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

Balasubramanian, Balamurugan; Manchanda, Priyanka; Skomski, Ralph; Mukherjee, Pinaki; Valloppilly, Shah R.; Das, Bhaskar; Hadjipanayis, George C.; Sellmyer, David J.

doi:10.1063/1.4945987

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

Journal Article · Fri Apr 15 00:00:00 EDT 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4945987· OSTI ID:1470753

Balasubramanian, Balamurugan ^[1]; Manchanda, Priyanka ^[1]; Skomski, Ralph ^[1]; Mukherjee, Pinaki ^[1]; Valloppilly, Shah R. ^[2];

^[1]; Hadjipanayis, George C. ^[3]; Sellmyer, David J. ^[1]

Univ. of Nebraska, Lincoln, NE (United States). Nebraska Center for Materials and Nanoscience and Dept. of Physics and Astronomy
Univ. of Nebraska, Lincoln, NE (United States). Nebraska Center for Materials and Nanoscience
Univ. of Delaware, Newark, DE (United States). Dept. of Physics and Astronomy

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.

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Research Organization:: Univ. of Nebraska, Lincoln, NE (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); US Army Research Office (ARO); National Science Foundation (NSF)

Grant/Contract Number:: FG02-04ER46152; FG02-04ER4612; WF911NF-10-2-0099; NNCI: 1542182

OSTI ID:: 1470753

Alternate ID(s):: OSTI ID: 1247890

Journal Information:: Applied Physics Letters, Vol. 108, Issue 15; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 22 works

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Magnetism of new metastable cobalt-nitride compounds Balasubramanian, Balamurugan; Zhao, Xin; Valloppilly, Shah R. Nanoscale, Vol. 10, Issue 27 https://doi.org/10.1039/c8nr02105h	journal	January 2018
Magnetocrystalline anisotropy of Co ₃ Si (001) films from first principles Pathak, Rohit; Balasubramanian, Balamurugan; Sellmyer, D. J. AIP Advances, Vol. 9, Issue 3 https://doi.org/10.1063/1.5079851	journal	March 2019
Structures, phase transitions, and magnetic properties of $C o_{3} Si$ from first-principles calculations Zhao, Xin; Yu, Shu; Wu, Shunqing Physical Review B, Vol. 96, Issue 2 https://doi.org/10.1103/physrevb.96.024422	journal	July 2017
Structure and Magnetism of Co2Ge Nanoparticles Tosun, Onur; Abel, Frank M.; Balasubramanian, Balamurugan Nanomaterials, Vol. 9, Issue 10 https://doi.org/10.3390/nano9101371	journal	September 2019

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