人工铁磁准晶体中共存的有序和受挫亚晶格的直接成像。
Direct imaging of coexisting ordered and frustrated sublattices in artificial ferromagnetic quasicrystals.
作者信息
Farmer B, Bhat V S, Balk A, Teipel E, Smith N, Unguris J, Keavney D J, Hastings J T, De Long L E
机构信息
Department of Physics and Astronomy, University of Kentucky, 505 Rose Street, Lexington, Kentucky 40506-0055, USA.
Center for Nanoscale Science and Technology, National Institute of Standards and Technology, 100 Bureau Dr., Gaithersburg, Maryland 20899, USA.
出版信息
Phys Rev B. 2016 Apr;93(13). doi: 10.1103/PhysRevB.93.134428. Epub 2016 Apr 25.
We have used scanning electron microscopy with polarization analysis and photoemission electron microscopy to image the two-dimensional magnetization of permalloy films patterned into Penrose P2 tilings (P2T). The interplay of exchange interactions in asymmetrically coordinated vertices and short-range dipole interactions among connected film segments stabilize magnetically ordered, spatially distinct sublattices that coexist with frustrated sublattices at room temperature. Numerical simulations that include long-range dipole interactions between sublattices agree with images of as-grown P2T samples and predict a magnetically ordered ground state for a two-dimensional quasicrystal lattice of classical Ising spins.
我们使用了带有偏振分析的扫描电子显微镜和光发射电子显微镜，对图案化为彭罗斯P2镶嵌（P2T）的坡莫合金薄膜的二维磁化进行成像。在不对称配位顶点处的交换相互作用与相连薄膜段之间的短程偶极相互作用相互作用，在室温下稳定了磁有序、空间上不同的亚晶格，这些亚晶格与受挫亚晶格共存。包含亚晶格之间长程偶极相互作用的数值模拟与生长态P2T样品的图像一致，并预测了经典伊辛自旋二维准晶格的磁有序基态。
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