Intrinsic magnetic properties of L1{sub 0} FeNi obtained from meteorite NWA 6259
Abstract
FeNi having the tetragonal L1{sub 0} crystal structure is a promising new rare-earth-free permanent magnet material. Laboratory synthesis is challenging, however, tetragonal L1{sub 0} FeNi—the mineral “tetrataenite”—has been characterized using specimens found in nickel-iron meteorites. Most notably, the meteorite NWA 6259 recovered from Northwest Africa is 95 vol. % tetrataenite with a composition of 43 at. % Ni. Hysteresis loops were measured as a function of sample orientation on a specimen cut from NWA 6259 in order to rigorously deduce the intrinsic hard magnetic properties of its L1{sub 0} phase. Electron backscatter diffraction showed that NWA 6259 is strongly textured, containing L1{sub 0} grains oriented along any one of the three equivalent cubic directions of the parent fcc structure. The magnetic structure was modeled as a superposition of the three orthonormal uniaxial variants. By simultaneously fitting first-quadrant magnetization data for 13 different orientations of the sample with respect to the applied field direction, the intrinsic magnetic properties were estimated to be saturation magnetization 4πM{sub s} = 14.7 kG and anisotropy field H{sub a} = 14.4 kOe. The anisotropy constant K = 0.84 MJ/m{sup 3} is somewhat smaller than the value K = 1.3 MJ/m{sup 3} obtained by earlier researchers from nominally equiatomic FeNi prepared by neutron irradiation accompanied by annealing in a magnetic field,more »
- Authors:
-
- MEDA Engineering and Technical Services, Southfield, Michigan 48075 (United States)
- Chemical Sciences and Materials Systems Lab, GM R and D Center, Warren, Michigan 48090 (United States)
- Department of Chemical Engineering, Northeastern University, Boston, Massachusetts 02115 (United States)
- Department of Mechanical and Industrial Engineering, University of Massachusetts, Amherst, Massachusetts 01003 (United States)
- Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588 (United States)
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027 (United States)
- Publication Date:
- OSTI Identifier:
- 22410152
- Resource Type:
- Journal Article
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANISOTROPY; ANNEALING; BACKSCATTERING; ELECTRON DIFFRACTION; FCC LATTICES; HYSTERESIS; IRON METEORITES; IRRADIATION; MAGNETIC FIELDS; MAGNETIC PROPERTIES; MAGNETIZATION; MINERALS; NEUTRON FLUENCE; NICKEL; PERMANENT MAGNETS; PHYSICAL RADIATION EFFECTS; RARE EARTHS; TEXTURE
Citation Formats
Poirier, Eric, Pinkerton, Frederick E., E-mail: frederick.e.pinkerton@gm.com, Kubic, Robert, Mishra, Raja K., Bordeaux, Nina, Lewis, Laura H., Mubarok, Arif, Goldstein, Joseph I., Skomski, Ralph, and Barmak, Katayun. Intrinsic magnetic properties of L1{sub 0} FeNi obtained from meteorite NWA 6259. United States: N. p., 2015.
Web. doi:10.1063/1.4916190.
Poirier, Eric, Pinkerton, Frederick E., E-mail: frederick.e.pinkerton@gm.com, Kubic, Robert, Mishra, Raja K., Bordeaux, Nina, Lewis, Laura H., Mubarok, Arif, Goldstein, Joseph I., Skomski, Ralph, & Barmak, Katayun. Intrinsic magnetic properties of L1{sub 0} FeNi obtained from meteorite NWA 6259. United States. https://doi.org/10.1063/1.4916190
Poirier, Eric, Pinkerton, Frederick E., E-mail: frederick.e.pinkerton@gm.com, Kubic, Robert, Mishra, Raja K., Bordeaux, Nina, Lewis, Laura H., Mubarok, Arif, Goldstein, Joseph I., Skomski, Ralph, and Barmak, Katayun. 2015.
"Intrinsic magnetic properties of L1{sub 0} FeNi obtained from meteorite NWA 6259". United States. https://doi.org/10.1063/1.4916190.
@article{osti_22410152,
title = {Intrinsic magnetic properties of L1{sub 0} FeNi obtained from meteorite NWA 6259},
author = {Poirier, Eric and Pinkerton, Frederick E., E-mail: frederick.e.pinkerton@gm.com and Kubic, Robert and Mishra, Raja K. and Bordeaux, Nina and Lewis, Laura H. and Mubarok, Arif and Goldstein, Joseph I. and Skomski, Ralph and Barmak, Katayun},
abstractNote = {FeNi having the tetragonal L1{sub 0} crystal structure is a promising new rare-earth-free permanent magnet material. Laboratory synthesis is challenging, however, tetragonal L1{sub 0} FeNi—the mineral “tetrataenite”—has been characterized using specimens found in nickel-iron meteorites. Most notably, the meteorite NWA 6259 recovered from Northwest Africa is 95 vol. % tetrataenite with a composition of 43 at. % Ni. Hysteresis loops were measured as a function of sample orientation on a specimen cut from NWA 6259 in order to rigorously deduce the intrinsic hard magnetic properties of its L1{sub 0} phase. Electron backscatter diffraction showed that NWA 6259 is strongly textured, containing L1{sub 0} grains oriented along any one of the three equivalent cubic directions of the parent fcc structure. The magnetic structure was modeled as a superposition of the three orthonormal uniaxial variants. By simultaneously fitting first-quadrant magnetization data for 13 different orientations of the sample with respect to the applied field direction, the intrinsic magnetic properties were estimated to be saturation magnetization 4πM{sub s} = 14.7 kG and anisotropy field H{sub a} = 14.4 kOe. The anisotropy constant K = 0.84 MJ/m{sup 3} is somewhat smaller than the value K = 1.3 MJ/m{sup 3} obtained by earlier researchers from nominally equiatomic FeNi prepared by neutron irradiation accompanied by annealing in a magnetic field, suggesting that higher Ni content (fewer Fe antisite defects) may improve the anisotropy. The fit also indicated that NWA 6259 contains one dominant variant (62% by volume), the remainder of the sample being a second variant, and the third variant being absent altogether.},
doi = {10.1063/1.4916190},
url = {https://www.osti.gov/biblio/22410152},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 17,
volume = 117,
place = {United States},
year = {Thu May 07 00:00:00 EDT 2015},
month = {Thu May 07 00:00:00 EDT 2015}
}