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

H. Corte-León, P. Krzysteczko, F. Marchi, J. F. Motte, A. Manzin, H. W. Schumacher, V. Antonov, O. Kazakova

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


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 μm3. Micromagnetic simulations coupled to a magnetotransport model including anisotropic magnetoresistance and planar Hall effects are in good agreement with the experimental findings, enabling the interpretation of the SGM images.

Original languageEnglish
Article number056502
JournalAIP Advances
Issue number5
Publication statusPublished - 1 May 2016
Externally publishedYes


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