...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physical review. B, Condensed Matter And Materals Physics >Toroidal quantum states in molecular spin-frustrated triangular nanomagnets with weak spin-orbit coupling: Applications to molecular spintronics
【24h】

Toroidal quantum states in molecular spin-frustrated triangular nanomagnets with weak spin-orbit coupling: Applications to molecular spintronics

机译：自旋轨道耦合弱的分子自旋受阻的三角形纳米磁体中的环形量子态：在分子自旋电子学中的应用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We theoretically investigate the ground-state spin texture and spin transport properties of triangular rings with on-site spins S_1 = 1/2 (q = 1-3). In the limit of strong antiferromagnetic exchange coupling and weak spin-orbit coupling, we find it is possible to prepare a noncollinear degenerate ground state with a zero magnetic moment and a nonzero toroidal moment τ = gμ_B ∑_q r_q × S_q, aligned along the (C_3-symmetry axis. These pure toroidal states can be prepared: (ⅰ) within the fourfold degenerate spin-frustrated ground state even without any spin-orbit coupling: (ⅱ) within the ground Kramers doublet resulting from weak spin-orbit splitting of the fourfold degenerate frustrated manifold via Dzyaloshinskii-Moriya anti ferromagnetic exchange coupling. We also investigate the relationship between toroidal states and chiral spin states, characterized by the eigenvalues of the scalar spin chirality operator χ = 4/(3~(1/2))S_1·S_2 × S_3, and tind that, since [τ, χ] ≠ 0, it is not possible to prepare states that are both toroidal and chiral simultaneously. Finally, by setting up a quantum transport model in the Coulomb blockade regime, we find that a spin current injected through a spin-polarized source electrode into the triangle is partially reversed upon scattering with the molecular toroidal states. This spin-switching effect is. in fact, a signature of molecular spin-transfer torque, which can be harnessed to modify the nonequilibrium populations of the +τ- and -τ-toroidal states, thus, to induce a net toroidal magnetization in the device using a spin current.
机译：我们理论上研究了具有自旋S_1 = 1/2（q = 1-3）的三角形环的基态自旋织构和自旋输运性质。在强反铁磁交换耦合和弱自旋轨道耦合的极限下，我们发现有可能准备一个具有零磁矩和非零环形矩的非共线简并基态τ=gμ_B∑_q r_q×S_q沿着（ C_3对称轴，可以准备这些纯环形状态：（ⅰ）在四倍简并的自旋受挫基态中，即使没有任何自旋轨道耦合：（ⅱ）在地面Kramers双重峰中，由于弱的自旋轨道分裂通过Dzyaloshinskii-Moriya反铁磁交换耦合产生的四倍简并挫折流形，我们还研究了环形态与手性自旋态之间的关系，其特征为标量自旋手性性算符特征值χ= 4 /（3〜（1/2））S_1 ·S_2×S_3，并指出由于[τ，χ]≠0，因此不可能同时制备环型和手性态，最后，通过在库仑封锁区建立量子输运模型ime，我们发现通过自旋极化的源电极注入三角形的自旋电流在以分子环形态散射时会部分反转。这种自旋切换效果是。实际上，分子自旋传递转矩的特征可被用来修饰+τ和-τ环态的非平衡态，从而利用自旋电流在设备中感应出净的环形磁化强度。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号