Researchers from the Korea Research Institute of Standards and Science (KRISS), Konkuk University, Ulsan National Institute of Science and Technology (UNIST) and Pusan National University have pioneered the world's first transistor capable of controlling skyrmions. This breakthrough paves the way for the development of next-generation ultra-low-power devices and is anticipated to make significant contributions to quantum and AI research.
Skyrmions, arranged in a vortex-like spin structure, are unique because they can be miniaturized to several nanometers, making them movable with exceptionally low power. This characteristic positions them as a crucial element in the evolution of spintronics applications.
Acting as an amplifier and switch for electrical currents, the transistor has been pivotal in the field of electronic engineering. The discovery of the skyrmion in 2009 sparked widespread research into a skyrmion-based transistor, but the absence of essential technology to control skyrmion movement thwarted these efforts.
This bottleneck was addressed with the team's skyrmion transistor, which leverages proprietary technology to electronically manage the movement of skyrmions created in magnetic materials. This innovative solution enables the precise control of skyrmion flow or halting, akin to how conventional transistors modulate electric current.
A critical aspect of managing magnetic skyrmion movement lies in controlling magnetic anisotropy, which influences the energy of skyrmions. Previous research sought to regulate magnetic anisotropy through oxygen movement within devices but failed to achieve uniform control.
Overcoming this challenge, the team developed a method for uniform control of magnetic anisotropy by leveraging hydrogen within aluminum oxide insulators, marking a world-first in the experimental implementation of skyrmion transistors.
The advent of the spintronics transistor is set to expedite the development of spintronics-based devices, such as neuromorphic and logic devices, which offer substantial advantages in power consumption, stability, and speed over traditional electronic devices.
Dr. Chan Yong Hwang, a director of the KRISS Quantum Technology Institute, says, "Major Korean companies are pivoting their focus to next-generation semiconductors that utilize spintronics to transcend the constraints of current silicon semiconductors. We plan to advance spintronics-related technology further and incorporate them into next-generation semiconductor devices and quantum technology."
Reflecting on the significance of the achievement, Dr. Seungmo Yang, a senior researcher at KRISS, says, "The transistor ignited the digital revolution of the 20th century. Now, the skyrmion transistor is poised to catalyze a similar transformation, propelling the spintronics technology revolution of the 21st century."