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(a) loops for sample LaFeCoSi–1 taken at 209 K; the narrow inner loop is at 0.02 T/min (indicated by single arrows); the middle loop is at 0.2 T/min; and the wide outer loop is at 0.7 T/min (indicated by double arrows). The critical fields to are indicated for the 0.7 T/min curve. Inset to (a) shows temperature dependence of . (b) Sample temperature relative to the bath . The three loops correspond to the loops in part (a).
Magnetic field hysteresis vs the field sweep-rate for (a) LaFeCoSi–1 plate (square) and fragment (circle) at 209 K, and (c) LaFeCoSi–2 plate (triangle) and fragment (diamond) and Gd needle (star) samples at 295 K. The LaFeCoSi–1 data is fitted by Eq. (1) (crosses) in part (a). The magnetic entropy change in 2 T field change vs temperature for (b) LaFeCoSi–1 plate and fragment, and (d) LaFeCoSi–2 plate and fragment and Gd needle samples.
Open symbols show change in sample temperature measured by the Pt100 sensor as the field is reduced from to zero ( corresponds to ) for LaFeCoSi–1 at 209 K (squares −0.2 T/min, circles −0.5 T/min, and triangles −0.7 T/min). Closed symbols show extracted from change in paramagnetic moment in over the same field range. Inset illustrates the effect of field sweep-rate on the paramagnetic moment in .
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