Mn₂Au/NiFe薄膜双层中 ferromagnetic 和 antiferromagnetic 自旋动力学的耦合

Coupling of Ferromagnetic and Antiferromagnetic Spin Dynamics in Mn_{2}Au/NiFe Thin Film Bilayers.

作者信息

Al-Hamdo Hassan, Wagner Tobias, Lytvynenko Yaryna, Kendzo Gutenberg, Reimers Sonka, Ruhwedel Moritz, Yaqoob Misbah, Vasyuchka Vitaliy I, Pirro Philipp, Sinova Jairo, Kläui Mathias, Jourdan Martin, Gomonay Olena, Weiler Mathias

机构信息

Fachbereich Physik and Landesforschungszentrum OPTIMAS, Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, 67663 Kaiserslautern, Germany.

Institute of Physics, Johannes Gutenberg-University Mainz, 55099 Mainz, Germany.

出版信息

Phys Rev Lett. 2023 Jul 28;131(4):046701. doi: 10.1103/PhysRevLett.131.046701.

DOI:10.1103/PhysRevLett.131.046701

PMID:37566862

Abstract

We investigate magnetization dynamics of Mn_{2}Au/Py (Ni_{80}Fe_{20}) thin film bilayers using broadband ferromagnetic resonance (FMR) and Brillouin light scattering spectroscopy. Our bilayers exhibit two resonant modes with zero-field frequencies up to almost 40 GHz, far above the single-layer Py FMR. Our model calculations attribute these modes to the coupling of the Py FMR and the two antiferromagnetic resonance (AFMR) modes of Mn_{2}Au. The coupling strength is in the order of 1.6 T nm at room temperature for nm-thick Py. Our model reveals the dependence of the hybrid modes on the AFMR frequencies and interfacial coupling as well as the evanescent character of the spin waves that extend across the Mn_{2}Au/Py interface.

摘要

我们使用宽带铁磁共振（FMR）和布里渊光散射光谱研究了Mn₂Au/Py（Ni₈₀Fe₂₀）薄膜双层的磁化动力学。我们的双层膜展现出两种共振模式，其零场频率高达近40 GHz，远高于单层Py的FMR。我们的模型计算将这些模式归因于Py FMR与Mn₂Au的两种反铁磁共振（AFMR）模式的耦合。对于纳米厚的Py，室温下耦合强度约为1.6 T·nm。我们的模型揭示了混合模式对AFMR频率和界面耦合的依赖性，以及跨越Mn₂Au/Py界面延伸的自旋波的倏逝特性。