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Tuning the magnetocaloric properties of the Heusler alloys
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Image of FIG. 1.
FIG. 1.

The temperature dependence of magnetization of alloys under various applied magnetic fields.

Image of FIG. 2.
FIG. 2.

The magnetic entropy change as a function of temperature for for . The relative cooling powers are represented by the filled areas (with vertical, cross-mesh, and horizontal lines for  = 0, 0.05, and 0.1 samples, respectively).

Image of FIG. 3.
FIG. 3.

(a) The vs curves recorded at 300 K for all three samples. (b) The vs curves in the field-cooled cooling and warming cycles under the magnetic field of 0.02 T.

Image of FIG. 4.
FIG. 4.

Observed ( ) and Rietveld refined (solid lines) neutron diffraction patterns for ( = 0, 0.05, and 0.1) at 300 and 22 K. The difference between the observed and calculated patterns is also shown at the bottom of each panel by solid lines. The vertical bars indicate the positions of allowed nuclear (top) and magnetic (bottom) Bragg peaks. The values of goodness of fit , Bragg R-factor , and magnetic R-factor are also given.

Image of FIG. 5.
FIG. 5.

Temperature dependence of site averaged Mn moments obtained from the Rietveld refinement of the neutron diffraction data. The solid joining lines are to guide the eyes. The vertical lines represent the error bars.

Image of FIG. 6.
FIG. 6.

The magnetic entropy change as a function of for samples. The dotted lines are guide to the eye. Each solid line is the linear fit for a single value of .


Generic image for table
Table I.

The maximum magnetic entropy change and the RCP for the present system and that reported in the literature for some alloys with large MCE around room temperature.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Tuning the magnetocaloric properties of the Ni2+xMn1−xSn Heusler alloys