Magnetization Reversal in Elongated Fe Nanoparticles

Details Magnetization Reversal in Elongated Fe Nanoparticles Magnetization Reversal in Elongated Fe Nanoparticles

2005-05-13

arxiv.org/abs/cond-mat/0505356v1

Physics

Condensed Matter

Materials Science

6 pages, 6 figures, to appear in Phys. Rev. B (2005)

Scientific paper

10.1103/PhysRevB.71.214425

Magnetization reversal of individual, isolated high-aspect-ratio Fe nanoparticles with diameters comparable to the magnetic exchange length is studied by high-sensitivity submicron Hall magnetometry. For a Fe nanoparticle with diameter of 5 nm, the magnetization reversal is found to be an incoherent process with localized nucleation assisted by thermal activation, even though the particle has a single-domain static state. For a larger elongated Fe nanoparticle with a diameter greater than 10 nm, the inhomogeneous magnetic structure of the particle plays important role in the reversal process.

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