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arXiv 2301.01403cond-mat.str-el
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氧化物超晶格合成磁序的原子尺度调制

Atomic-scale Modulation of Synthetic Magnetic Order in Oxide Superlattices

Seung Gyo Jeong, Sehwan Song, Sungkyun Park, Valeria Lauter, Woo Seok Choi

摘要:

对磁相互作用的原子尺度精确控制促进了对自旋电子学有用的合成自旋顺序,包括先进的存储器和量子逻辑器件。传统的调制合成自旋顺序已被限制到金属异质结构,利用RKKY相互作用,通过一个金属间隔层,然而,他们面临的焦耳加热和/或电击穿所产生的问题。在绝缘间隔层上的合成自旋序的实际实现和观察将导致具有完全不同概念的自旋相关器件的发展。在此,我们报道了在由铁磁金属层和非铁磁绝缘层组成的氧化物超晶格中合成螺旋自旋序的原子尺度调制。原子控制的超晶格表现出振荡的磁行为,代表着螺旋自旋结构的存在。深度敏感极化中子反射仪的证据调制的螺旋自旋结构作为一个功能的超导绝缘层厚度。自旋状态的原子尺度定制可以使该领域进一步走向实际的自旋电子应用。

英文摘要:

Atomic-scale precision control of magnetic interactions facilitates a synthetic spin order useful for spintronics, including advanced memory and quantum logic devices. Conventional modulation of synthetic spin order has been limited to metallic heterostructures that exploit RKKY interaction through a nonmagnetic metallic spacer; however, they face problems arising from Joule heating and/or electric breakdown. The practical realization and observation of a synthetic spin order across a nonmagnetic insulating spacer would lead to the development of spin-related devices with a completely different concept. Herein, we report the atomic-scale modulation of the synthetic spiral spin order in oxide superlattices composed of ferromagnetic metal and nonmagnetic insulator layers. The atomically controlled superlattice exhibit an oscillatory magnetic behavior, representing the existence of a spiral spin structure. Depth-sensitive polarized neutron reflectometry evidences modulated spiral spin structures as a function of the nonmagnetic insulator layer thickness. Atomic-scale customization of the spin state could lead the field one step further to actual spintronic applications.

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