Detection of a magnetic bead by hybrid nanodevices using scanning gate microscopy

Hector Corte-Leon, P Krzysteczko, F. Marchi, J. F. Motte, A. Manzin, Hans Werner Schumacher, Vladimir Antonov, O Kazakova

Research output: Contribution to journalArticlepeer-review


Hybrid ferromagnetic(Py)/non-magnetic metal(Au) junctions with a width of 400 nm are studied by magnetotransport measurements, magnetic scanning gate microscopy (SGM) with a magnetic bead (MB) attached to the probe, and micromagnetic simulations. In the transverse geometry, the devices demonstrate a characteristic magnetoresistive behavior that depends on the direction of the in plane magnetic field, with minimum/maximum variation when the field is applied parallel/perpendicular to the Py wire. The SGM is performed with a NdFeB bead of 1.6 μm diameter attached to the scanning probe. Our results demonstrate that the hybrid junction can be used to detect this type of MB. A rough approximation of the sensing volume of the junction has the shape of elliptical cylinder with the volume of ∼1.51 μm^3. Micro-magnetic simulations coupled to a magnetotransport model including anisotropic magneto-resistanceand planar Hall effects are in good agreement with the experimental findings,enabling the interpretation of the SGM images.
Original languageEnglish
Article number056502
Pages (from-to)1-9
Number of pages9
JournalAIP Advances
Issue number5
Early online date29 Feb 2016
Publication statusE-pub ahead of print - 29 Feb 2016


  • Magnetic bead
  • Nanodevices
  • Scanning Gate Microscopy

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