Study of the Magneto-Optical Properties of Structures on Curved Surfaces for Creating Memory Elements on Magnetic Vortic
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y of the Magneto-Optical Properties of Structures on Curved Surfaces for Creating Memory Elements on Magnetic Vortices A. V. Prokaznikova, * and V. A. Paporkovb aYaroslavl
Branch, Valiev Physics and Technology Institute, Russian Academy of Sciences, Yaroslavl, 150007 Russia b Demidov Yaroslavl State University, Yaroslavl, 150003 Russia *e-mail: [email protected] Received October 19, 2019; revised October 22, 2019; accepted December 16, 2019
Abstract―The regularities of the magneto-optical (MO) response of the metallized surface of nanostructured lead selenide are studied. The MO hysteresis loops (MOHLs) of the equatorial Kerr effect (MOEKE) exhibit the characteristic features inherent to the presence of vortex magnetic structures in the system. The regularities of the evolution of the shape of the hysteresis loops of the MOEKE depending on the characteristic sizes of nanostructures, the thickness of the magnetic film, and the incidence angle of electromagnetic radiation are studied. It is shown that the formation of vortex magnetic structures corresponds to the minimum energy losses for remagnetization. Computer modeling of the regularities of the appearance and development of vortex magnetic structures on curved surfaces is carried out. DOI: 10.1134/S1063739720040071
INTRODUCTION Currently, considerable attention is being paid to the development of magnetic memory based on the topological features of magnetic structures. One of the first studies in this direction is the work [1], in which the principles of the functioning of magnetic memory based on the movement of domain walls in magnetic nanowires due to pulses of a spin-polarized current are formulated. In subsequent works, the concept of reducing the size of elementary magnetic configurations by using topological vortex magnetic structures was adopted [2–6]. To date, a large number of works have been presented in the field of development and miniaturization of magnetic memory based on topological magnetic structures in condensed media of reduced dimension, including those with complex surface topology [7, 8]. Due to the greater stability of vortex structures on curved surfaces, the topology of the magnetic surface plays a significant role in stabilizing and controlling the parameters of nanometer-sized magnetic structures [9]. The creation of nanometer structures with a curved surface is a separate technological problem that can be solved in various ways [10–12]. The technological implementation of magnetic memory, based on the properties of magnetic vortex structures, requires a clear fixation of the position of the vortex for the writing/reading procedure. In this respect, a structured environment, in particular, similar to the one proposed in [3] for implementing the racetrack memory, is used. Interest in the use of nano-
structured systems for the creation of magnetic memory components is due to the clear fixation of the localization region of the smallest unit of information (see, for example, [13]). Nanostructures with complex topology can be created
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