铁磁性
材料科学
反铁磁性
退火(玻璃)
纳米棒
凝聚态物理
磁化
自旋电子学
磁场
纳米技术
铁磁性
冶金
物理
量子力学
作者
Supun B. Attanayake,Amit Chanda,Raja Das,Manh‐Huong Phan,H. Srikanth
出处
期刊:AIP Advances
[American Institute of Physics]
日期:2023-02-01
卷期号:13 (2)
被引量:3
摘要
We report on the effects of annealing temperatures ranging from 225 °C to 325 °C on the magnetic properties of high aspect ratio iron oxide nanorods consisting of a ferrimagnetic Fe3O4 phase and an antiferromagnetic α-Fe2O3 phase in an as-prepared state. Annealing at the aforementioned temperatures under a constant flow of O2 for 3 h leads to an increment of the volume fraction of the antiferromagnetic α-Fe2O3 phase and concomitant enhancement of the crystallinity of the ferrimagnetic Fe3O4 phase. These opposing effects compete with each other, resulting in a decrease in global magnetization with increasing the annealing temperature. The desirable magnetic properties are achieved for the sample annealed at 250 °C. For all samples investigated, we observed an increase in low field magnetization at low temperatures after the sample is field cooled in the presence of a 1T magnetic field, which we attribute to the ordering of macro-spins of the weakly ordered antiferromagnetic α-Fe2O3 phase in the presence of the cooling field. Our study will pave the way for determining the optimal conditions to enhance the magnetic characteristics in iron oxide nanorods, which will enable its use in spintronics and biomedical applications.
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