Magnetothermal properties of Ho1_xDyxAl2 (x=0, 0.05, 0.10, 0.15, 0.25 and 0.50) compounds

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2021-10-27
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Ribeiro, P.O.
Alho, B.P.
De Oliveira, R.S.
Nóbrega, E.P.
de Sousa, V.S.R.
von Ranke, P.J.
Biswas, Anis
Khan, Mahmud
Mudryk, Y.
Pecharsky, V.K.
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Iowa State University Digital Repository, Ames IA (United States)
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Ames National Laboratory

Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.

For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.

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Materials Science and Engineering

The Department of Materials Science and Engineering teaches the composition, microstructure, and processing of materials as well as their properties, uses, and performance. These fields of research utilize technologies in metals, ceramics, polymers, composites, and electronic materials.

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The Department of Materials Science and Engineering was formed in 1975 from the merger of the Department of Ceramics Engineering and the Department of Metallurgical Engineering.

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Abstract
Magnetic and magnetocaloric properties of Ho1_xDyxAl2 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.
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This is a manuscript of an article published as Ribeiro, P. O., B. P. Alho, R. S. De Oliveira, E. P. Nóbrega, V. S. R. de Sousa, P. J. von Ranke, Anis Biswas, Mahmud Khan, Y. Mudryk, and V. K. Pecharsky. "Magnetothermal properties of Ho1-xDyxAl2 (x= 0, 0.05, 0.10, 0.15, 0.25 and 0.50) compounds." Journal of Magnetism and Magnetic Materials 544 (2022): 168705. DOI: 10.1016/j.jmmm.2021.168705. Copyright 2021 Elsevier B.V. Posted with permission. DOE Contract Number(s): AC02-07CH11358
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