High-coercivity magnetism in nanostructures with strong easy-plane anisotropy
Abstract
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 10 K 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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 11, 2016
- Source ID
- 10.1063/1.4945987
Entities
People
- Balamurugan Balasubramanian
- Bhaskar Das
- David J. Sellmyer
- George C. Hadjipanayis
- Pinaki Mukherjee
- Priyanka Manchanda
- Ralph Skomski
- Shah R. Valloppilly
Organizations
- Army Research Office
- National Science Foundation
- United States Department of Energy
- University of Delaware
- University of Nebraska–Lincoln