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

Abstract

Here, we report the fabrication of a rare-earth-free permanent-magnet material Co3Si in the form of nanoparticles and investigate its magnetic properties by experiments and density-functional theory (DFT). The DFT calculations show that bulk Co3Si has an easy-plane anisotropy with a high K1 ≈ -64 Merg/cm3 (-6.4 MJ/m3) 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, Co3Si 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:
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)
OSTI Identifier:
1470753
Alternate Identifier(s):
OSTI ID: 1247890
Grant/Contract Number:  
FG02-04ER46152; FG02-04ER4612; WF911NF-10-2-0099; NNCI: 1542182
Resource 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)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE

Citation Formats

Balasubramanian, Balamurugan, Manchanda, Priyanka, Skomski, Ralph, Mukherjee, Pinaki, Valloppilly, Shah R., Das, Bhaskar, Hadjipanayis, George C., and Sellmyer, David J. High-coercivity magnetism in nanostructures with strong easy-plane anisotropy. United States: N. p., 2016. Web. doi:10.1063/1.4945987.
Balasubramanian, Balamurugan, Manchanda, Priyanka, Skomski, Ralph, Mukherjee, Pinaki, Valloppilly, Shah R., Das, Bhaskar, Hadjipanayis, George C., & Sellmyer, David J. High-coercivity magnetism in nanostructures with strong easy-plane anisotropy. United States. doi:10.1063/1.4945987.
Balasubramanian, Balamurugan, Manchanda, Priyanka, Skomski, Ralph, Mukherjee, Pinaki, Valloppilly, Shah R., Das, Bhaskar, Hadjipanayis, George C., and Sellmyer, David J. Fri . "High-coercivity magnetism in nanostructures with strong easy-plane anisotropy". United States. doi:10.1063/1.4945987. https://www.osti.gov/servlets/purl/1470753.
@article{osti_1470753,
title = {High-coercivity magnetism in nanostructures with strong easy-plane anisotropy},
author = {Balasubramanian, Balamurugan and Manchanda, Priyanka and Skomski, Ralph and Mukherjee, Pinaki and Valloppilly, Shah R. and Das, Bhaskar and Hadjipanayis, George C. and Sellmyer, David J.},
abstractNote = {Here, we report the fabrication of a rare-earth-free permanent-magnet material Co3Si in the form of nanoparticles and investigate its magnetic properties by experiments and density-functional theory (DFT). The DFT calculations show that bulk Co3Si has an easy-plane anisotropy with a high K1 ≈ -64 Merg/cm3 (-6.4 MJ/m3) 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, Co3Si 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.},
doi = {10.1063/1.4945987},
journal = {Applied Physics Letters},
number = 15,
volume = 108,
place = {United States},
year = {2016},
month = {4}
}

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