Effects of the Mn/Co ratio on the magnetic transition and magnetocaloric properties of Mn1+xCo1-xGe alloys

doi:10.1088/1674-1056/20/8/087502

中国物理B ›› 2011, Vol. 20 ›› Issue (8): 87502-087502.doi: 10.1088/1674-1056/20/8/087502

Effects of the Mn/Co ratio on the magnetic transition and magnetocaloric properties of Mn_1+xCo_1-xGe alloys

马胜灿, 王敦辉, 轩海成, 沈凌佳, 曹庆琪, 都有为

National Laboratory of Solid State Microstructures and Key Laboratory of Nanomaterials for Jiangsu Province, Nanjing University, Nanjing 210093, China vspace1mm

收稿日期:2011-02-20 修回日期:2011-03-10 出版日期:2011-08-15 发布日期:2011-08-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 50701022, 51001019, and 50831006) and the Program for New Century Excellent Talents of China (Grant No. NCET-08-0278).

Effects of the Mn/Co ratio on the magnetic transition and magnetocaloric properties of Mn_1+xCo_1-xGe alloys

Ma Sheng-Can(马胜灿), Wang Dun-Hui(王敦辉)^†, Xuan Hai-Cheng(轩海成), Shen Ling-Jia(沈凌佳), Cao Qing-Qi(曹庆琪), and Du You-Wei(都有为)

National Laboratory of Solid State Microstructures and Key Laboratory of Nanomaterials for Jiangsu Province, Nanjing University, Nanjing 210093, China

Received:2011-02-20 Revised:2011-03-10 Online:2011-08-15 Published:2011-08-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 50701022, 51001019, and 50831006) and the Program for New Century Excellent Talents of China (Grant No. NCET-08-0278).

摘要/Abstract

摘要： We have investigated the magnetic transition and magnetocaloric effects of Mn_1+xCo_1-xGe alloys by tuning the ratio of Mn/Co. With increasing Mn content, a series of first-order magnetostructural transitions from ferromagnetic to paramagnetic states with large changes of magnetization are observed at room temperature. Further increasing the content of Mn (x=0.11) gives rise to a single second-order magnetic transition. Interestingly, large low-field magnetic entropy changes with almost zero magnetic hysteresis are observed in these alloys. The effects of Mn/Co ratio on magnetic transition and magnetocaloric effects are discussed in this paper.

关键词: Mn/Co ratio, magnetic transition, magnetocaloric properties, magnetic hysteresis losses

Abstract: We have investigated the magnetic transition and magnetocaloric effects of Mn_1+xCo_1-xGe alloys by tuning the ratio of Mn/Co. With increasing Mn content, a series of first-order magnetostructural transitions from ferromagnetic to paramagnetic states with large changes of magnetization are observed at room temperature. Further increasing the content of Mn (x=0.11) gives rise to a single second-order magnetic transition. Interestingly, large low-field magnetic entropy changes with almost zero magnetic hysteresis are observed in these alloys. The effects of Mn/Co ratio on magnetic transition and magnetocaloric effects are discussed in this paper.

Key words: Mn/Co ratio, magnetic transition, magnetocaloric properties, magnetic hysteresis losses

中图分类号: (Magnetocaloric effect, magnetic cooling)

75.30.Sg

75.50.Cc (Other ferromagnetic metals and alloys)

马胜灿, 王敦辉, 轩海成, 沈凌佳, 曹庆琪, 都有为. Effects of the Mn/Co ratio on the magnetic transition and magnetocaloric properties of Mn_1+xCo_1-xGe alloys[J]. 中国物理B, 2011, 20(8): 87502-087502.

Ma Sheng-Can(马胜灿), Wang Dun-Hui(王敦辉), Xuan Hai-Cheng(轩海成), Shen Ling-Jia(沈凌佳), Cao Qing-Qi(曹庆琪), and Du You-Wei(都有为) . Effects of the Mn/Co ratio on the magnetic transition and magnetocaloric properties of Mn_1+xCo_1-xGe alloys[J]. Chin. Phys. B, 2011, 20(8): 87502-087502.

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Effects of the Mn/Co ratio on the magnetic transition and magnetocaloric properties of Mn_1+xCo_1-xGe alloys

Effects of the Mn/Co ratio on the magnetic transition and magnetocaloric properties of Mn_1+xCo_1-xGe alloys

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