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Title: Controlling the microstructure and associated magnetic properties of Ni 0.2Mn 3.2Ga 0.6 melt-spun ribbons by annealing

Here we report on the structural and magnetic properties of Ni 0.2Mn 3.2Ga 0.6 melt-spun ribbons. The as-spun ribbons were found to exhibit mixed cubic phases that transform to non-cubic structure upon annealing. Additionally, an amorphous phase was found to co-exist in all ribbons. The SEM images show that minor grain formation occurs on the as-spun ribbons. However, the formation of extensive nano-grains was observed on the surfaces of the annealed ribbons. While the as-spun ribbons exhibit predominantly paramagnetic behavior, the ribbons annealed under various thermal conditions were found to be ferromagnetic with a Curie temperature of about 380 K. The ribbons annealed at 450 °C for 30 minutes exhibit a large coercive field of about 2500 Oe. The experimental results show that the microstructure and associated magnetic properties of the ribbons can be controlled by annealing techniques. The coercive fields and the shape of the magnetic hysteresis loops vary significantly with annealing conditions. As a result, exchange bias effects have also been observed in the annealed ribbons.
 [1] ;  [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [3]
  1. Miami Univ., Oxford, OH (United States)
  2. Univ. of Nebraska, Lincoln, NE (United States)
  3. Louisiana State Univ., Baton Rouge, LA (United States)
Publication Date:
Grant/Contract Number:
FG02-04ER46152; FG02-13ER46946
Published Article
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 7; Journal Issue: 5; Journal ID: ISSN 2158-3226
American Institute of Physics (AIP)
Research Org:
Univ. of Nebraska, Lincoln, NE (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
36 MATERIALS SCIENCE; Nickel; Magnetic annealing; Magnetic materials; X-ray diffraction; Coercive force
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1393522; OSTI ID: 1421276