates on the magnetoresistance of soft magnetic alloys: Study of a melt-spun Cu–Co alloy

Natasha M. Suguihiro, Wilmar S. Torres, Wallace C. Nunes, Elisa B. Saitovitch, Martha R. Mc Cartney, David J. Smith, Antonio M.L.M. Costa, I. Guillermo Solórzano

Research output: Contribution to journalArticlepeer-review

Abstract

This work has investigated the microstructure and magnetic properties of supersaturated melt-spun Cu–10%Co alloys by means of magnetization, magnetotransport studies, electron microscopy and electron holography. Our results demonstrate that the microstructure of the annealed supersaturated alloys is constituted by two different types of Co-rich phases: spherical Co-rich precipitates as a result of spinodal decomposition, and Co rod-like precipitates, as a result of discontinuous grain-boundary precipitation. The aspect ratio of such precipitates is quite high, exhibiting magnetic anisotropy along their long axes, which generates global anisotropy of the alloy sample. We verified that the highest giant magnetoresistance occurs concurrently with an optimum discontinuous precipitate development. Electron holography reveals an antiferromagnetic coupling of the Co rods in the remanent magnetization state. The magnetization and magnetoresistance curves as a function of applied magnetic field are well described by an independent-moment approach considering the sum of the average magnetic moments of the spherical and the rod-like Co precipitates.

Original languageEnglish (US)
Article number124517
JournalMaterials Chemistry and Physics
Volume266
DOIs
StatePublished - Jul 1 2021

Keywords

  • Discontinuous nanorod precipitation
  • Granular systems
  • Magnetic one-dimensional nanoparticles
  • Magnetoresistance
  • Supersaturated Cu–Co alloys

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'The role of one-dimensional magnetic nanoprecipitates on the magnetoresistance of soft magnetic alloys: Study of a melt-spun Cu–Co alloy'. Together they form a unique fingerprint.

Cite this