近日，德国美因茨约翰内斯古腾堡大学Mathias Kläui团队报道了由动态轨道角动量驱动的反铁磁体CoO的轨道磁阻。2026年7月2日，《科学》杂志发表了这一成果。

近期关于轨道电流效应比自旋电流大数个数量级的预测引起了广泛关注。近期关于轨道电流效应比自旋电流大数个数量级的预测引起了广泛关注。然而，轨道电流必须首先转换为自旋电流，才能与常规磁体中由自旋角动量主导的静态磁化发生相互作用。

通过使用一种由轨道角动量（OAM）主导的磁体，研究组展示了在氧化亚钴/铜（CoO/Cu）中，轨道霍尔磁阻相较于氧化亚钴/铂（CoO/Pt）中的自旋霍尔磁阻增强了70倍。这一增强源于表面氧化Cu的动态轨道角动量与反铁磁绝缘体CoO中静态轨道角动量之间的相互作用。该结果表明，通过使用OAM主导的材料，可以利用巨大轨道电流所带来的优势，而这在传统的自旋主导磁体中是无法实现的。

附：英文原文

Title: Orbital magnetoresistance in the antiferromagnet CoO driven by dynamic orbital angular momentum

Author: Christin Schmitt, Sachin Krishnia, Mahmoud Zeer, Edgar Galíndez-Ruales, Mehak Loyal, Jonas Khler, Luca Micus, Takashi Kikkawa, Hiroki Arisawa, Thibaud Denneulin, András Kovács, Renyou Xu, Duc Tran, Florian Kronast, Dongwook Go, Leonid V. Pourovskii, Rafal E. Dunin-Borkowski, Timo Kuschel, Marjana Leai, Jairo Sinova, Eiji Saitoh, Gerhard Jakob, Olena Gomonay, Yuriy Mokrousov, Mathias Klui

Issue&Volume: 2026-07-02

Abstract: Recent predictions of orders of magnitude larger orbital current effects compared with spin currents have attracted considerable interest. However, orbital currents must first be converted into spin currents to interact with the static magnetization dominated by spin angular momentum in conventional magnets. By using a magnet dominated by orbital angular momentum (OAM), we demonstrate a 70-fold enhancement in orbital Hall magnetoresistance in cobalt II oxide/copper (CoO/Cu*), compared with spin Hall magnetoresistance in cobalt II oxide/platinum (CoO/Pt). This arises from interactions between dynamic OAM from surface-oxidized Cu* and static OAM in the antiferromagnetic insulator CoO. Our results show how by using OAM-dominated materials, we can harness the benefits of giant orbital currents that have not been possible using conventional spin-dominated magnets.

DOI: adw1808

Source: https://www.science.org/doi/10.1126/science.adw1808

期刊信息

Science：《科学》，创刊于1880年。隶属于美国科学促进会，最新IF：63.714

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