Magnetic nanostructuring and overcoming Brown's paradox to realize extraordinary high-temperature energy products
Abstract
Nanoscience has been one of the outstanding driving forces in technology recently, arguably more so in magnetism than in any other branch of science and technology. Due to nanoscale bit size, a single computer hard disk is now able to store the text of 3,000,000 average-size books, and today’s high-performance permanent magnets—found in hybrid cars, wind turbines, and disk drives—are nanostructured to a large degree. The nanostructures ideally are designed from Co- and Fe-rich building blocks without critical rare-earth elements, and often are required to exhibit high coercivity and magnetization at elevated temperatures of typically up to 180 6C for many important permanent-magnet applications. Here we achieve this goal in exchange-coupled hard-soft composite films by effective nanostructuring of high-anisotropy HfCo7 nanoparticles with a high-magnetization Fe65Co35 phase. An analysis based on a model structure shows that the soft-phase addition improves the performance of the hard-magnetic material by mitigating Brown’s paradox in magnetism, a substantial reduction of coercivity from the anisotropy field. The nanostructures exhibit a high room-temperature energy product of about 20.3 MGOe (161.5 kJ/m3 ), which is a record for a rare earth- or Pt-free magnetic material and retain values as high as 17.1 MGOe (136.1 kJ/m3 ) at 1806C.
- Authors:
-
- Univ. of Nebraska, Lincoln, NE (United States). Nebraska Center for Materials and Nanoscience. Dept. of Physics and Astronomy
- Publication Date:
- Research Org.:
- Ames Laboratory (AMES), Ames, IA (United States); Univ. of Nebraska, Lincoln, NE (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1624739
- Grant/Contract Number:
- AC02-07CH11358; FG02-04ER46152
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scientific Reports
- Additional Journal Information:
- Journal Volume: 4; Journal Issue: 1; Journal ID: ISSN 2045-2322
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 77 NANOSCIENCE AND NANOTECHNOLOGY; Science & Technology - Other Topics; NANOSCIENCE AND TECHNOLOGY; MAGNETIC PROPERTIES AND MATERIALS
Citation Formats
Balasubramanian, Balamurugan, Mukherjee, Pinaki, Skomski, Ralph, Manchanda, Priyanka, Das, Bhaskar, and Sellmyer, David J. Magnetic nanostructuring and overcoming Brown's paradox to realize extraordinary high-temperature energy products. United States: N. p., 2014.
Web. doi:10.1038/srep06265.
Balasubramanian, Balamurugan, Mukherjee, Pinaki, Skomski, Ralph, Manchanda, Priyanka, Das, Bhaskar, & Sellmyer, David J. Magnetic nanostructuring and overcoming Brown's paradox to realize extraordinary high-temperature energy products. United States. https://doi.org/10.1038/srep06265
Balasubramanian, Balamurugan, Mukherjee, Pinaki, Skomski, Ralph, Manchanda, Priyanka, Das, Bhaskar, and Sellmyer, David J. Tue .
"Magnetic nanostructuring and overcoming Brown's paradox to realize extraordinary high-temperature energy products". United States. https://doi.org/10.1038/srep06265. https://www.osti.gov/servlets/purl/1624739.
@article{osti_1624739,
title = {Magnetic nanostructuring and overcoming Brown's paradox to realize extraordinary high-temperature energy products},
author = {Balasubramanian, Balamurugan and Mukherjee, Pinaki and Skomski, Ralph and Manchanda, Priyanka and Das, Bhaskar and Sellmyer, David J.},
abstractNote = {Nanoscience has been one of the outstanding driving forces in technology recently, arguably more so in magnetism than in any other branch of science and technology. Due to nanoscale bit size, a single computer hard disk is now able to store the text of 3,000,000 average-size books, and today’s high-performance permanent magnets—found in hybrid cars, wind turbines, and disk drives—are nanostructured to a large degree. The nanostructures ideally are designed from Co- and Fe-rich building blocks without critical rare-earth elements, and often are required to exhibit high coercivity and magnetization at elevated temperatures of typically up to 180 6C for many important permanent-magnet applications. Here we achieve this goal in exchange-coupled hard-soft composite films by effective nanostructuring of high-anisotropy HfCo7 nanoparticles with a high-magnetization Fe65Co35 phase. An analysis based on a model structure shows that the soft-phase addition improves the performance of the hard-magnetic material by mitigating Brown’s paradox in magnetism, a substantial reduction of coercivity from the anisotropy field. The nanostructures exhibit a high room-temperature energy product of about 20.3 MGOe (161.5 kJ/m3 ), which is a record for a rare earth- or Pt-free magnetic material and retain values as high as 17.1 MGOe (136.1 kJ/m3 ) at 1806C.},
doi = {10.1038/srep06265},
journal = {Scientific Reports},
number = 1,
volume = 4,
place = {United States},
year = {Tue Sep 02 00:00:00 EDT 2014},
month = {Tue Sep 02 00:00:00 EDT 2014}
}
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