Acta Metallurgica Sinica (English Letters) ›› 2012, Vol. 25 ›› Issue (1): 76-80.DOI: 10.11890/1006-7191-121-76

• 研究论文 • 上一篇    下一篇

Magnetic transition and magnetocaloric effect in MnAs0.9P0.1 compound

孙乃坤1,柳峰2,高印博2,刘进军3   

  1. 1. Shenyang ligong university
    2. 沈阳理工大学
    3. Faculty of Materials Science & Chemical Engineering, Ningbo University
  • 收稿日期:2011-09-20 修回日期:2011-11-20 出版日期:2012-02-25 发布日期:2012-02-16
  • 通讯作者: 孙乃坤

Magnetic transitions and magnetocaloric effect in MnAs0.9P0.1

Naikun SUN1, Feng LIU1, Yinbo GAO1, Jinjun LIU2   

  1. 1. School of Science, Shenyang Ligong University, Shenyang 110159, China
    2. Faculty of Materials Science & Chemical Engineering, Ningbo University,Ningbo 315211, China
  • Received:2011-09-20 Revised:2011-11-20 Online:2012-02-25 Published:2012-02-16
  • Contact: Naikun SUN

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摘要： The MnAs0.9P0.1 compound exhibits a multistep order-order magnetic transition from a helimagnetic γ-phase with Hα-type magnetic order to a ferromagnetic β-phase at 80 K and then to a helimagnetic α-phase at 203 K. The γ-β transition exhibits the characteristic of first-order transition with a thermal hysteresis as large as 6 K, while the β-α transition is determined to be second order with a thermal hysteresis lower than 2 K and without magnetic hysteresis. In accordance with the two successive helimagnetism-related transitions, magnetic-entropy changes of -2.08 J/kg?K at 202.5 K for a 5 T field change and 0.09 J/kg?K at 82.5 K for a 1 T field change are obtained. The study on the magnetocaloric effects originating from a Hα-type magnetic order to a ferromagnetic order transition may open a new route to explore good candidates for magnetic refrigeration.

Abstract: The compound MnAs0.9P0.1 exhibits a multistep magnetic order-order transition from a helimagnetic γ-phase with Hα-type magnetic order to a ferromagnetic β-phase at 80 K and then to a helimagnetic α-phase at 203 K. The γ-β transition exhibits the characteristics of a first-order transition with a thermal hysteresis as large as 6 K, while the β-α transition is of second order with a thermal hysteresis smaller than 2 K and without magnetic hysteresis. With these two successive helimagnetism-related transitions, magnetic-entropy changes of -2.1 J/(kg•K) at 203~K for a field change from 0 to 5 T and 0.1 J/(kg•K) at 83 K for a field change from 0 to 1 T are obtained. Investigation of the magnetocaloric effect associated with a transition from Hα-type magnetic order to FM order may open a new route to explore candidates for magnetic refrigeration.

Key words: Magnetocaloric effect, Hysteresis, first-order transition