脉冲激光辐照制备的NiO/Ni复合粒子磁性的调控

Tailoring of Magnetic Properties of NiO/Ni Composite Particles Fabricated by Pulsed Laser Irradiation.

作者信息

Swiatkowska-Warkocka Zaneta, Pyatenko Alexander, Shimizu Yoshiki, Perzanowski Marcin, Zarzycki Arkadiusz, Jany Benedykt R, Marszalek Marta

机构信息

Institute of Nuclear Physics Polish Academy of Sciences, PL-31342 Krakow, Poland.

National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8565, Japan.

出版信息

Nanomaterials (Basel). 2018 Oct 5;8(10):790. doi: 10.3390/nano8100790.

DOI:10.3390/nano8100790

PMID:30301148

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6215229/

Abstract

We present NiO/Ni composite particles with face-centered cubic (fcc) structure prepared by a pulsed laser irradiation of NiO nanoparticles dispersed in liquid. The sizes of particles and the Ni content in NiO/Ni composites were controlled by tuning the laser parameters, such as laser fluence and irradiation time. We found that the weight fraction of Ni has a significant impact on magnetic properties of composite particles. Large exchange bias (H) and coercivity field (H) were observed at 5 K due to the creation of heterojunctions at interfaces of ferromagnetic Ni and antiferromagnetic NiO. For the NiO/Ni composites with 80% of NiO we have observed the largest values of exchange bias (175 Oe) and coercive field (950 Oe), but the increase of Ni weight fraction resulted in the decrease of both H and H values.

摘要

我们展示了通过对分散在液体中的NiO纳米颗粒进行脉冲激光辐照制备的具有面心立方（fcc）结构的NiO/Ni复合颗粒。通过调整激光参数，如激光能量密度和辐照时间，可以控制NiO/Ni复合材料中颗粒的尺寸和Ni含量。我们发现Ni的重量分数对复合颗粒的磁性有显著影响。由于在铁磁Ni和反铁磁NiO的界面处形成了异质结，在5 K时观察到了较大的交换偏置（H）和矫顽场（H）。对于含有80% NiO的NiO/Ni复合材料，我们观察到了交换偏置（175 Oe）和矫顽场（950 Oe）的最大值，但Ni重量分数的增加导致H和H值均降低。