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

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:477

Article

Fries, M.¹  Gottschall, T.²  Scheibel, F.^1,3,4  Pfeuffer, L.¹  Skokov, K. P.¹  Skourski, I²  Acet, M.^3,4  Farle, M.^3,4  Wosnitza, J.^2,5  Gutfleisch, O.¹ 

[1] Tech Univ Darmstadt, Inst Mat Wissensch, D-64287 Darmstadt, Germany

[2] Helmholtz Zentrum Dresden Rossendorf, Dresden High Magnet Field Lab HLD EMFL, D-01328 Dresden, Germany

[3] Univ Duisburg Essen, Fak Phys, D-47057 Duisburg, Germany

[4] Univ Duisburg Essen, CENIDE, D-47057 Duisburg, Germany

[5] Tech Univ Dresden, Inst Festkorper & Mat phys, D-01062 Dresden, Germany

关键词: Magnetic cooling;    Dynamical effects;    First-order transition;    Fe2P;    High magnetic-fields;   

DOI  :  10.1016/j.jmmm.2018.12.086

来源: Elsevier

【 摘 要 】

The adiabatic temperature change Delta T-ad 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 Delta T-ad. 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 Delta T-ad.

【 授权许可】

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