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Title: Orbital and spin moments of 5 to 11 nm Fe{sub 3}O{sub 4} nanoparticles measured via x-ray magnetic circular dichroism

The orbital and spin contributions to the magnetic moment of Fe in Fe{sub 3}O{sub 4} nanoparticles were measured using X-ray magnetic circular dichroism (XMCD). Nanoparticles of different sizes, ranging from 5 to 11 nm, were fabricated via organic methods and their magnetic behavior was characterized by vibrating sample magnetometry (VSM). An XMCD signal was measured for three different samples at 300 K and 80 K. The extracted values for the orbital and spin contributions to the magnetic moment showed a quenching of the orbital moment and a large spin moment. The calculated spin moments appear somewhat reduced compared to the value expected for bulk Fe{sub 3}O{sub 4}. The spin moments measured at 80 K are larger than at 300 K for all the samples, revealing significant thermal fluctuations effects in the nanoparticle assemblies. The measured spin moment is reduced for the smallest nanoparticles, suggesting that the magnetic properties of Fe{sub 3}O{sub 4} nanoparticles could be altered when their size reaches a few nanometers.
Authors:
; ; ; ;  [1] ; ;  [2] ; ; ; ; ; ; ;  [3]
  1. Department of Physics and Astronomy, Brigham Young University, Provo, Utah 84602 (United States)
  2. Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602 (United States)
  3. SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Science (SIMES), Menlo Park, California 94025 (United States)
Publication Date:
OSTI Identifier:
22273502
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; COMPARATIVE EVALUATIONS; FLUCTUATIONS; IRON OXIDES; MAGNETIC CIRCULAR DICHROISM; MAGNETIC MOMENTS; MAGNETIC PROPERTIES; NANOSTRUCTURES; PARTICLES; QUENCHING; SPIN; TEMPERATURE DEPENDENCE; VIBRATING SAMPLE MAGNETOMETERS; X RADIATION