The crossbar pattern sample can generate different behaviors of vertical field-driven down-up DW motion without the use of HX, depending on the AFM spin configuration. DW propagation was measured after a) growing with randomly distributed AFM domains and b) positive and c) negative currents injected along the vertical (y-axis), respectively. DW motion in the horizontal branch after injection of d) positive current and e) negative current along the x-axis was also measured. Credit: Advanced Science
Researchers at the Daegu Gyeongbuk Science and Technology Research Institute (DGIST) in South Korea have demonstrated a new route for adjusting and controlling the movement of domain walls using a combination of useful magnetic effects in very thin film materials. rice field.Studies published in the journal Advanced scienceProvides new insights into spintronics and a step towards new ultra-fast, ultra-compact, and power-efficient IT devices.
Spintronics is a field of electronic equipment that uses the direction of electron spins rather than the direction of electron spins. charge.. The combination of spin and electron charge (already used in traditional electronic systems) provides a more powerful and versatile way to encode and decode data. Researchers believe that spintronics can be used, for example, to develop so-called “racetrack memory,” which pushes stored information along thin wires at high speed.
New research shows a new way to process information processing using the magnetic state motion of thin film devices. It takes advantage of some anomalous effects that occur when materials, including contrasting types of magnetic materials, are crushed together.
The research focuses on devices that combine so-called ferromagnetic and antiferromagnetic materials. In this device, the directions of electron spins are aligned differently within each magnetic material.
Many studies of spintronics have focused on the narrow area where two such contrasting magnetic materials meet and how this “domain” and “domain wall” can propagate. For example, external currents can shift magnetic domains, but this process is difficult to control and has not yet provided the exact movement scientists demand.
Jung-Il Hong of DGIST’s Emerging Materials Science Division and his colleagues are taking advantage of another “effective”. magnetic field It already existed in systems that combined DMI with the exchange bias effect. Spins are aligned in different ways depending on the magnetic field and current in the magnetic structure, and these combined magnetic effects can also control the behavior of magnetic domains.
It also shows that the orientation of the exchange bias field can be reconfigured simply by injecting spin current into the device, allowing electrical and programmable manipulation of the device.
“In order for spintronic devices to move from theory to reality, we need to properly understand the behavior of magnetic domains and the domain wall interfaces that separate them with multi-layer materials. domain Operation with device A structure that we believe can be easily integrated into a logic device. ”
Spintronics: Improving electronic devices with finer spin control
For more information:
Kim Hyun Joong et al., Programmable dynamics of exchange bias domain wall via spin current-induced antiferromagnetic switching, Advanced science (2021). DOI: 10.1002 / advs.202100908
Provided by DGIST (Daegu Gyeongbuk University of Science and Technology)
Quote: Https: //phys.org/news/2021-08-magnetic-domain-dynamics-ultrathin-multi-layered.html Ultra-thin multilayer material acquired on August 5, 2021 (August 4, 2021) ) Magnetic domain dynamics operation
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https://phys.org/news/2021-08-magnetic-domain-dynamics-ultrathin-multi-layered.html Manipulation of magnetic domain dynamics in ultra-thin multilayer materials
