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Adiabatic magnetocaloric temperature change in polycrystalline gadolinium – A new approach highlighting reversibility
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1.
1. M. Ghahremani, Y. Jin, L. H. Bennett, E. Della Torre, H. ElBidweihy and S. Gu, IEEE Trans. Magn. 48, 11 (2012).
2.
2. W. J. Boettinger, U. R. Kattner, and K-W , Moon, NIST Special Publication. 960-15 (2006) [Online] http://www.nist.gov/customcf/get_pdf.cfm?pub_id=901091.
3.
3. M. D. Kuz'min, K. P. Skokov, D. Yu. Karpenkov, J. D. Moore, M. Richter, and O. Gutfleisch, Appl. Phys. Lett. 99, 012501 (2011).
http://dx.doi.org/10.1063/1.3607279
4.
4. V. Franco, A. Conde, J. M. Romero-Enrique, Y. I. Spichkin, V. I. Zverev, and A. M. Tishin, J. Appl. Phys. 106, 103911 (2009).
http://dx.doi.org/10.1063/1.3261843
5.
5. Y. I. Spichkin, A. V. Derkach, A. M. Tishin, M. D. Kuz'min, A. S. Chernyshov, K. A. Gschneidner Jr., and V. K. Pecharsky, J. Magn. Magn. Mater. 316, e555 (2007).
http://dx.doi.org/10.1016/j.jmmm.2007.03.017
6.
6. F. Shir, L. Bennett, Instr. Sci. Tech. 33, 661 (2005).
http://dx.doi.org/10.1080/10739140500311239
7.
7. S. Yu. Dan'kov, A. M. Tishin, V. K. Pecharsky, and K. A. Gschnidner Jr., Phys. Rev. B 57, 3478 (1998).
http://dx.doi.org/10.1103/PhysRevB.57.3478
8.
8. J. Y. Law, V. Franco and R. V. Ramanujan, J. Appl. Phys. 110, 023907 (2011).
http://dx.doi.org/10.1063/1.3613666
9.
9. W. F. Giauque, J. Am. Chem. Soc. 49, 1864 (1927).
http://dx.doi.org/10.1021/ja01407a003
10.
10. H. H. Potter, Proc. Royal Society of London 146, 362 (1934).
http://dx.doi.org/10.1098/rspa.1934.0161
11.
11. P. Weiss and R. Forrer, Ann. Phys. 5, 153 (1926).
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FIG. 1.

Design schematic of the magnetocaloric direct temperature test system.

Image of FIG. 2.

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FIG. 2.

The adiabatic magnetocaloric temperature change, ΔT, of polycrystalline Gd versus sample initial temperature, T i , measured during the magnetization and demagnetization processes. The squares and the circles highlight ΔT peak for various applied magnetic fields during the magnetization and demagnetization processes, respectively. During magnetization, ΔT peak occurs at the same initial temperature of 293.8 K for different applied fields, while during demagnetization ΔT peak , which is of negative value, occurs at different initial temperatures ranging from 294.3 K to 298.3 K.

Image of FIG. 3.

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FIG. 3.

Adiabatic temperature change, ΔT, of polycrystalline Gd versus the average temperature change, (T avg ), measured during both the magnetization and demagnetization processes for various applied fields. The solid lines and the circled lines represent the ΔT measurements during the magnetization and demagnetization processes, respectively. The red squares highlight the nearly-identical peaks of ΔTT peak ) during the two processes. The demagnetization curves are approximate negative images of the magnetization curves.

Image of FIG. 4.

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FIG. 4.

Maximum adiabatic temperature change, ΔT peak , of polycrystalline Gd versus T avg , measured during both the magnetization and demagnetization processes for various applied fields. The squares and the circles highlight the measured data points during the magnetization and demagnetization processes, respectively.

Image of FIG. 5.

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FIG. 5.

Maximum adiabatic temperature change, ΔT peak , of polycrystalline Gd versus applied magnetic field, measured during both the magnetization and demagnetization processes. The squares and the circles highlight the measured data points, which lie perfectly on top of each other, during the magnetization and demagnetization processes, respectively. The straight dashed lines are the applied field dependence of ΔT peak .

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/content/aip/journal/adva/2/3/10.1063/1.4748131
2012-08-22
2014-04-19

Abstract

The adiabatic temperature change (ΔT) during the magnetization and demagnetization processes of bulk gadolinium is directly measured for several applied magnetic fields in the temperature range 285 K to 305 K. During the magnetization process, ΔTmeasurements display the same maximum for each applied field when plotted against the initial temperature (T i ). However, during the demagnetization process, the maximum ΔT varies for each applied field. This discrepancy between the magnetization and demagnetizationmeasurements appears inconsistent with the reversibility of the magnetocaloric effect. A new approach is undertaken to highlight the reversibility of the magnetocaloric effect by plotting ΔT against the average temperature change (T avg ) instead of T i . The value of T avg which corresponds to the maximum ΔT is found to increase linearly with the applied magnetic field, consistently for both the magnetization and demagnetizationmeasurements. Solving the linear-fitting equations of these measurements gives a new, and more precise, Curie temperaturemeasurement. This new approach confirmed that the relationship between the maximum adiabatic temperature change (ΔT peak ) and the applied magnetic field is perfectly linear.

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Scitation: Adiabatic magnetocaloric temperature change in polycrystalline gadolinium – A new approach highlighting reversibility
http://aip.metastore.ingenta.com/content/aip/journal/adva/2/3/10.1063/1.4748131
10.1063/1.4748131
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