Probing magnetism in 2D van der Waals crystalline insulators via electron tunneling
Probing magnetism in 2D van der Waals crystalline insulators via electron tunneling
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DOI：
10.1126/science.aar3617
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发表时间：
2018-06-15
期刊：
影响因子：
56.9
通讯作者：
Jarillo-Herrero, P.
中科院分区：
文献类型：
--
作者：
Klein, D. R.;MacNeill, D.;Jarillo-Herrero, P.
磁绝缘体是下一代自旋电子和拓扑器件的关键资源。层状金属卤化物家族有望实现多种磁态，包括超薄绝缘多铁质、自旋液体和铁磁体，但需要面向器件的表征方法来释放其潜力。本文报道了层状磁绝缘体CrI3的隧穿随温度和外加磁场的变化规律。我们电检测了磁基态和层间耦合，并观察了场致变磁跃迁。超磁跃迁导致双层、三层和四层CrI3势垒的磁阻分别为95,300和550%。我们进一步测量了结的非弹性隧穿光谱，揭示了与CrI3中的集体磁激发（磁振子）一致的丰富光谱。
Magnetic insulators are a key resource for next-generation spintronic and topological devices. The family of layered metal halides promises varied magnetic states, including ultrathin insulating multiferroics, spin liquids, and ferromagnets, but device-oriented characterization methods are needed to unlock their potential. Here, we report tunneling through the layered magnetic insulator CrI3 as a function of temperature and applied magnetic field. We electrically detect the magnetic ground state and interlayer coupling and observe a field-induced metamagnetic transition. Themetamagnetic transition results in magnetoresistances of 95, 300, and 550% for bilayer, trilayer, and tetralayer CrI3 barriers, respectively. We further measure inelastic tunneling spectra for our junctions, unveiling a rich spectrum consistent with collective magnetic excitations (magnons) in CrI3.