Field-induced percolation transition and 100% low-field magnetoresistance in aligned half-metallic nanoparticle arrays
Field-induced percolation transition and 100% low-field magnetoresistance in aligned half-metallic nanoparticle arrays
复制标题
DOI：
10.1063/1.2202103
复制
发表时间：
2006-05
影响因子：
4
通讯作者：
Tian-Yi Cai;S. Ju;Zhen-ya Li
中科院分区：
文献类型：
--
作者：
Tian-Yi Cai;S. Ju;Zhen-ya Li
采用蒙特卡罗方法模拟了半金属纳米颗粒阵列中磁化反转与磁输运的关系。研究发现，当纳米颗粒的磁各向异性轴沿沿着同一方向排列时，低场磁电阻的绝对值和开关效应都得到了显著增强.与传统的颗粒状铁磁体相比，渗流机制被发现占主导地位，导致100%的低场磁电阻在二维半金属纳米颗粒阵列。这些结果也给出了更深入的了解实验结果，优化的磁阻效应被发现在CrO2复合材料与场取向CrO2颗粒。
A Monte Carlo simulation is performed to study the relationship between magnetization reversal and magnetotransport in half-metallic nanoparticle arrays. It is found that both the absolute magnitude of low-field magnetoresistance and the switching effect are significantly enhanced when the magnetic anisotropic axes of nanoparticles are aligned along the same direction. Compared with conventional granular ferromagnets, a percolation mechanism is found to dominate, leading to a 100% low-field magnetoresistance in two-dimensional half-metallic nanoparticle arrays. These results also give a deeper insight into the experimental findings, where optimized magnetoresistive effects are found in CrO2 composites with field-aligned CrO2 particles.