Guo Shanshan, Henschel Mara, Wolf Daniel, Pohl Darius, Lubk Axel, Blon Thomas, Neu Volker, Leistner Karin
Leibniz IFW Dresden, 01069 Dresden, Germany.
Dresden Center for Nanoanalysis, Center for Advancing Electronics Dresden, TU Dresden, 01069 Dresden, Germany.
Nano Lett. 2022 May 25;22(10):4006-4012. doi: 10.1021/acs.nanolett.2c00607. Epub 2022 May 9.
As the size of magnetic devices continuously decreases, the creation of three-dimensional nanomagnets and the understanding of their magnetic configurations become increasingly important for modern applications. Here, by progressive nucleation during epitaxial nanoelectrodeposition, we synthesize single-crystal iron nanocuboids with sizes ranging 10 to 200 nm on one sample. The size-dependent magnetic configurations of these nanocuboids are studied by quantitative magnetic force microscopy and electron holography. In conjunction, a "magnetic configuration versus size" phase diagram is established via micromagnetic simulations. Both experiment and theory reveal a sequential transition from Landau pattern to vortex and finally single domain when decreasing the sizes of the nanocuboids. The combinatorial-like approach leads to a quantitative understanding of the magnetic configurations of the nanomagnets in a broad size range. It can be transferred to other materials and shapes and thereby presents an advanced route to enrich the material library for future nanodevice design.
随着磁性器件尺寸不断减小，三维纳米磁体的制备及其磁结构的理解对于现代应用变得越来越重要。在此，通过外延纳米电沉积过程中的逐步成核，我们在一个样品上合成了尺寸范围为10至200纳米的单晶铁纳米立方体。通过定量磁力显微镜和电子全息术研究了这些纳米立方体的尺寸依赖性磁结构。同时，通过微磁模拟建立了“磁结构与尺寸”相图。实验和理论均表明，当减小纳米立方体尺寸时，会依次从朗道模式转变为涡旋，最终转变为单畴。这种类似组合的方法使得在很宽的尺寸范围内对纳米磁体的磁结构有了定量的理解。它可以转移到其他材料和形状上，从而为未来纳米器件设计丰富材料库提供了一条先进途径。
