Strong room temperature spontaneous exchange bias in BiFeO3-CoFe2O4 nanocomposites
Strong room temperature spontaneous exchange bias in BiFeO3-CoFe2O4 nanocomposites
复制标题
BiFeO3-CoFe2O4 纳米复合材料中的强室温自发交换偏压
DOI：
10.1016/j.jallcom.2018.05.125
复制
发表时间：
2018-09-25
影响因子：
6.2
通讯作者：
Liu, Jiping
中科院分区：
文献类型：
--
作者：
Huang, Yue;Li, Song;Liu, Jiping
用水热法合成了BiFeO_3-CoFe_2O_4纳米复合材料，在无场冷的非磁化状态下的测量中观察到了巨大的自发交换偏置(3000E)。与He有关的测量场是单调增加的，交换偏置效应随着测量场扫描范围的增大而减小。而且，随着CoFe2O4比例的增加，交换偏置效应先增大到最大，然后减小。这一效应表明，在BiFeO_3-CoFe(2)O(4)纳米复合材料中，由于亚铁磁性相和反铁磁性相之间的界面耦合，在初始磁化过程中，磁性的单向各向异性可以等温(室温)地设定。提出了一个可能的模型来合理解释我们实验结果背后的机制。(C)2018爱思唯尔B.V.保留所有权利。
BiFeO3-CoFe2O4 nanocomposites were synthesized by hydrothermal method and an enormous spontaneous exchange bias (3000e) observed during the measurement of our samples in an unmagnetized state without field cooling. The measuring field dependent He is monotonic increase, the exchange bias effect decreases as the sweeping range of the measuring field increases. Moreover as the CoFe2O4 proportion increases, the exchange bias effect first increases to the maximum and then decreases. This effect suggests that the magnetic unidirectional anisotropy can be set isothermally (room temperature) during the initial magnetization process due to the interface coupling between ferrimagnetic and antiferromagnetic phases in BiFeO3-CoFe(2)O(4 )nanocomposites. A possible model proposed to explain the mechanism underlying our experimental results reasonably. (C) 2018 Elsevier B.V. All rights reserved.