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Title: Magnetothermal properties of Ho1-xDyxAl2 (x = 0, 0.05, 0.10, 0.15, 0.25 and 0.50) compounds

Journal Article · · Journal of Magnetism and Magnetic Materials
 [1];  [2];  [3];  [3];  [3];  [3];  [4];  [5];  [4];  [4]
  1. Universidade do Estado do Rio de Janeiro (Brazil); Ames Lab., Ames, IA (United States)
  2. Iowa State Univ., Ames, IA (United States); Universidade do Estado do Rio de Janeiro (Brazil)
  3. Universidade do Estado do Rio de Janeiro (Brazil)
  4. Ames Lab., and Iowa State Univ., Ames, IA (United States)
  5. Miami Univ., Oxford, OH (United States)

Magnetic and magnetocaloric properties of H o 1 - x D y x A l 2 compounds with x = 0 , 0.05 , 0.10 , 0.15 , 0.25 and 0.50 , modelled using a Hamiltonian that includes the exchange interactions between Ho-Dy, Ho-Ho and Dy-Dy ions in addition to the crystalline electric field and the Zeeman effects, have been compared with those determined experimentally. In order to reproduce experimentally observed global ferromagnetic ordering temperatures and spin reorientation transition temperatures as xDy varies, the exchange interactions between Ho-Dy and Ho-Ho were set as free parameters and adjusted to match the experimental results. We demonstrate that heat capacity of polycrystalline materials in non-zero magnetic fields can be satisfactory reproduced by using the average of multiple magnetic field directions with respect to the crystallographic coordinate system, while reasonably good agreement between experimentally determined and theoretically predicted magnetocaloric effects can be achieved considering an average of only three field directions.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1833545
Report Number(s):
IS-J--10,648; DE-AC02-07CH11358
Journal Information:
Journal of Magnetism and Magnetic Materials, Journal Name: Journal of Magnetism and Magnetic Materials Vol. 544; ISSN 0304-8853
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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