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arXiv · 1907.02307

Dynamics of the magnetoelastic phase transition and adiabatic temperature change in Mn1.3Fe0.7P0.5Si0.55

M. Fries·T. Gottschall·F. Scheibel·L. Pfeuffer·K. P. Skokov·I. Skourski·M. Acet·M. Farle·J. Wosnitza·O. Gutfleisch
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Abstract

The adiabatic temperature change DTad of a Mn1.3Fe0.7P0.5Si0.55 Fe2P-type alloy was measured under different magnetic field-sweep rates from 0.93 Ts-1 to 2870 Ts-1. We find a field-sweep-rate independent magnetocaloric effect due to a partial alignment of magnetic moments in the paramagnetic region overlapping with the magnetocaloric effect of the first-order phase transition. Additionally, the first-order phase transition is not completed even in fields up to 20 T leading to a non-saturating behavior of DTad. Measurements in different pulsed fields reveal that the first-order phase transition cannot follow the fast field changes as previously assumed, resulting in a distinct field-dependent hysteresis in DTad.

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M. Fries, T. Gottschall, F. Scheibel, L. Pfeuffer, K. P. Skokov, I. Skourski, M. Acet, M. Farle, J. Wosnitza, O. Gutfleisch. 2019-07-04. Dynamics of the magnetoelastic phase transition and adiabatic temperature change in Mn1.3Fe0.7P0.5Si0.55. https://doi.org/10.1016/j.jmmm.2018.12.086

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