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Saturation Magnetization and Law of Approach to Saturation for Self-formed Ionic Ferrofluids Based on MnFe2O2 Nanoparticles
Yue-qiang Lin,Jian Li*,Xiao-dong Liu,Ting-zhen Zhang,Bang-cai Wen,Qing-mei Zhang,Hua Miao
Author NameAffiliationE-mail
Yue-qiang Lin School of Physical Science & Technology, Ministry of Education Key Laboratory on Luminescence and Real-Time Analysis, Southwest University, Chongqing 400715, China  
Jian Li* School of Physical Science & Technology, Ministry of Education Key Laboratory on Luminescence and Real-Time Analysis, Southwest University, Chongqing 400715, China aizhong@swu.edu.cn 
Xiao-dong Liu School of Physical Science & Technology, Ministry of Education Key Laboratory on Luminescence and Real-Time Analysis, Southwest University, Chongqing 400715, China  
Ting-zhen Zhang School of Physical Science & Technology, Ministry of Education Key Laboratory on Luminescence and Real-Time Analysis, Southwest University, Chongqing 400715, China  
Bang-cai Wen School of Physical Science & Technology, Ministry of Education Key Laboratory on Luminescence and Real-Time Analysis, Southwest University, Chongqing 400715, China  
Qing-mei Zhang School of Physical Science & Technology, Ministry of Education Key Laboratory on Luminescence and Real-Time Analysis, Southwest University, Chongqing 400715, China  
Hua Miao School of Physical Science & Technology, Ministry of Education Key Laboratory on Luminescence and Real-Time Analysis, Southwest University, Chongqing 400715, China  
Abstract:
The magnetization curves of MnFe2O2 nanoparticles and self-formed ferrofluids based on these particles have been measured at room temperature. The median size of the particles is 13.67 nm. The specific saturation magnetization is less than the theoretical value for the ferrofluids. In the high field range from 5 kOe to 10 kOe, the higher the particle volume fraction is, the steeper the slope of the magnetization curves is when it approaches saturation.The behavior of the saturation magnetization and the law of approach to saturation are due to the presence of self-assembled aggregates of ring-like micelle structures which form in the absence of the magnetic field and field-induced aggregates, respectively. The field-induced aggregates have a dissipative structure, so that at high field, the law of approach to saturation magnetization is different from the one described using Langevin paramagnetism theory. The large particles in the ferrofluids result in apparent hysteresis.
Key words:  Nanoparticle, Ferrofluid, Magnetic property, Aggregate
FundProject:
Saturation Magnetization and Law of Approach to Saturation for Self-formed Ionic Ferrofluids Based on MnFe2O2 Nanoparticles
林跃强,李建*,刘晓东,张廷珍,文榜才,张清梅,苗华
摘要:
测量了MnFe2O4纳米微粒及其磁性液体在室温下的磁化曲线.微粒的中值粒径为13.67 nm. 磁性液体的比饱和磁化强度小于理论值.在高场范围(5~10 kOe)下,磁性液体趋于饱和时,其体积分数越大,磁化曲线的斜率越大. 这种饱和磁化强度性质和趋饱和律分别源自于无场时的环状自组装团聚体和场致团聚体. 场致团聚体是耗散结构,以致于其趋饱和磁化律不同于顺磁理论所描述的趋饱和律. 磁性液体中的大微粒导致了表观磁滞现象.
关键词:  纳米微粒,磁性液体,磁性,团聚体
DOI:10.1088/1674-0068/23/03/325-330
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