Room-temperature Magnetocaloric Effect and Magneto-resistance Effect of Co0.525Fe0.475MnP Compound

doi:10.11901/1005.3093.2018.395

Chinese Journal of Materials Research

2019, Vol. 33

Issue (2): 124-130 DOI: 10.11901/1005.3093.2018.395

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Room-temperature Magnetocaloric Effect and Magneto-resistance Effect of Co_0.525Fe_0.475MnP Compound

Naikun SUN(

),Dehan ZHONG,Zengxin REN,Yang ZHANG,Xiaoyun LIU(

)

School of Science, Shenyang Ligong University, Shenyang 110159, China

Cite this article:

Naikun SUN,Dehan ZHONG,Zengxin REN,Yang ZHANG,Xiaoyun LIU. Room-temperature Magnetocaloric Effect and Magneto-resistance Effect of Co_0.525Fe_0.475MnP Compound. Chinese Journal of Materials Research, 2019, 33(2): 124-130.

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Abstract

The Co_0.525Fe_0.475MnP compound of single-phase with Co₂P-crystallographic structure was prepared by a multi-step solid sintering process. Co_0.525Fe_0.475MnP exhibits two successive magnetic transitions with the increasing temperature: a first-order magnetic phase transition from the antiferromagnetic (AF) to the ferromagnetic (FM) state at 285 K, and a second-order magnetic phase transition to the paramagnetic (PM) state at 375 K. The maximum value of magnetic-entropy change for a field change from 0 to 5 T is 1.1 J/(kg?K) at 303 K and -2.0 J/(kg?K) at 383 K. With the decreasing temperature, a minimum resistivity emerges near the T_FM-AF originating from the competition between antiferromagnetism and ferromagnetism. The compound experiences a metal-insulator transition at 35 K, which can be ascribed to spin disorder due to the Fe substitution for Co. The value of maximum magnetoresistance ratio is -2.5% at 200 K in an external magnetic field of 5 T. Magnetoresistance value decreases rapidly above antiferromagnetic temperature, confirming that the magnetoresistance originates from the influence of external magnetic field on the antiferromagnetic state.

Key words: metallic materials magnetocaloric effect magneto-resistance effect metal-insulator transition first-order phase transition

Received: 18 June 2018

ZTFLH:

TM271.4

Fund: Supported by National Natural Science Foundation of China(51771197);Opening Foundation Key Laboratory of Laser and Optical Technology of Liaoning Province(4771004kfs49)

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	Naikun SUN
	Dehan ZHONG
	Zengxin REN
	Yang ZHANG
	Xiaoyun LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.395 OR https://www.cjmr.org/EN/Y2019/V33/I2/124

Fig.1 X-ray diffraction pattern of the Co_0.525Fe_0.475MnP compound at room temperature

Table 1 Lattice parameters, T_AF-FM and T_C of Co_1-_xFe_xMnP compounds

Fig.2 SEM images of Co_0.525Fe_0.475 MnP compound (a) low magnification, (b) high magnification

Fig.3 Temperature dependence of the magnetization of Co_0.525Fe_0.475MnP compound measured in ZFC and FC processes at 0.1 T. (The inset shows the first derivative of the magnetization)

Fig.4 Curves of isothermal magnetization of Co_0.525Fe_0.475MnP at temperatures near (a) T_AF-FM (b) T_C (The insets are Arrott curves at temperatures near (a) T_AF-FM (b) T_C)

Fig.5 Temperature dependence of magnetic-entropy of Co_0.525Fe_0.475MnP compound

Fig.5 Co_0.525Fe_0.475MnP compound: (a) temperature dependence of the resistivity (the inset is dρ/dT curve at 5 T), (b) temperature dependence of the MR at 5 T

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