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首页> 外文期刊>Physical review >(LaCoO_3)_n/(SrCoO_(2.5))_n superlattices: Tunable ferromagnetic insulator
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(LaCoO_3)_n/(SrCoO_(2.5))_n superlattices: Tunable ferromagnetic insulator

机译：（LaCoO_3）_n /（SrCoO_（2.5））_ n超晶格：可调谐铁磁绝缘体

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摘要

Ferromagnetic insulators have great potential for spintronic applications. For such applications, it is essential to find materials with a robust and controllable ferromagnetic insulating phase. However, because ferromagnetism in functional transition-metal oxides is usually coupled to metallicity, ferromagnetic insulators are very rare and independent control of their magnetic and electrical properties is difficult. In this study, the electrical, magnetic, and optical properties of (LaCoO3)(n)/(SrCoO2.5)(n) superlattice films are investigated for the manipulation of the ferromagnetic insulating phase. While the superlattices remain insulating irrespective of the periodicity n, the electronic structure and magnetic state vary drastically. Superlattices with large periodicities n of 10 and 20 show a ferromagnetic transition at a critical temperature T-C of similar to 80 K. With decreasing periodicity and increasing interface density of the superlattices, system with n = 4 becomes almost nonmagnetic, while in systems with n = 2 and 1, a reentrant ferromagnetic phase is observed at T-C of similar to 180 and similar to 225 K, respectively. Optical spectroscopy reveals that the fine control of the magnetic ground state is achieved by the modified electronic structure associated with the spin-state transition. Our results suggest an important design principle to create and manipulate the ferromagnetic insulating properties of Co-based oxide thin films.
机译：铁磁绝缘子在自旋电子学应用中具有巨大的潜力。对于此类应用，必须找到具有坚固且可控的铁磁绝缘相的材料。但是，由于功能过渡金属氧化物中的铁磁性通常与金属性相关，因此铁磁绝缘子非常罕见，并且很难独立控制其磁和电性能。在这项研究中，研究（LaCoO3）（n）/（SrCoO2.5）（n）超晶格薄膜的电，磁和光学性质，以处理铁磁绝缘相。尽管超晶格与周期n无关地保持绝缘，但电子结构和磁态却急剧变化。周期性n分别为10和20的超晶格在临界温度TC接近80 K时显示出铁磁跃迁。随着周期性的降低和超晶格界面密度的增加，n = 4的系统几乎变为非磁性，而在n = 4的系统中如图2和图1所示，在TC处观察到了重入铁磁相，分别类似于180 K和225K。光谱学表明，通过与自旋态跃迁相关的改进的电子结构，可以实现对磁性基态的精细控制。我们的结果提出了重要的设计原则，以创建和操纵Co基氧化物薄膜的铁磁绝缘性能。

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  • 来源
    《Physical review》 |2019年第6期|64415.1-64415.7|共7页
  • 作者

    Noh S.; Ahn G.; Seo J.; Gai Zheng; Lee Ho; Choi Woo; Moon S.;

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    Hanyang Univ Dept Phys Seoul 04763 South Korea;

    Oak Ridge Natl Lab Ctr Nanophase Mat Sci Oak Ridge TN 37831 USA;

    Oak Ridge Natl Lab Mat Sci & Technol Div Oak Ridge TN 37831 USA;

    Oak Ridge Natl Lab Mat Sci & Technol Div Oak Ridge TN 37831 USA|Sungkyunkwan Univ Dept Phys Suwon 16419 South Korea;

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