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首页> 外文期刊>Chemistry: A European journal >Exchange-Coupled fct-FePd/alpha-Fe Nanocomposite Magnets Converted from Pd/Fe3O4 Core/Shell Nanoparticles
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Exchange-Coupled fct-FePd/alpha-Fe Nanocomposite Magnets Converted from Pd/Fe3O4 Core/Shell Nanoparticles

机译：由Pd / Fe3O4核/壳纳米粒子转化而来的交换耦合的fct-FePd /α-Fe纳米复合磁体

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摘要

We report the controlled synthesis of exchange-coupled face-centered tetragonal (fct) FePd/-Fe nanocomposite magnets with variable Fe concentration. The composite was converted from Pd/Fe3O4 core/shell nanoparticles through a high-temperature annealing process in a reducing atmosphere. The shell thickness of core/shell Pd/Fe3O4 nanoparticles could be readily tuned, and subsequently the concentration of Fe in nanocomposite magnets was controlled. Upon annealing reduction, the hard magnetic fct-FePd phase was formed by the interdiffusion between reduced -Fe and face-centered cubic (fcc) Pd, whereas the excessive -Fe remained around the fct-FePd grains, realizing exchange coupling between the soft magnetic -Fe and hard magnetic fct-FePd phases. Magnetic measurements showed variation in the magnetic properties of the nanocomposite magnets with different compositions, indicating distinct exchange coupling at the interfaces. The coercivity of the exchange-coupled nanocomposites could be tuned from 0.7 to 2.8kOe and the saturation magnetization could be controlled from 93 to 160emug(-1). This work provides a bottom-up approach using exchange-coupled nanocomposites for engineering advanced permanent magnets with controllable magnetic properties.
机译：我们报告了具有可变铁浓度的交换耦合面心四方（fct）FePd / -Fe纳米复合磁体的受控合成。通过还原性气氛中的高温退火工艺将复合材料从Pd / Fe3O4核/壳纳米颗粒中转化出来。核/壳Pd / Fe3O4纳米颗粒的壳厚度可以很容易地调节，随后可以控制纳米复合磁体中Fe的浓度。经过退火还原后，还原的-Fe与面心立方（fcc）Pd之间的相互扩散形成了硬磁fct-FePd相，而过量的-Fe残留在fct-FePd晶粒周围，实现了软磁之间的交换耦合。 -Fe和硬磁fct-FePd相。磁性测量显示具有不同组成的纳米复合磁体的磁性的变化，表明在界面处的明显的交换耦合。交换耦合纳米复合材料的矫顽力可以从0.7调整到2.8kOe，饱​​和磁化强度可以控制在93到160emug（-1）之间。这项工作提供了一种自下而上的方法，该方法使用交换耦合纳米复合材料来设计具有可控磁性的高级永磁体。

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