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arXiv 2202.09536cond-mat.mes-hall
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花生形纳米磁体人工自旋冰系统中简并和磁化翻转的控制

Controlling degeneracy and magnetization switching in an artificial spin ice system of peanut-shaped nanomagnets

Avinash Chaurasiya, Manish Anand, Rajdeep Singh Rawat

摘要:

利用大量的数值模拟,我们探讨了由花生状纳米磁体组成的二维人工自旋冰(ASI)系统中的磁化翻转。我们还研究了外加磁场对系统磁态简并度的影响。开关场被发现是一个订单较小的建议ASI系统与花生形纳米磁体相比,传统上使用的高度各向异性的纳米岛,如椭圆形纳米磁体。亚稳态2-in/2-out(II型)磁状态在剩磁处是稳健的。我们还能够通过仔细改变外部磁场来获得对应于II型磁结构的其他可能的微观状态。这意味着人们可以通过施加适当的磁场来控制磁态的简并度。有趣的是,由于去除纳米磁体引起的缺陷,磁荷中性被打破。在这种情况下,该系统似乎也有1-out/3-in或3-out/1-in(III型)自旋状态,让人想起磁自旋。我们相信,我们的研究是非常可取的背景下,开发下一代自旋电子学为基础的设备,为未来的技术。

英文摘要:

Using extensive numerical simulations, we probe the magnetization switching in two-dimensional artificial spin ice (ASI) system consisting of peanut-shaped nanomagnets. We also investigated the effect of the external magnetic field on the degeneracy of the magnetic states in such a system. The switching field is found to be one order smaller in the proposed ASI system with peanut-shaped nanomagnets as compared to the conventionally used highly-anisotropic nanoisland such as elliptically shaped nanomagnets. The metastable 2-in/2-out (Type II) magnetic state is robust at the remanence. We are also able to access the other possible microstates corresponding to Type II magnetic configurations by carefully varying the external magnetic field. It implies that one can control the degeneracy of the magnetic state by the application of a suitable magnetic field. Interestingly, the magnetic charge neutrality breaks due to the defects induced by removing nanomagnets. In such a case, the system also appears to have a 1-out/3-in or 3-out/1-in (Type III) spin state, reminiscent of a magnetic monopole. We believe that our study is highly desirable in the context of developing the next-generation spintronics-based devices for future technologies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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