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Exchange bias and training effect in NiCr_2O_4/Cr_2O_3 composite

机译：NiCr_2O_4 / Cr_2O_3复合材料的交换偏向和训练效果

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摘要

NiCr_2O_4/Cr_2O_3 system with ferrimagnetic spinel and antiferromagnetic transition metal oxide has been firstly synthesized by a chemical co-precipitation method. Magnetic measurements on this system also exhibit the exchange bias (EB) and training effect for the first time. EB effect with evident shift of coercive field and remnant magnetization can be detected at low temperature after field cooling from 350 K. The EB field can reach about 2037 Oe and the magnetization shift is as large as 0.129 emu/g at 10 K. Furthermore, EB effect recedes gradually with temperature increasing and disappears at about 70 K. In this process, EB field decreases with a linear dependence on the magnetization shift. This EB behavior is discussed according to the disordered regions existed at the interface between NiCr_2O_4 and Cr_2O_3. In addition, we have analyzed the training effect, which indicates the coexistence of two distinct forms of training mechanism during cycle procedure. One is concerned with an athermal impact resulting in the abrupt single cycle training and the other is gradual reduction of EB field during the subsequent cycles due to the conventional thermal activation mechanism.
机译：首先通过化学共沉淀法合成了具有亚铁尖晶石和反铁磁过渡金属氧化物的NiCr_2O_4 / Cr_2O_3体系。在该系统上的磁测量结果也首次显示出交换偏差（EB）和训练效果。从350 K磁场冷却后，可以在低温下检测到EB效应，该磁场具有明显的矫顽场偏移和剩余磁化强度。EB场可以达到约2037 Oe，并且在10 K时磁化偏移高达0.129 emu / g。 EB效应随着温度的升高而逐渐减小，并在约70 K时消失。在此过程中，EB场的减小与磁化位移的线性相关。根据存在于NiCr_2O_4和Cr_2O_3之间的无序区域讨论了这种EB行为。此外，我们已经分析了训练效果，这表明在循环过程中两种不同形式的训练机制并存。一个是与非热冲击有关，该冲击导致突然的单周期训练，另一个是由于常规的热激活机制，在随后的周期中逐渐减小了EB场。

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  • 来源
    《Journal of Materials Research》 |2015年第21期|3252-3258|共7页
  • 作者

    Wang Liguang; Zhu Changming; Tian Zhaoming; Yuan Songliu;

  • 作者单位

    School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

    School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

    School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

    School of Physics, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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