Issue 52, 2019

Large exchange bias and enhanced coercivity in strongly-coupled Ni/NiO binary nanoparticles

Abstract

In this study, Ni/NiO binary nanoparticles are synthesized utilizing a reflux method combined with a calcination process. The average size of the nanoparticles is 5–20 nm and the Ni content is 3.55%. Both the microstructures of the Ni/NiO interface and the states of different phases have significant impacts on the magnetic properties. By tuning the temperature and the cooling field during the loop measurement, the change rule of several critical parameters such as coercivity HC and exchange bias HE was complicated in nature. Both large HE (482 Oe) and enhanced HC (1335 Oe) were observed at 5 K, mainly due to the strong coupling interaction between Ni and NiO components. For current studies of the Ni/NiO binary nanoparticles, the complex magnetic behaviors are related to (i) the ferromagnetic contribution of Ni nanoparticles, (ii) the intrinsic antiferromagnetism of the volume phase of NiO, and (iii) the spin-glass-like characteristic corresponding to the frozen disordered state at the surface of partial NiO particles. The comprehensive effect of these three magnetic structures promotes the generation of a strongly-coupled Ni/NiO binary system, and improves the magnetic performance.

Graphical abstract: Large exchange bias and enhanced coercivity in strongly-coupled Ni/NiO binary nanoparticles

Article information

Article type
Paper
Submitted
30 Apr 2019
Accepted
18 Sep 2019
First published
24 Sep 2019
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2019,9, 30195-30206

Large exchange bias and enhanced coercivity in strongly-coupled Ni/NiO binary nanoparticles

X. He, Y. Xu, X. Yao, C. Zhang, Y. Pu, X. Wang, W. Mao, Y. Du and W. Zhong, RSC Adv., 2019, 9, 30195 DOI: 10.1039/C9RA03242H

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