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Abstract
Spintronics has been evolving rapidly; it becomes next-generation electronics exploiting both spin and charge degrees of freedom and a primary research field directly linked to topology and nano-magnetism in solid-state physics. In this article, we put our focus on the domain structure and domain wall dynamics based on a cluster magnetic octupole in topological antiferromagnets. Many issues are still not clear in terms of magnetic octupole domains (MODs) and domain walls. We first discuss the current status of the study on the antiferromagnetic domains and walls and then the MODs and walls from detection and manipulation viewpoints.
Highlights
Effective methods to manipulate the magnetic structures and dynamics of magnetic domains and domain walls have been developed
We put our focus on the domain structure and domain wall dynamics based on a cluster magnetic octupole in topological antiferromagnets
Antiferromagnets (AFMs) are attractive because of expectations for higher performance of magnetic devices as shown in Table I. (1) The antiferromagnet exhibits a compensated spin configuration in which the net magnetization is zero, which is suitable for high-density memory devices; (2) the spin dynamics due to the anisotropypfiffiffieffiffilffidffiffiffi,ffiffiHffiffi A, and the exchange field, HE, is in the THz range, faster than that in the case of a ferromagnet by about 2–3 orders of magnitude;[13,14] and (3) there is a high degree of freedom in selecting materials with Neel temperature above room temperature regardless of metals, insulators, or semiconductors.[15,16,17]
Summary
Effective methods to manipulate the magnetic structures and dynamics of magnetic domains and domain walls have been developed. The theory predicted a giant MOKE in AFMs.[57] a single crystal Mn3Sn exhibited a MOKE signal comparable to that observed in a conventional ferromagnet at room temperature and zero magnetic field [Fig. 2(a)].58 Comparing the Kerr rotation angle spectrum and the first-principles calculation confirmed that this giant Kerr effect appears in association with the cluster magnetic octupole [Fig. 2(b)].
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