Low-temperature magnetic properties of horse spleen ferritin
会议名称：《中国科学院地质与地球物理研究所第十届(2010年度)学术年会》
会议日期：2011年
学科分类：07[理学] 0809[工学-电子科学与技术（可授工学、理学学位）] 070205[理学-凝聚态物理] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0702[理学-物理学]
基 金：supported by the National Natural Science Foundation of China (40821091 and 40904017) the CAS/SAFEA International Partnership Program for Creative Research Teams(KZCXZ-YW-T10)
关 键 词：horse spleen ferritin superparamagnetic low temperature magnetic properties pre-exponential frequency factor
摘 要：The magnetic properties of the antiferromagnetic cores in ferritin are of importance in the construction and improvement of ferritin -based magnetic resonance imaging systems and their application to environmental *** this study,we carry out integrated magnetic and transmission electron microscopy analyses of horse spleen ferritin(HoSF)to understand the relationships between the magnetic behavior of HoSF and temperature,applied field and grain-size *** R-value from the Woh1-farth -Cisowski test for the investigated sample at 5 K was 0.46,indicating very weak magnetostatic interactions among the nanoparticles of *** nanoparticles of HoSF show superparamagnetic properties at room temperature,while below the blocking temperature of T≈12 K it has a net magnetic moment that comes from the uncompensated spins of the nanoparticle surface or *** thermal relaxation process of HoSF follows the Neel-Arrhenius *** low-temperature AC susceptibility data,we calculated the effective magnetic anisotropy energy E=(5.52±0.16)×l0J;the effective magnetic anisotropy energy constant K=(4.65±0.14)×l0 J/m and the pre-exponential frequency factor f=(4.52±2.93)×*** values are useful in understanding the magnetic behavior of the antiferromagnetic nanoparticles and their potential application in biomedical technology.