The large magnetocaloric effect (MCE), which accompanies the first order ferromagnetic/anti-ferromagnetic transition in CsCl-ordered Fe-Rh alloys, has been investigated by measurements in slowly cycled magnetic fields of up to 2 T in magnitude for a range of temperatures, 300 K < T < 350 K. A bulk sample with composition Fe50.4Rh49.6 was used and the results were compared with those produced by the ab-initio density functional theory-based disordered local moment theory of the MCE. The measurements revealed an irreversibility effect in which the temperature of the material did not return to its initial value following several cycles of the magnetic field. These observations were explained in the framework of the ab-initio theory for the first order transition in which the consequences of the incomplete long range compositional order and small compositional inhomogeneities of the sample were included. The mean value of the long range order parameter S used in the theoretical work was 0.985, close to the value obtained experimentally from XRD measurements. The sample inhomogeneities were modeled by regions in the sample having a distribution of S values with narrow half-width 0.004 about the mean value. The influence of such compositional disorder on both the transition temperature (323.5 K) and MCE adiabatic temperature change (ΔT = 7.5 K) was also studied.
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9 May 2016
Research Article|
May 10 2016
Influence of structural defects on the magnetocaloric effect in the vicinity of the first order magnetic transition in Fe50.4Rh49.6
V. I. Zverev;
V. I. Zverev
1Faculty of Physics,
M.V. Lomonosov Moscow State University
, 119991 Moscow, Russia
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A. M. Saletsky;
A. M. Saletsky
1Faculty of Physics,
M.V. Lomonosov Moscow State University
, 119991 Moscow, Russia
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R. R. Gimaev;
R. R. Gimaev
a)
1Faculty of Physics,
M.V. Lomonosov Moscow State University
, 119991 Moscow, Russia
2
Advanced Magnetic Technologies and Consulting LLC
, 142190 Troitsk, Russia
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A. M. Tishin;
A. M. Tishin
1Faculty of Physics,
M.V. Lomonosov Moscow State University
, 119991 Moscow, Russia
2
Advanced Magnetic Technologies and Consulting LLC
, 142190 Troitsk, Russia
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T. Miyanaga
;
T. Miyanaga
3Department of Mathematics and Physics,
Hirosaki University
, Hirosaki, Aomori 036-8561, Japan
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J. B. Staunton
J. B. Staunton
4Department of Physics,
University of Warwick
, Coventry CV4 7AL, United Kingdom
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a)
Author to whom correspondence should be addressed. Electronic mail: gimaev@physics.msu.ru
Appl. Phys. Lett. 108, 192405 (2016)
Article history
Received:
February 17 2016
Accepted:
April 30 2016
Citation
V. I. Zverev, A. M. Saletsky, R. R. Gimaev, A. M. Tishin, T. Miyanaga, J. B. Staunton; Influence of structural defects on the magnetocaloric effect in the vicinity of the first order magnetic transition in Fe50.4Rh49.6. Appl. Phys. Lett. 9 May 2016; 108 (19): 192405. https://doi.org/10.1063/1.4949355
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