Controlled domain wall pinning in ferromagnetic nanowire by nanoparticles stray fields

摘要

We report the results of experimental investigations of controlled domainwall (DW) pinning in a ferromagnetic nanowire (NW) by stray fields of twouniformly magnetized bistable ferromagnetic nanoparticles (NPs) placed oneither side of the NW and elongated parallel to the NW axis. We show bymagnetic force microscopy measurements that DW pinning strength essentiallydepends on the orientation of the NP magnetic moments relative to the NWmagnetization and can reach 20 mT. We also performed micromagnetic simulationsconfirming the influence of the magnetostatic interaction of the DW with the NPstray fields on the pinning strength. The possible realization of logic cellwith switchable logic function is discussed.