Magnetically capped rolled-up nanomembranes.
Magnetically capped rolled-up nanomembranes.
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DOI：
10.1021/nl301147h
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发表时间：
2012-07
期刊：
影响因子：
10.8
通讯作者：
R. Streubel;D. Thurmer;D. Makarov;F. Kronast;T. Kosub;V. Kravchuk;D. Sheka;Y. Gaididei;R. Schäfer;O. Schmidt
中科院分区：
文献类型：
--
作者：
R. Streubel;D. Thurmer;D. Makarov;F. Kronast;T. Kosub;V. Kravchuk;D. Sheka;Y. Gaididei;R. Schäfer;O. Schmidt
修改磁性纳米结构的曲率是一种新颖而优雅的方式，可以在纳米尺度上定制物理现象，从而克服平面对应物中明显的局限性。在这里，我们解决曲率驱动的变化，静态磁性能在圆柱形弯曲的磁段具有不同的曲率半径。弯曲的架构是通过用软磁20 nm厚的坡莫合金（Ni（80）Fe（20））膜覆盖纳米级和微米级的卷起的膜来制备的。定量比较了不同直径帽盖的磁化反转过程。生成了磁平衡磁畴图案（直径与长度）的相图。为此，联合实验，包括X射线磁圆二色性光电子发射显微镜（XMCD-PEEM），和理论研究进行。圆柱形弯曲结构中源于厚度梯度的各向异性静磁相互作用基本上减少了紧密堆积的弯曲纳米线之间的静磁相互作用。该特征对于跑道存储器器件是有益的，因为可以实现比平面对应物可能实现的高得多的面密度。
Modifying the curvature in magnetic nanostructures is a novel and elegant way toward tailoring physical phenomena at the nanoscale, allowing one to overcome limitations apparent in planar counterparts. Here, we address curvature-driven changes of static magnetic properties in cylindrically curved magnetic segments with different radii of curvature. The curved architectures are prepared by capping nonmagnetic micrometer- and nanometer-sized rolled-up membranes with a soft-magnetic 20 nm thick permalloy (Ni(80)Fe(20)) film. A quantitative comparison between the magnetization reversal processes in caps with different diameters is given. The phase diagrams of magnetic equilibrium domain patterns (diameter versus length) are generated. For this, joint experimental, including X-ray magnetic circular dichroism photoelectron emission microscopy (XMCD-PEEM), and theoretical studies are carried out. The anisotropic magnetostatic interaction in cylindrically curved architectures originating from the thickness gradient reduces substantially the magnetostatic interaction between closely packed curved nanowires. This feature is beneficial for racetrack memory devices, since a much higher areal density might be achieved than possible with planar counterparts.