Magnetization Reversal in Elongated Fe Nanoparticles

Abstract

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.

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

References in corpus (3)

• Langevin Simulation of Thermally Activated Magnetization Reversal in Nanoscale Pillars
• Modulation of Noise in Submicron GaAs/AlGaAs Hall Devices by Gating
• Angular Dependence of Switching Properties in Single Fe Nanopillars

Cited by in corpus (5)

• Magnetic Fingerprints of sub-100 nm Fe Nanodots
• Magnetization reversal of dipolar coupled nanomagnets studied by two-dimensional electron gas based micro-Hall magnetometry
• Resolution-dependent mechanisms for bimodal switching-time distributions in simulated Fe nanopillars
• Domain wall dynamics in a single CrO${}_2$ grain
• Two Modes of Magnetization Switching in a Simulated Iron Nanopillar in an Obliquely Oriented Field