按需室温可重写磁性图案化中相变的局部光热控制
Local Photothermal Control of Phase Transitions for On-demand Room-temperature Rewritable Magnetic Patterning
摘要：
在磁背景内制造受控磁结构图案的能力对于几种类型的现有和提议的技术是必不可少的。这种模式提供了磁存储器和逻辑器件的基础，允许人工自旋冰晶格的创建，并使磁振子传播的研究成为可能。在这里，我们报告了一种新的磁性图案化方法，允许重复创建和擦除任意形状的薄膜铁磁结构。这种策略是通过外延Fe $_{0.52}$ Rh $_{0.48}$薄膜设计，使铁磁和反铁磁相在室温下结晶。从薄膜在一个统一的反铁磁状态，我们证明了写入任意图案的铁磁相的局部加热与聚焦激光的能力。如果需要，可以通过用热电冷却器冷却来消除结果，并重复重新图案化材料。
英文摘要：
The ability to make controlled patterns of magnetic structures within a nonmagnetic background is essential for several types of existing and proposed technologies. Such patterns provide the foundation of magnetic memory and logic devices, allow the creation of artificial spin-ice lattices and enable the study of magnon propagation. Here, we report a novel approach for magnetic patterning that allows repeated creation and erasure of arbitrary shapes of thin-film ferromagnetic structures. This strategy is enabled by epitaxial Fe$_{0.52}$Rh$_{0.48}$ thin films designed so that both ferromagnetic and antiferromagnetic phases are bistable at room temperature. Starting with the film in a uniform antiferromagnetic state, we demonstrate the ability to write arbitrary patterns of the ferromagnetic phase by local heating with a focused laser. If desired, the results can then be erased by cooling with a thermoelectric cooler and the material repeatedly re-patterned.
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