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Title: High-coercivity magnetism in nanostructures with strong easy-plane anisotropy

Here, we report the fabrication of a rare-earth-free permanent-magnet material Co 3Si in the form of nanoparticles and investigate its magnetic properties by experiments and density-functional theory (DFT). The DFT calculations show that bulk Co 3Si has an easy-plane anisotropy with a high K 1 ≈ -64 Merg/cm 3 (-6.4 MJ/m 3) and magnetic polarization of 9.2 kG (0.92 T). In spite of having a negative anisotropy that generally leads to negligibly low coercivities in bulk crystals, Co 3Si nanoparticles exhibit high coercivities (17.4 kOe at 10K and 4.3 kOe at 300 K). This result is a consequence of the unique nanostructure made possible by an effective easy-axis alignment in the cluster-deposition method and explained using micromagnetic analysis as a nanoscale phenomenon involving quantum-mechanical exchange interactions.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ; ORCiD logo [1] ;  [3] ;  [1]
  1. Univ. of Nebraska, Lincoln, NE (United States). Nebraska Center for Materials and Nanoscience and Dept. of Physics and Astronomy
  2. Univ. of Nebraska, Lincoln, NE (United States). Nebraska Center for Materials and Nanoscience
  3. Univ. of Delaware, Newark, DE (United States). Dept. of Physics and Astronomy
Publication Date:
Grant/Contract Number:
FG02-04ER46152; FG02-04ER4612; WF911NF-10-2-0099; NNCI: 1542182
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 108; Journal Issue: 15; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Univ. of Nebraska, Lincoln, NE (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); US Army Research Office (ARO); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE
OSTI Identifier:
1470753
Alternate Identifier(s):
OSTI ID: 1247890