Wimmer T, Kamra A, Gückelhorn J, Opel M, Geprägs S, Gross R, Huebl H, Althammer M
Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany.
Physik-Department, Technische Universität München, 85748 Garching, Germany.
Phys Rev Lett. 2020 Dec 11;125(24):247204. doi: 10.1103/PhysRevLett.125.247204.
We report on experiments demonstrating coherent control of magnon spin transport and pseudospin dynamics in a thin film of the antiferromagnetic insulator hematite utilizing two Pt strips for all-electrical magnon injection and detection. The measured magnon spin signal at the detector reveals an oscillation of its polarity as a function of the externally applied magnetic field. We quantitatively explain our experiments in terms of diffusive magnon transport and a coherent precession of the magnon pseudospin caused by the easy-plane anisotropy and the Dzyaloshinskii-Moriya interaction. This experimental observation can be viewed as the magnonic analog of the electronic Hanle effect and the Datta-Das transistor, unlocking the high potential of antiferromagnetic magnonics toward the realization of rich electronics-inspired phenomena.
我们报告了一些实验，这些实验展示了利用两条铂带进行全电磁振子注入和检测，从而在反铁磁绝缘体赤铁矿薄膜中实现磁振子自旋输运和赝自旋动力学的相干控制。在探测器处测得的磁振子自旋信号显示其极性随外加磁场而振荡。我们根据扩散磁振子输运以及由易平面各向异性和Dzyaloshinskii-Moriya相互作用引起的磁振子赝自旋的相干进动，对我们的实验进行了定量解释。这一实验观察结果可被视为电子Hanle效应和Datta-Das晶体管的磁振子类似物，开启了反铁磁磁振子在实现丰富的受电子学启发现象方面的巨大潜力。
