DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Controlling the microstructure and associated magnetic properties of Ni0.2Mn3.2Ga0.6 melt-spun ribbons by annealing

Journal Article · · AIP Advances
DOI: https://doi.org/10.1063/1.4977892 · OSTI ID:1349374
 [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)

Here we report on the structural and magnetic properties of Ni0.2Mn3.2Ga0.6 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.

Research Organization:
Univ. of Nebraska, Lincoln, NE (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-04ER46152; FG02-13ER46946
OSTI ID:
1349374
Alternate ID(s):
OSTI ID: 1393522; OSTI ID: 1421276
Journal Information:
AIP Advances, Vol. 7, Issue 5; ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (14)

Magnetism and electron transport of Mn y Ga (1 < y < 2) nanostructures journal July 2013
Multifunctional L10-Mn1.5Ga Films with Ultrahigh Coercivity, Giant Perpendicular Magnetocrystalline Anisotropy and Large Magnetic Energy Product journal July 2012
Cerium: An Unlikely Replacement of Dysprosium in High Performance Nd-Fe-B Permanent Magnets journal March 2015
Intrinsic magnetic properties of single-phase Mn1+xGa (0 < x < 1) alloys journal November 2015
Nanostructured D0 22 -Mn 3 Ga with high coercivity journal February 2015
Current status and recent topics of rare-earth permanent magnets journal January 2011
Large coercivity in nanostructured rare-earth-free Mn x Ga films journal December 2011
Magnetization and coercivity of Mn3−δGa alloys with a D022-type structure journal January 1996
Pr‐Fe and Nd‐Fe‐based materials: A new class of high‐performance permanent magnets (invited) journal March 1984
High coercivity in Mn-Ga-Cu alloys journal July 2016
Phase evaluation, magnetic, and electric properties of Mn 60+x Ga 40−x (x = 0–15) ribbons journal May 2014
Magnetic properties and large coercivity of MnxGa nanostructures journal May 2014
Coercivity after heat treatment of overquenched and optimally quenched Nd‐Fe‐B journal August 1987
Hard magnetic properties of Mn-Ga melt-spun ribbons journal October 2012