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Effects of size and interactions on the magnetic behaviour of elliptical (001)Fe nanoparticles
Chalmers, Dept Appl Phys, SE-41296 Gothenburg, Sweden.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
2007 (English)In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766Article in journal (Refereed) Published
Abstract [en]

ABSTRACT: Arrays of elliptical particles with aspect ratio 1:3 and short axes 50, 100 and 150 nm were prepared by electron-beam lithography and ion-beam milling of epitaxial (0 0 1)Fe films of thicknesses 10 and 20 nm. The domain state of an individual particle imaged by magnetic force microscopy in zero field after demagnetization was observed to change from being bi-domain or multidomain (MD) to stable single domains (SD) as the lateral size and film thickness were decreased. The critical size for SD formation was found to be close to the actual lateral sizes of 100 nm×300 nm and 150 nm×450 nm for the thicknesses of 20 and 10 nm, respectively. Only in the 10 nm thick ellipses of lateral size 100 nm×300 nm, the magnetization reversal may take place through coherent rotation. For all other investigated samples, the experimental switching field is lower than what would be required for this process.

Article · Sep 2007 · Journal of Magnetism and Magnetic Materials

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Physical Sciences Engineering and Technology
URN: urn:nbn:se:uu:diva-284106OAI: oai:DiVA.org:uu-284106DiVA: diva2:919819
Available from: 2016-04-15 Created: 2016-04-15 Last updated: 2016-04-26

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