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Reducing the operational magnetic field in the prototype magnetocaloric system by approaching the single cluster size limit
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View: Figures


Image of FIG. 1.
FIG. 1.

The phase diagram for a sample in increasing magnetic field after being cooled in a zero field. The dashed lines indicate how the phase transition boundaries are changed when the sample is fragmented into pieces of the order of . The open and closed squares bound the onset and offset of the field-increasing AFM-FM transition, respectively.

Image of FIG. 2.
FIG. 2.

Plot showing magnetization, heat capacity, and magnetostriction as functions of the magnetic field at . Top left is for the bulk sample (solid squares) and the single size fragment (open triangles). Bottom left is for the collection of fragmented samples (inverted open triangles) and the ground powder of typical particle size under (grey solid circles). Right-hand side from the top are: The magnetization normalized by the saturation magnetization, the heat capacity, and the striction change in a single size fragment. The striction is measured by the relative change of resistance of the thin-film resistor in mechanical contact with the sample. Note that the phase transition occurs in a steplike manner, demonstrating that there are only a few clusters within the sample.

Image of FIG. 3.
FIG. 3.

Hall probe images taken at in increasing magnetic field for the bulk sample. The image corresponds to a region in the center of the sample and represents the spatial variation of the magnetization at the sample surface normalized by that in the fully FM state . The normalized values are chosen to represent the AFM phase (white). Values (intermediate between the AFM and FM states) are colored gray, and values are defined as the FM state and colored black. The gray regions either occur due to a fine scale phase separation that exists on length scales smaller than can be resolved by our equipment, i.e., smaller than , or they may be caused by FM domains that are below the sample surface and thus generate lower induction at the Hall sensor.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Reducing the operational magnetic field in the prototype magnetocaloric system Gd5Ge4 by approaching the single cluster size limit