Enhanced exchange bias and coercivity arising from heterojunctions in Ni-NiO nanocomposites

Xiu Juan Yao; Xue Min He; Xue Yin Song; Qian Ding; Zhi Wen Li; Wei Zhong; Chak Tong Au; You Wei Du

doi:10.1039/c3cp55316g

Enhanced exchange bias and coercivity arising from heterojunctions in Ni-NiO nanocomposites

Xiu Juan Yao, Xue Min He, Xue Yin Song, Qian Ding, Zhi Wen Li, Wei Zhong^*, Chak Tong Au, You Wei Du

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › peer-review

35 Citations (Scopus)

Abstract

By a reflux process, we prepared Ni-NiO nanocomposites that are face-centered cubic (fcc). By tuning the precursor concentration, we controlled the Ni content in the Ni-NiO nanocomposites. We found that both the interface of Ni and NiO crystal lattices and the weight fraction of Ni have significant impacts on their magnetic properties. There is increase of saturation magnetization and decrease of coercivity (H_C) with the increase of the Ni weight fraction. Large exchange bias (H_E) and enhanced H _C are observed at 5 K, which are due to the creation of heterojunctions at the interfaces of ferromagnetic Ni and antiferromagnetic NiO. After optimization, it is observed that the Ni-NiO nanocomposites with an Ni content of 2.6% show an H_C and H_E of 1068 and 350 Oe, respectively.

Original language	English
Pages (from-to)	6925-6930
Number of pages	6
Journal	Physical Chemistry Chemical Physics
Volume	16
Issue number	15
DOIs	https://doi.org/10.1039/c3cp55316g
Publication status	Published - 21 Apr 2014

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@article{01101486dba24b2890de6bbe269e4385,

title = "Enhanced exchange bias and coercivity arising from heterojunctions in Ni-NiO nanocomposites",

abstract = "By a reflux process, we prepared Ni-NiO nanocomposites that are face-centered cubic (fcc). By tuning the precursor concentration, we controlled the Ni content in the Ni-NiO nanocomposites. We found that both the interface of Ni and NiO crystal lattices and the weight fraction of Ni have significant impacts on their magnetic properties. There is increase of saturation magnetization and decrease of coercivity (HC) with the increase of the Ni weight fraction. Large exchange bias (HE) and enhanced H C are observed at 5 K, which are due to the creation of heterojunctions at the interfaces of ferromagnetic Ni and antiferromagnetic NiO. After optimization, it is observed that the Ni-NiO nanocomposites with an Ni content of 2.6% show an HC and HE of 1068 and 350 Oe, respectively.",

author = "Yao, {Xiu Juan} and He, {Xue Min} and Song, {Xue Yin} and Qian Ding and Li, {Zhi Wen} and Wei Zhong and Au, {Chak Tong} and Du, {You Wei}",

note = "The authors are very grateful for the financial support from National Natural Science Foundation (Grant No. 11174132), National Key Project for Basic Research (Grant No. 2011CB922102 and 2012CB932304), Innovation Program for Doctoral Research of Jiangsu Province (Grant No. CXZZ13_0035) and PAPD, the People{\textquoteright}s Republic of China.",

year = "2014",

month = apr,

day = "21",

doi = "10.1039/c3cp55316g",

language = "English",

volume = "16",

pages = "6925--6930",

journal = "Physical Chemistry Chemical Physics",

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publisher = "Royal Society of Chemistry",

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TY - JOUR

T1 - Enhanced exchange bias and coercivity arising from heterojunctions in Ni-NiO nanocomposites

AU - Yao, Xiu Juan

AU - He, Xue Min

AU - Song, Xue Yin

AU - Ding, Qian

AU - Li, Zhi Wen

AU - Zhong, Wei

AU - Au, Chak Tong

AU - Du, You Wei

N1 - The authors are very grateful for the financial support from National Natural Science Foundation (Grant No. 11174132), National Key Project for Basic Research (Grant No. 2011CB922102 and 2012CB932304), Innovation Program for Doctoral Research of Jiangsu Province (Grant No. CXZZ13_0035) and PAPD, the People’s Republic of China.

PY - 2014/4/21

Y1 - 2014/4/21

N2 - By a reflux process, we prepared Ni-NiO nanocomposites that are face-centered cubic (fcc). By tuning the precursor concentration, we controlled the Ni content in the Ni-NiO nanocomposites. We found that both the interface of Ni and NiO crystal lattices and the weight fraction of Ni have significant impacts on their magnetic properties. There is increase of saturation magnetization and decrease of coercivity (HC) with the increase of the Ni weight fraction. Large exchange bias (HE) and enhanced H C are observed at 5 K, which are due to the creation of heterojunctions at the interfaces of ferromagnetic Ni and antiferromagnetic NiO. After optimization, it is observed that the Ni-NiO nanocomposites with an Ni content of 2.6% show an HC and HE of 1068 and 350 Oe, respectively.

AB - By a reflux process, we prepared Ni-NiO nanocomposites that are face-centered cubic (fcc). By tuning the precursor concentration, we controlled the Ni content in the Ni-NiO nanocomposites. We found that both the interface of Ni and NiO crystal lattices and the weight fraction of Ni have significant impacts on their magnetic properties. There is increase of saturation magnetization and decrease of coercivity (HC) with the increase of the Ni weight fraction. Large exchange bias (HE) and enhanced H C are observed at 5 K, which are due to the creation of heterojunctions at the interfaces of ferromagnetic Ni and antiferromagnetic NiO. After optimization, it is observed that the Ni-NiO nanocomposites with an Ni content of 2.6% show an HC and HE of 1068 and 350 Oe, respectively.

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U2 - 10.1039/c3cp55316g

DO - 10.1039/c3cp55316g

M3 - Journal article

AN - SCOPUS:84897876533

SN - 1463-9076

VL - 16

SP - 6925

EP - 6930

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

IS - 15

ER -

Enhanced exchange bias and coercivity arising from heterojunctions in Ni-NiO nanocomposites

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