在自组装FeRh纳米磁体中保持变磁性
Preserving Metamagnetism in Self-Assembled FeRh Nanomagnets
AI总结：
本文提出通过固态去润湿自组装FeRh纳米磁体，证明该方法可保持变磁性，并揭示晶面构型、空间限域对相变行为的影响。
摘要：
我们提出了利用溅射沉积工艺制备变磁性FeRh纳米岛阵列的自组装路线。控制生长参数和外延关系可以调节FeRh纳米岛的尺寸和形状。虽然通过热力学成核在氧化物衬底上形成的纳米岛中，反铁磁与铁磁有序之间的相变在很大程度上被抑制，但我们发现，通过固态去润湿形成的纳米磁体阵列在很大程度上保持了变磁性。这种行为强烈依赖于纳米岛所形成晶面的特征，而晶面特征因每种自组装路线而异。比较纳米岛各磁性相的计算表面能表明，特定晶面的几何构型可以抑制或允许变磁性。此外，我们发现空间限域导致非常显著的过冷现象以及纳米岛中相分离的缺失。最后，将负载型纳米磁体从衬底上化学刻蚀下来，以研究自支撑纳米颗粒的相变特性。我们证明，固态去润湿是一种可行且可扩展的方法，可用于获得保持变磁性的负载型和自支撑FeRh纳米磁体。
英文摘要：
We present self-assembly routes of metamagnetic FeRh nanoisland arrays using sputter deposition processing. Controlling the growth parameters and epitaxy allows tuning the size and shape of the FeRh nanoislands. While the phase transition between antiferromagnetic and ferromagnetic order is largely suppressed in nanoislands formed on oxide substrates via thermodynamic nucleation, we find that metamagnetism is largely preserved in nanomagnet arrays formed through solid-state dewetting. This behavior is strongly dependent on the resulting crystal faceting of the nanoislands, which is characteristic of each assembly route. Comparing the calculated surface energies for each magnetic phase of the nanoislands reveals that metamagnetism can be suppressed or allowed by specific geometrical configurations of the facets. Furthermore, we find that the spatial confinement leads to very pronounced supercooling and the absence of phase separation in the nanoislands. Finally, the supported nanomagnets are chemically etched away from the substrates to inspect the phase transition properties of self-standing nanoparticles. We demonstrate that solid-state dewetting is a feasible and scalable way to obtain supported and free-standing FeRh nanomagnets with preserved metamagnetism.
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