Anomalous coercivity enhancement with temperature and tunable exchange bias in Gd and Ti co-doped BiFeO3 multiferroics
Anomalous coercivity enhancement with temperature and tunable exchange bias in Gd and Ti co-doped BiFeO3 multiferroics
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DOI：
10.1088/0022-3727/49/9/095001
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发表时间：
2016-03-09
影响因子：
3.4
通讯作者：
Basith, M. A.
中科院分区：
文献类型：
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作者：
Ahmmad, Bashir;Islam, M. Z.;Basith, M. A.
研究了温度对Bi_（0.9）Gd_（0.1）Fe_（1-x）Ti_xO_3（x = 0.00-0.20）多铁性系统磁性能的影响。出乎意料的是，该多铁性系统的矫顽场（H-c）随着温度的升高而增加。矫顽场和剩磁在样品x = 0.10，即在一个样品的组成Bi0.9Gd0.1Fe0.9Ti0.1O3比那些x = 0.00和0.20的组合物在很宽的温度范围内较高。因此，我们对x = 0.10的样品进行了广泛的温度依赖性磁化实验。在不同温度下的磁滞回线表现出向磁场轴的不对称位移，这表明在该材料系统中存在交换偏置效应。磁滞回线也进行了在150 K和250 K的温度从300 K在各种冷却磁场（H-冷却）的样品冷却下来。交换偏置场（H-EB）值随H-cool而增加，随温度而降低。H-EB值可通过在高达250 K的温度下的场冷却来调节。
We have investigated the effects of temperature on the magnetic properties of the Bi0.9Gd0.1Fe1-xTixO3 (x = 0.00-0.20) multiferroic system. Unexpectedly, the coercive fields (H-c) of this multiferroic system increased with increasing temperature. The coercive fields and remanent magnetization were higher over a wide range of temperatures in sample x = 0.10, i.e. in a sample with a composition Bi0.9Gd0.1Fe0.9Ti0.1O3 than those of x = 0.00 and 0.20 compositions. Therefore, we carried out temperature-dependent magnetization experiments extensively for sample x = 0.10. The magnetic hysteresis loops at different temperatures exhibit an asymmetric shift towards the magnetic field axes, which indicates the presence of an exchange bias effect in this material system. The hysteresis loops were also carried out at temperatures of 150 K and 250 K by cooling down the sample from 300 K in various cooling magnetic fields (H-cool). The exchange bias field (H-EB) values increased with H-cool and decreased with temperature. The H-EB values were tunable by field cooling at temperatures of up to 250 K.