Creation of Magnetic Skyrmion Bubble Lattices by Ultrafast Laser in Ultrathin Films,Nano Letters

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Creation of Magnetic Skyrmion Bubble Lattices by Ultrafast Laser in Ultrathin Films
Nano Letters ( IF 9.6 ) Pub Date : 2018-10-08 00:00:00 , DOI: 10.1021/acs.nanolett.8b03653
Soong-Geun Je _{1,

2} , Pierre Vallobra ₂ , Titiksha Srivastava ₁ , Juan-Carlos Rojas-Sánchez ₂ , Thai Ha Pham ₂ , Michel Hehn ₂ , Gregory Malinowski ₂ , Claire Baraduc ₁ , Stéphane Auffret ₁ , Gilles Gaudin ₁ , Stéphane Mangin ₂ , Hélène Béa ₁ , Olivier Boulle ₁

Affiliation

Magnetic skyrmions are topologically nontrivial spin textures which hold great promise as stable information carriers in spintronic devices at the nanoscale. One of the major challenges for developing novel skyrmion-based memory and logic devices is fast and controlled creation of magnetic skyrmions at ambient conditions. Here we demonstrate controlled generation of skyrmion bubbles and skyrmion bubble lattices from a ferromagnetic state in sputtered ultrathin magnetic films at room temperature by a single ultrafast (35 fs) laser pulse. The skyrmion bubble density increases with the laser fluence, and it finally becomes saturated, forming disordered hexagonal lattices. Moreover, we present that the skyrmion bubble lattice configuration leads to enhanced topological stability as compared to isolated skyrmions, suggesting its promising use in data storage. Our findings shed light on the optical approach to the skyrmion bubble lattice in commonly accessible materials, paving the road toward the emerging skyrmion-based memory and synaptic devices.

中文翻译：

超快激光在超薄膜中创建磁性Skyrmion气泡晶格

磁性天生离子是拓扑上不重要的自旋纹理，在纳米级自旋电子设备中作为稳定的信息载体具有广阔的前景。开发新颖的基于Skyrmion的存储器和逻辑设备的主要挑战之一是在环境条件下快速且受控地创建磁性Skyrmion。在这里，我们演示了通过单个超快（35 fs）激光脉冲在室温下溅射的超薄磁性膜中铁磁状态可控地产生的Skyrmion气泡和Skyrmion气泡晶格。天体离子气泡密度随激光通量的增加而增加，最终变为饱和，形成无序的六边形格子。此外，我们提出，与孤立的Skyrmion相比，Skyrmion气泡晶格配置可提高拓扑稳定性，暗示其在数据存储中的应用前景广阔。我们的发现揭示了通常可使用的材料对披天香泡沫格的光学方法，为通往新兴的披天香记忆和突触设备铺平了道路。

更新日期：2018-10-08

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