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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Suppression of charge order and exchange bias effect in Nd0.5Ca0.5MnO3 nanocrystalline
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Suppression of charge order and exchange bias effect in Nd0.5Ca0.5MnO3 nanocrystalline

机译:Nd0.5Ca0.5MnO3纳米晶中电荷序的抑制和交换偏压效应

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摘要

An Nd0.5Ca0.5MnO3 (NCMO) sample (average diameter similar to 45 nm) is synthesized by the sol-gel method. The temperature dependence of magnetization indicates that the charge order state is suppressed and a ferromagnetic (FM) transition occurs at similar to 100 K. In addition, the magnetic hysteresis loop at 10K under a cooling field of 10 kOe shifts to both the horizontal and the vertical directions when the measure field is 10 kOe. With an increase in the measure field, both the horizontal and the vertical shifts decrease. When the measure field is 50 kOe, the vertical shift vanishes but the horizontal shift still exists. The observed exchange bias effect is attributed to the exchange coupling between the antiferromagnetic core and the FM shell which embodies spin glass-like surface layers.
机译:通过溶胶-凝胶法合成了Nd0.5Ca0.5MnO3(NCMO)样品(平均直径类似于45 nm)。磁化强度的温度依赖性表明,电荷序状态受到抑制,并且铁磁(FM)跃迁的发生频率接近100K。此外,在10 kOe的冷却磁场下10 K处的磁滞回线向水平方向和垂直方向移动。测量场为10 kOe时的垂直方向。随着测量场的增加,水平和垂直偏移都减小。当测量场为50 kOe时,垂直位移消失,但水平位移仍然存在。观察到的交换偏压效应归因于反铁磁芯和FM壳之间的交换耦合,体现了旋转玻璃状表面层。

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