论文标题
自旋冰中的磁矩碎片在磁矩碎片
Electric activity at magnetic moment fragmentation in spin ice
论文作者
论文摘要
自旋冰系统表现出各种非常不平凡的特性，最引人注目的是磁性单极的存在。这样的单极状态也可以具有非平凡的电特性：每个单极都存在电偶极子。在碎片化（MF）状态下，遇到了一种新型的情况，其中单翼和抗巨骨被完美地排序，而旋转本身仍然无序。我们表明，这种部分排序强烈修改了此类系统的电活动：通常是随机且动态的电偶极子在（d，-d）对中以MF状态配对，从而大大降低了其电活动。非电流旋转系统中存在的电流也受到MF的强烈影响。我们还考虑在磁纹理（域壁，局部缺陷）中的偶极子和当前模式进行修改，以及在MF状态下具有非平凡动力学的激发，它们表现出非常丰富的行为，并且可以原则上允许通过电场来控制它们。
Spin ice systems display a variety of very nontrivial properties, the most striking being the existence in them of magnetic monopoles. Such monopole states can also have nontrivial electric properties: there exist electric dipoles attached to each monopole. A novel situation is encountered in the moment fragmentation (MF) state, in which monopoles and antimonopoles are perfectly ordered, whereas spins themselves remain disordered. We show that such partial ordering strongly modifies the electric activity of such systems: the electric dipoles, which are usually random and dynamic, become paired in the MF state in (d,-d) pairs, thus strongly reducing their electric activity. The electric currents existing in systems with noncoplanar spins are also strongly influenced by MF. We also consider modifications in dipole and current patterns in magnetic textures (domain walls, local defects) and at excitations with nontrivial dynamics in a MF state, which show very rich behaviour and which could in principle allow to control them by electric field.
