Abstract
Arrays of iron nanoparticles grown by a combination of chemical vapor deposition and scanning tunneling microscopy have been placed on top of a narrow stripe of Permalloy (Py). The magnetic coupling between the nanoparticles and the Py film results in distinct negative jumps of the Py magnetoresistance (MR). The switching of the magnetization orientation of individual particles is clearly reflected in the Py resistance as a consequence of anisotropic MR and domain wall MR, with a homogeneous particle magnetization orientation yielding the highest resistances.
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