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Title: Anti-site mixing and magnetic properties of Fe3Co3Nb2 studied via neutron powder diffraction

Journal Article · · Journal of Physics. D, Applied Physics
 [1];  [2];  [3];  [1];  [1];  [4];  [5];  [1]
  1. Univ. of Nebraska, Lincoln, NE (United States). Dept. of Physics and Astronomy and Nebraska Center for Materials and Nanoscience
  2. Univ. of Nebraska, Lincoln, NE (United States); Xi'an Jiaotong Univ., ShaanXi (People's Republic of China)
  3. Univ. of Nebraska, Lincoln, NE (United States). Dept. of Physics and Astronomy
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Engineering Materials Division
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Here, we studied the crystal structure and magnetic properties of the rare-earth-free intermetallic compound Fe3Co3Nb2, which has recently been demonstrated to have potentially high magnetic anisotropy, using temperature-dependent neutron powder diffraction. Furthermore, the temperature dependence of the diffraction spectra reveals a magnetic transition between 300 and 400 K, in agreement with the magnetometry measurements. According to the structural refinement of the paramagnetic state and the substantial magnetic contribution to the diffuse scattering in the ferromagnetic state, the Fe/Co anti-site mixing is so strong that the site occupation for Fe and Co is almost random. The projection of the magnetic moments turned out to be non-zero along the c axis and in the a–b plane of Fe3Co3Nb2, most likely because of the exchange interactions between the randomly orientated nanograins in the samples. These findings suggest that future studies on the magnetism of Fe3Co3Nb2 need to take the Fe/Co anti-site mixing into account, and the exchange interactions need to be suppressed to obtain large remanence and coercivity.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1334494
Journal Information:
Journal of Physics. D, Applied Physics, Vol. 50, Issue 2; ISSN 0022-3727
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

References (16)

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Exploring the Structural Complexity of Intermetallic Compounds by an Adaptive Genetic Algorithm journal January 2014
Neutron scattering lengths and cross sections journal January 1992
Hf–Co and Zr–Co alloys for rare-earth-free permanent magnets journal January 2014
A profile refinement method for nuclear and magnetic structures journal June 1969
Recent advances in magnetic structure determination by neutron powder diffraction journal October 1993
Debye–Waller Factors and Absorptive Scattering Factors of Elemental Crystals journal May 1996
Augular Distributions of the Alpha Particles from the ( p , α) Reactions on Na 23 and K 39 at 6.9∼7.3 MeV journal January 1962
Neutron Diffraction Studies of the Magnetic Structure of Alloys of Transition Elements journal January 1955
Symmetry and magnetic structures journal January 2012
Neutron Diffraction of Magnetic Materials journal January 2006
Morphology and domain pattern of L10 ordered FePt films journal November 2003
Microstructure and magnetic properties of FePt and Fe/FePt polycrystalline films with high coercivity journal July 2004

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
magnetic coercivity
neutron diffraction
intermetallic compound