Coexistence of sign reversal of both magnetization and exchange bias field in the core-shell type La0.2Ce0.8CrO3 nanoparticles
Coexistence of sign reversal of both magnetization and exchange bias field in the core-shell type La0.2Ce0.8CrO3 nanoparticles
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DOI：
10.1063/1.3453530
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发表时间：
2010-06
影响因子：
4
通讯作者：
P. Manna;S. Yusuf;R. Shukla;A. Tyagi
中科院分区：
文献类型：
--
作者：
P. Manna;S. Yusuf;R. Shukla;A. Tyagi
我们报告了一个非凡的共存的符号反转的磁化和交换偏置场的La 0.2Ce 0.8CrO3纳米粒子。从高分辨率的透射电子显微镜图像，和场依赖性的热释电和等温磁化强度测量，纳米粒子被发现是核壳性质。由Cr ~（3+）和Ce ~（3+）自旋组成的反铁磁核和由未补偿自旋组成的无序壳构成的核-壳结构解释了磁化强度和交换偏置场的符号反转。本研究提供了一种在单一磁系统中调节磁化强度和交换偏置场符号的极好方法。
We report an extraordinary coexistence of sign reversal of both magnetization and exchange bias field in the La0.2Ce0.8CrO3 nanoparticles. From the high resolution transmission electron microscopy image, and field dependence of thermoremanent and isothermoremanent magnetization measurements, the nanoparticles are found to be of core-shell nature. The core-shell configuration with an antiferromagnetic core of the Cr3+ and Ce3+ spins and a disordered shell with the uncompensated spins, explains the sign reversal of both magnetization and exchange bias field. The present study shows an excellent way of tuning the sign of both magnetization and exchange bias field in a single magnetic system.