Magnetic properties of ultrathin Co/Pt multilayer Hall devices irradiated using focused ion beam

K Wang, Y Huang, Y.Z. Qiu, R.F. Chen, Peter Heard, Simon Bending

Research output: Contribution to journalArticle (Academic Journal)

3 Citations (Scopus)
256 Downloads (Pure)

Abstract

A ferromagnetic Co/Pt multilayer was lithographically patterned into 10-μm-wide Hall devices. The anisotropy of the fabricated devices was modified using focused ion beam (FIB). Extraordinary Hall effect (EHE) measurements reveal pronounced reduction in nucleation field of the perpendicular loops at room
temperature. At low temperature of 4.2 K reduced remanent ratios in EHE loops were observed, indicating a tilting of easy magnetic axis. The canting magnetization can be explained by an increasing magnetic moment at low temperatures and a reduced anisotropy by irradiation. The aperture angles
were estimated to be in the range of 20–32° at 4.2 K. The aperture angle of the easy cone of magnetization was found to increase with doses at low temperatures.
Original languageEnglish
Pages (from-to)158-160
Number of pages3
JournalPhysica B: Condensed Matter
Volume476
Early online date27 Mar 2015
DOIs
Publication statusPublished - 1 Nov 2015

Keywords

  • Co/Pt multilayers
  • Perpendicular magnetic anisotropy (PMA)
  • Extraordinary Hall effect (EHE)
  • Hall devices
  • Ion irradiation

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