Spin-glasslike behavior of magnetic ordered state originating from strong interparticle magnetostatic interaction in α-Fe nanoparticle agglomerate
Spin-glasslike behavior of magnetic ordered state originating from strong interparticle magnetostatic interaction in α-Fe nanoparticle agglomerate
复制标题
DOI：
10.1063/1.3602313
复制
发表时间：
2011-06-20
影响因子：
4
通讯作者：
Sato, Tetsuya
中科院分区：
文献类型：
--
作者：
Hiroi, Kosuke;Kura, Hiroaki;Sato, Tetsuya
在通过偶极耦合的强相互作用的纳米颗粒团聚体中，使用化学合成的α-Fe纳米颗粒制备，零场冷却的磁化强度呈现其峰值的温度T（峰值）达到385 K。这表明在室温以上出现磁有序。在T（峰值）以下观察到的老化现象和记忆效应本质上与自旋玻璃相同。在室温附近的自旋玻璃状行为的外观应归因于三维粒子间的耦合，这是纯粹的静磁。(C)2011年美国物理学会。[doi：10.1063/1.3602313]
In strongly interacting nanoparticle agglomerate through dipolar coupling, prepared using chemically synthesized alpha-Fe nanoparticle, the temperature T(peak) at which the zero-field-cooled magnetization exhibits its peak reaches 385 K. This indicates that the magnetic ordering appears above room temperature. Aging phenomena and memory effect observed below T(peak) are intrinsically same as that of spin glasses. The appearance of spin-glasslike behavior near room temperature should be attributed to the three-dimensional interparticle coupling that is purely magnetostatic. (C) 2011 American Institute of Physics. [doi:10.1063/1.3602313]