Position error-free control of magnetic domain-wall devices via spin-orbit torque modulation

• Published in: Nature communications Vol. 14; no. 1; pp. 7648 - 7
• Main Authors: Lee, Seong-Hyub, Kim, Myeonghoe, Whang, Hyun-Seok, Nam, Yune-Seok, Park, Jung-Hyun, Kim, Kitae, Kim, Minhwan, Shin, Jiho, Yu, Ji-Sung, Yoon, Jaesung, Chang, Jun-Young, Kim, Duck-Ho, Choe, Sug-Bong
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 23.11.2023; Nature Publishing Group; Nature Portfolio
• Subjects: 142/126; 147/135; 147/28; 147/3; 639/301/119/1001; 639/925/927/1062; Data storage; Disk drives; Domain walls; Flash memory (computers); Hard disks; Humanities and Social Sciences; Magnetic domains; Memory devices; Modulation; multidisciplinary; Position errors; Science; Science (multidisciplinary); Shift registers; Stochasticity; Torque
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/s41467-023-43468-9

Magnetic domain-wall devices such as racetrack memory and domain-wall shift registers facilitate massive data storage as hard disk drives with low power portability as flash memory devices. The key issue to be addressed is how perfectly the domain-wall motion can be controlled without deformation, as it can replace the mechanical motion of hard disk drives. However, such domain-wall motion in real media is subject to the stochasticity of thermal agitation with quenched disorders, resulting in severe deformations with pinning and tilting. To sort out the problem, we propose and demonstrate a new concept of domain-wall control with a position error-free scheme. The primary idea involves spatial modulation of the spin-orbit torque along nanotrack devices, where the boundary of modulation possesses broken inversion symmetry. In this work, by showing the unidirectional motion of domain wall with position-error free manner, we provide an important missing piece in magnetic domain-wall device development. For magnetic domain-wall devices, key issue to be addressed is nonstochastic displacement of magnetic domain wall. Here, authors report domain-wall control with a position error-free scheme via spin-orbit torque modulation along nanotrack devices.