Variable spin-charge conversion across metal-insulator transition.,Nature Communications

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Variable spin-charge conversion across metal-insulator transition.
Nature Communications ( IF 14.7 ) Pub Date : 2020-01-24 , DOI: 10.1038/s41467-020-14388-9
Taqiyyah S Safi ₁ , Pengxiang Zhang ₁ , Yabin Fan ₁ , Zhongxun Guo ₁ , Jiahao Han ₁ , Ethan R Rosenberg ₂ , Caroline Ross ₂ , Yaraslov Tserkovnyak ₃ , Luqiao Liu ₁

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The charge-to-spin conversion efficiency is a crucial parameter in determining the performance of many useful spintronic materials. Usually, this conversion efficiency is predetermined by the intrinsic nature of solid-state materials, which cannot be easily modified without invoking chemical or structural changes in the underlying system. Here we report on successful modulation of charge-spin conversion efficiency via the metal-insulator transition in a quintessential strongly correlated electron compound vanadium dioxide (VO2). By employing ferromagnetic resonance driven spin pumping and the inverse spin Hall effect measurement, we find a dramatic change in the spin pumping signal (decrease by > 80%) and charge-spin conversion efficiency (increase by five times) upon insulator to metal transition. The abrupt change in the structural and electrical properties of this material therefore provides useful insights on the spin related physics in a strongly correlated material undergoing a phase transition.

中文翻译：

跨金属-绝缘体转变的可变自旋电荷转换。

电荷到自旋的转换效率是决定许多有用的自旋电子材料性能的关键参数。通常，这种转换效率是由固态材料的固有特性预先确定的，如果不对底层系统进行化学或结构更改，就很难轻易地对其进行修改。在这里，我们报告了在典型的强相关电子化合物二氧化钒（VO2）中通过金属-绝缘体跃迁成功调制电荷自旋转换效率的过程。通过采用铁磁共振驱动的自旋泵浦和逆自旋霍尔效应测量，我们发现在绝缘体向金属过渡时，自旋泵浦信号（降低> 80％）和电荷自旋转换效率（提高了五倍）发生了显着变化。

更新日期：2020-01-24

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