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Effect of severe plastic deformation on the specific heat and magnetic properties of cold rolled Gd sheets

Taskaev, S. and Skokov, K. and Khovaylo, V. and Buchelnikov, V. and Pellenen, A. and Karpenkov, D. and Ulyanov, M. and Bataev, D. and Usenko, A. and Lyange, M. and Gutfleisch, O. (2015):
Effect of severe plastic deformation on the specific heat and magnetic properties of cold rolled Gd sheets.
117, In: Journal of Applied Physics, (12), AIP Publishing, p. 123914, ISSN 0021-8979, [Online-Edition: http://dx.doi.org/10.1063/1.4916377],
[Article]

Abstract

We report on specific heat and magnetic properties of thin Gd sheets obtained by means of a cold rolling technique. At temperatures well below Curie temperature TC , the cold rolling has a minor impact on the specific heat Cp . However, a well defined λ-type anomaly of Cp seen in the vicinity of TC in a polycrystalline Gd sample is markedly suppressed in the severely deformed samples. Depression of the λ peak is due to a large decrease of magnetization that presumably originates in a local magnetic anisotropy induced by the severe plastic deformation. Results of calculation of magnetocaloric effect from the Cp and magnetization data indicate that the magnetocaloric effect gradually decreases as the degree of plastic deformation increases. This trend is further confirmed by the direct measurements of the adiabatic temperature change ΔTad .

Item Type: Article
Erschienen: 2015
Creators: Taskaev, S. and Skokov, K. and Khovaylo, V. and Buchelnikov, V. and Pellenen, A. and Karpenkov, D. and Ulyanov, M. and Bataev, D. and Usenko, A. and Lyange, M. and Gutfleisch, O.
Title: Effect of severe plastic deformation on the specific heat and magnetic properties of cold rolled Gd sheets
Language: English
Abstract:

We report on specific heat and magnetic properties of thin Gd sheets obtained by means of a cold rolling technique. At temperatures well below Curie temperature TC , the cold rolling has a minor impact on the specific heat Cp . However, a well defined λ-type anomaly of Cp seen in the vicinity of TC in a polycrystalline Gd sample is markedly suppressed in the severely deformed samples. Depression of the λ peak is due to a large decrease of magnetization that presumably originates in a local magnetic anisotropy induced by the severe plastic deformation. Results of calculation of magnetocaloric effect from the Cp and magnetization data indicate that the magnetocaloric effect gradually decreases as the degree of plastic deformation increases. This trend is further confirmed by the direct measurements of the adiabatic temperature change ΔTad .

Journal or Publication Title: Journal of Applied Physics
Volume: 117
Number: 12
Publisher: AIP Publishing
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 08 Jan 2016 09:39
Official URL: http://dx.doi.org/10.1063/1.4916377
Identification Number: doi:10.1063/1.4916377
Funders: The authors gratefully acknowledge the financial support of the Ministry of Education and Science of the Russian Federation in the framework of Increase Competitiveness Program of NUST “MISiS” and financial support of the RFBR 12-07-00676-a., The authors also gratefully acknowledge the financial support of RF President MD-770.2014.2, RSF 14-12-00570 (numerical simulation) grants and of the DFG SPP1599 programme.
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