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Prediction of reentering and switching ferromagnet/antiferromagnet exchange bias by antiferromagnetic proximity effect

机译：防铁磁性接近效应预测再分式和切换铁磁体/反霉菌交换偏压

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摘要

Exchange bias (EB) in ferromagnet/antiferromagnet (FM/AF) core/shell nanoparticles can be used to beat the superparamagnetic limit, and these core/shell nanoparticles are commonly fabricated by the ferromagnetic cores that are naturally oxidized to form an antiferromagnetic shell. The drawbacks of this method are that the EB effect is weak and hard to be controlled due to the shell passivation effect. Thus a theoretical work is conceived where the FM/AF core/shell nanoparticles are embedded into an antiferromagnetic matrix, and an antiferromagnetic proximity effect is induced to modulate the FM/AF EB effect in a controlled way. The results show that the shell/matrix proximity may enhance the magnetic stabilization of nanoparticles to generate the core/shell EB if the matrix is a hard AF. On the other hand, a rigid core/shell EB can switch its sign through thermal training by using a softly antiferromagnetic matrix. The local magnetization behaviors and energy barrier variations during magnetizing well interpreted the simulation results. It is evidenced that the proximity effect can optimize the magnetic properties of the pinning antiferromagnetic layer at will, ranging from statically magnetic stability to dynamically magnetic relaxation. This work opens fascinating possibilities for engineering of magnetic materials with desired magnetic properties, which has led to a surge in both experimental and theoretical investigations.
机译：铁磁磁性/反铁物质（FM / AF）核/壳纳米颗粒的交换偏压（EB）可用于击败超顺磁性极限，并且这些芯/壳纳米颗粒通常由天然氧化以形成反铁磁壳的铁磁核心制造。这种方法的缺点是由于壳钝化效应，EB效应是弱且难以控制的。因此，将FM / AF核/壳纳米颗粒嵌入反铁磁基质中的情况下，诱导诱导反铁磁性接近效应以以受控方式调节FM / AF EB效果的理论上的作用。结果表明，如果基质是硬机构，则壳/基质接近可能增强纳米颗粒的磁稳定，以产生核心/壳EB。另一方面，刚性芯/壳EB可以通过使用轻柔的反铁磁矩阵通过热训练切换其标志。磁化井井井井中的局部磁化行为和能量阻隔变化解释了模拟结果。证明接近效果可以在静脉磁稳定性范围内优化钉扎反铁磁层的磁性，从静态磁稳定性动态磁弛豫。这项工作开辟了具有所需磁性性能的磁性材料工程的迷人可能性，这导致了实验和理论研究中的浪涌。

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