Crystalline structure and magnetic behavior of the Ni41Mn39In12Co8 alloy demonstrating giant magnetocaloric effect

Madiligama, A. S. B.; Ari-Gur, P.; Shavrov, V. G.; Koledov, V. V.; Calder, S.; Mashirov, A. V.; Kamantsev, A. P.; Dilmieva, E. T.; Gonzalez-Legarreta, L.; Grande, B. H.; Vega, V. V.; Kayani, A.

doi:10.1088/0964-1726/25/8/085013

Crystalline structure and magnetic behavior of the Ni₄₁Mn₃₉In₁₂Co₈ alloy demonstrating giant magnetocaloric effect

Journal Article · Tue Jul 19 00:00:00 EDT 2016 · Smart Materials and Structures

DOI:https://doi.org/10.1088/0964-1726/25/8/085013· OSTI ID:1485318

Madiligama, A. S. B. ^[1]; Ari-Gur, P. ^[1]; Shavrov, V. G. ^[2]; Koledov, V. V. ^[2]; Calder, S. ^[3]; Mashirov, A. V. ^[2]; Kamantsev, A. P. ^[2]; Dilmieva, E. T. ^[2]; Gonzalez-Legarreta, L. ^[4]; Grande, B. H. ^[4]; Vega, V. V. ^[4]; Kayani, A. ^[1]

Western Michigan Univ., Kalamazoo MI (United States)
Kotelnikov Institute of Radio-engineering and Electronics of RAS, Moscow (Russia)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Oviedo, Oviedo (Spain)

Magnetic cooling is a green cooling technology, which is more energy efficient than existing fluid-compression cooling machines. Ni₄₁Mn₃₉In₁₂Co₈ alloy, which demonstrates promising magnetocaloric performances, was investigated using neutron diffraction and thermomagnetic measurements. The austenite structure is cubic L2₁ $$(Fm\bar{3}m),$$ while that of the martensite is a mix of 8 and 6 M modulated monoclinic structures $$(P\quad 1\quad 2/m\quad 1).$$ The austenitic site occupancy refinements reveal that all substituting Co atoms occupy Ni-sites. Most Mn atoms (65%) are in the Mn-sites and the rest go to In-sites (about 35%) and Ni-sites (less than 5%). This disorder of the magnetic atoms (Mn, Ni and Co) in the austenitic phase remains unchanged during the martensitic transition. The distortions of the interatomic distances due to the modulation of the martensitic structures further enhance the disorder in the magnetic interactions. Thermomagnetic measurements indicate that the austenitic phase is ferromagnetic. Cooling to below 250 K, where the alloy loses its ferromagnetic nature, and down to 50 K, the lack of any antiferromagnetic Bragg peaks suggests no antiferromagnetic ordering in the martensitic phase. Here, at very low temperatures in the martensitic phase, spin glass magnetic nature is identified by magnetic measurements, and the spin-glass transition temperature is ~19 K.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1485318

Alternate ID(s):: OSTI ID: 22874492

Journal Information:: Smart Materials and Structures, Journal Name: Smart Materials and Structures Journal Issue: 8 Vol. 25; ISSN 0964-1726

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Crystalline structure and magnetic behavior of the Ni41Mn39In12Co8 alloy demonstrating giant magnetocaloric effect

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Crystalline structure and magnetic behavior of the Ni₄₁Mn₃₉In₁₂Co₈ alloy demonstrating giant magnetocaloric effect