Dynamic and fluctuation properties of a graphene disk levitated by a diamagnetic force in air
Dynamic and fluctuation properties of a graphene disk levitated by a diamagnetic force in air
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DOI：
10.1088/1361-6463/ac683c
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发表时间：
2022-04
期刊：
影响因子：
--
通讯作者：
N. Inui;Kazunori Maebuchi
中科院分区：
文献类型：
--
作者：
N. Inui;Kazunori Maebuchi
如果磁场及其梯度的乘积足够大，石墨烯圆盘可以通过它们的反磁相互作用产生的排斥力悬浮在磁铁上方。由于石墨烯的磁导率具有很强的各向异性，反磁力也会引起石墨烯圆盘的旋转；因此，通过求解朗之万方程来考虑质心和旋转的运动。此外，还解释了悬浮石墨烯盘的位置和角度波动对尺寸和温度的依赖关系。
A graphene disk can be levitated above a magnet by a repulsive force arising from their diamagnetic interaction if the product of the magnetic field and its gradient is sufficiently large. The diamagnetic force also causes the rotation of the graphene disk because of the strong anisotropy of the magnetic permeability of graphene; thus a motion of centroid and rotation are considered by solving simultaneous Langevin equations. Furthermore, the dependence of a fluctuations of the position and angle of the levitated graphene disk on the size and temperature is also explained.