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首页> 外文期刊>Physical review >Quasidegenerate ice manifold in a purely two-dimensional square array of nanomagnets
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Quasidegenerate ice manifold in a purely two-dimensional square array of nanomagnets

机译：QuasideGege冰歧管在纯粹的二维方形阵列的纳米磁珠阵列中

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摘要

We investigate numerically the low-energy properties of an artificial square spin system in which the nanomagnets are physically connected at the lattice vertex sites. Micromagnetic simulations performed on a single square vertex reveal that type-II vertices always have the lowest energy, in sharp contrast with what is found in lattices made of disconnected nanomagnets, for which type-I vertices are the ground-state configuration. The micromagnetic simulations also show that the energy stored at the vertex sites strongly depends on the type of magnetic domain wall formed by the four connected nanomagnets. Interestingly, the energy gap between type-I and type-II vertices can be drastically reduced by varying the geometrical parameters of the nanomagnets, such as their width and thickness. For typical widths and thicknesses achievable experimentally, we find that this energy gap is small enough to consider type-I and type-II vertices as quasidegenerate. Based on the vertex energies provided by the micromagnetic simulations, we compute the thermodynamic properties of the corresponding spin model using Monte Carlo simulations. In some cases, these properties are hardly distinguishable from those of the celebrated square ice model. Our findings then suggest that an ice physics, characterized by a massively degenerate ground-state manifold at low temperature, may be observed experimentally in a simple square lattice of connected magnetic elements. This work thus provides a route to fabricate artificial algebraic spin liquids using a purely two-dimensional geometry.
机译：我们研究了数量的人工旋转系统的低能量特性，其中纳米磁头在晶格顶点位点物理连接​​。在单个方形顶点上执行的微磁模拟显示，II型顶点始终具有最低能量，与断开的纳米磁磁带的晶格中发现的鲜明对比度鲜明对比，其中I型顶点是地态配置。微磁性模拟还表明，存储在顶点部位的能量强烈地取决于由四个连接的纳米磁镜形成的磁畴壁的类型。有趣的是，通过改变纳米磁镜的几何参数，例如它们的宽度和厚度，可以大大降低I型-I和型号顶点之间的能隙。对于实验可实现的典型宽度和厚度，我们发现这种能隙足够小，以考虑类型-I和II型顶点作为Quasidegere。基于微磁仿真提供的顶点能量，我们使用蒙特卡罗模拟计算相应的旋转模型的热力学特性。在某些情况下，这些性质与庆祝的方形冰型模型几乎没有区别。然后，我们的研究结果表明，在低温下以低温在低温下表征的冰质物理学可以在连接的磁性元件的简单方形晶格中实验观察到低温。因此，该工作提供了使用纯二维几何形状制造人工代数旋转液体的途径。

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  • 来源
    《Physical review》 |2019年第22期|224434.1-224434.8|共8页
  • 作者

    Perrin Yann; Canals Benjamin; Rougemaille Nicolas;

  • 作者单位

    Univ Grenoble Alpes CNRS Grenoble INP Inst NEEL F-38000 Grenoble France;

    Univ Grenoble Alpes CNRS Grenoble INP Inst NEEL F-38000 Grenoble France;

    Univ Grenoble Alpes CNRS Grenoble INP Inst NEEL F-38000 Grenoble France;

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