Alignment of Iron Nanoparticles in a Magnetic Field Due to Shape Anisotropy

Journal Article · Thu Jul 09 00:00:00 EDT 2015 · Journal of Magnetism and Magnetic Materials

DOI:https://doi.org/10.1016/j.jmmm.2015.07.007· OSTI ID:1207049

Radhakrishnan, Balasubramaniam ^[1]; Nicholson, Don M ^[1]; Eisenbach, Markus ^[1]; Ludtka, Gerard Michael ^[1]; Rios, Orlando ^[1]; Parish, Chad M ^[1]

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1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

During high magnetic field processing there is evidence for alignment of non-spherical metallic particles above the Curie temperature in alloys with negligible magneto-crystalline anisotropy. The main driving force for alignment is the magnetic shape anisotropy. Current understanding of the phenomenon is not adequate to quantify the effect of particle size, aspect ratio, temperature and the magnetic field on particle alignment. We demonstrate a Monte Carlo approach coupled with size scaling to show the conditions under which alignment is possible.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: AC05-00OR22725; De-AC05-00OR22725
• OSTI ID: 1207049
• Alternate ID(s): OSTI ID: 1247838
• Journal Information: Journal of Magnetism and Magnetic Materials, Vol. 394; ISSN 0304-8853
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
36 MATERIALS SCIENCE