Excitation of Terahertz Magnons in Antiferromagnetic Nanostructures: Theory and Experiment
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tion of Terahertz Magnons in Antiferromagnetic Nanostructures: Theory and Experiment A. R. Safina,e,*, S. A. Nikitova,b,c,**, A. I. Kirilyuka,d, D. V. Kalyabina,b, A. V. Sadovnikova,c, P. A. Stremoukhova,b,d, M. V. Logunova, and P. A. Popova,b a Kotel’nikov
b
Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow, 125009 Russia Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Moscow region, 141700 Russia c Saratov State University, Saratov, 410071 Russia d FELIX Laboratory, Radboud University 6525, ED Nijmegen, The Netherlands e National Research University “Moscow Power Engineering Institute,” Moscow, 111250 Russia *e-mail: [email protected] **e-mail: [email protected] Received January 28, 2020; revised January 28, 2020; accepted March 10, 2020
Abstract—The theoretical and experimental studies of the excitation, detection, and propagation of magnons in antiferromagnetic nanostructures have been reviewed. The properties of antiferromagnetic materials such as the absence of a macroscopic magnetization, the presence of strong exchange interactions, and a complex magnetocrystalline structure make it possible to implement new types of memory and functional electronic devices. The study of possible magnon effects in antiferromagnetic materials in micro- and nanoscales requires new experimental and theoretical approaches. In this review, the recent results on the excitation of magnetic oscillations—magnons—in antiferromagnetic materials induced by the current and optical radiation are described and systematized. The main theoretical results on antiferromagnets and multilayer antiferromagnetic heterostructures are presented. Models for description of phenomena induced by the current and optical pulses in nanoheterostructures including antiferromagnets are considered. Methods for studying antiferromagnetic micro- and nanostructures by means of Brillouin scattering, as well as prospects of the application of antiferromagnetic spintronics and magnonics, are briefly discussed. DOI: 10.1134/S1063776120070110
1. INTRODUCTION Active studies of antiferromagnetic materials and structures, particularly with sizes of several to hundreds of nanometers, recently provide results underlying a new scientific field, antiferromagnetic spintronics [1– 3]. Antiferromagnetic spintronics concerns processes of transfer of magnetic moment or spin by an electric current in structures containing antiferromagnetic components. Spin can also be transferred by magnons, which are spin wave quanta, in antiferromagnets, metals, and insulators [4]. Correspondingly, a new field of spintronics, antiferromagnetic magnonics, appears to study the physical properties of antiferromagnetic micro- and nanostructures, properties of spin waves in them, and the possibility of application of spin waves to fabricate functional components of devices for the generation, detection, and procession of millimeter and submillimeter wavelength signals [5, 6]. Numerous works on antiferromagnetic spintronics a
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