论文标题
通过磁离子二聚化实现高温铁磁
Achieving high-temperature ferromagnetism by means of magnetic ions dimerization
论文作者
论文摘要
磁性二维材料在下一代电子设备中具有潜在的应用，并激发了人们对冷凝物质物理和材料领域的广泛兴趣。但是，如何在二维材料中实现高温铁磁学仍然是物理学的巨大挑战。 在本文中，我们提出了一种有效的方法，即二维材料中磁离子的二聚化可以增强交换耦合并稳定亚铁磁性。 以平面单层结构为例，将两个Mn原子聚集在一起以形成Mn原子的铁磁二聚体，并将这些二聚体组合在一起以将整体ferromagnetismiss构成两种二 - 二 - 二 - 二 - 二 - 二 - 二 - 二二二 - 二二二 - 二二二二维材料。 在Mn $ _2 $ n $ _6 $ c $ _6 $单层中，通过使用Monte Carlo Simulations方法求解Heisenberg模型，确定了272.3 K的近室温铁磁性。
Magnetic two-dimensional materials have potential application in next-generation electronic devices and have stimulated extensive interest in condensed matter physics and material fields. However, how to realize high-temperature ferromagnetism in two-dimensional materials remains a great challenge in physics. Herein, we propose an effective approach that the dimerization of magnetic ions in two-dimensional materials can enhance the exchange coupling and stabilize the ferromagnetism. Manganese carbonitride Mn$_2$N$_6$C$_6$ with a planar monolayer structure is taken as an example to clarify the method, in which two Mn atoms are gathered together to form a ferromagnetic dimer of Mn atoms and further these dimers are coupled together to form the overall ferromagnetism of the two-dimensional material. In Mn$_2$N$_6$C$_6$ monolayer, the near-room-temperature ferromagnetism with the Curie temperature of 272.3 K is determined by solving Heisenberg model using Monte Carlo simulations method.
