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Magnetization Reversal in Elongated Fe Nanoparticles

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arxiv cond-mat/0505356 v1 pith:O6PFYNRT submitted 2005-05-13 cond-mat.mtrl-sci

Yongqing Li , Peng Xiong , Stephan von Molnar , Yuzo Ohno , Hideo Ohno This is my paper · ORCID
classification cond-mat.mtrl-sci
keywords reversalmagnetizationdiameterelongatedmagneticnanoparticlenanoparticlesparticle
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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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