Magnetic scanning gate microscopy of CoFeB lateral spin valve

Hector Corte-Leon, Alexander Fernandez Scarioni, Rhodri Mansell, Patryk Krzysteczko, David Cox, Damien McGrouther, Stephen McVitie, Russell Cowburn, Hans W. Schumacher, Vladimir Antonov, Olga Kazakova

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Devices comprised of CoFeB nanostructures with perpendicular magnetic anisotropy and non-magnetic Ta channel were operated in thermal lateral spin valve (LSV) mode and studied by magnetotransport measurements and magnetic scanning gate microscopy (SGM). Due to the short spin diffusion length of Ta, the spin diffusion signal was suppressed, allowing the study of the contribution from the anomalous Nernst (ANE) and anomalous Hall effects (AHE). The magnetotransport measure- ments identified the switching fields of the CoFeB nanostructures and demonstrated a combination of AHE and ANE when the devices were operated in thermally-driven spin-injection mode. Modified scanning probe microscopy probes were fabricated by placing a NdFeB magnetic bead (MB) on the apex of a commercial Si probe. The dipole magnetic field distribution around the MB was characterized by using differen- tial phase contrast technique and direct measurement of the switching field induced by the bead in the CoFeB nanodevices. Using SGM we demonstrate the influence of local- ized magnetic field on the CoFeB nanostructures near the non-magnetic channel. This approach provides a promising route towards the study of thermal and spin diffusion effects using local magnetic fields.
Original languageEnglish
Article number056808
Pages (from-to)1-7
Number of pages7
JournalAIP Advances
Issue number5
Early online date1 Mar 2017
Publication statusPublished - 2017


  • AFM
  • nanomagnetics
  • microscopy

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