KAIST and Yonsei Researchers Advance Magnetism Control for Next-Gen Tech
Researchers from the Korea Advanced Institute of Science and Technology (KAIST) and Yonsei University have recently published two distinct theoretical studies, both significantly advancing the understanding of magnetism. These breakthroughs promise to reshape the landscape of next-generation electronic devices and memory technologies.
One study introduces a novel method for controlling magnetism using electron orbitals, a departure from conventional spin-based approaches, while a separate KAIST-led effort unveils a new mechanism for the spontaneous formation of skyrmions within magnetic materials.
Orbital-Based Magnetism Control: A New Path for Efficient Electronics
A joint research team from KAIST and Yonsei University has developed a groundbreaking theoretical framework for controlling magnetism through orbital exchange interaction. This innovative method offers a compelling alternative to existing spin-based control techniques, aiming to reduce heat generation, boost performance, and lower power consumption in future electronic devices.
While previous research in next-generation memory has predominantly focused on electron spin for information storage, this new study takes a different direction. It theoretically demonstrates that an electric current can induce a direct interaction between the orbital energy of electrons and the orbitals of magnetic materials. This fundamental interaction could significantly facilitate information transmission and processing.
The proposed mechanism is suggested to alter the intrinsic properties of magnets more efficiently than traditional spin-based approaches. The research indicates that electric current can modify crucial intrinsic magnetic properties, such as magnetic anisotropy and rotational characteristics. Calculations performed during the study further suggested that these orbital-based control effects could be stronger than those observed with current spin-based methods.
This significant finding points towards a future where electron orbitals play a central role in semiconductor components, enabling more powerful and energy-efficient devices. The proposed principle may also be applicable to altermagnetic materials, which are currently being explored for high-speed, low-power semiconductor devices and advanced memory technologies. This study provides a vital theoretical foundation for the development of future logic and memory devices.
- Publication: The research, first authored by Dr. Geun-Hee Lee (KAIST), with Professor Kyoung-Whan Kim (Yonsei University) and Professor Kyung-Jin Lee (KAIST) as co-corresponding authors, was published in Nature Communications on February 2.
- Funding: Provided by the Frontier Challenge R&D Project, the Mid-Career Researcher Program, the Science Research Center (SRC) program, the Early Career Researcher Program of the National Research Foundation of Korea, and Samsung Electronics.
Unlocking Skyrmion Formation: A New Mechanism Revealed
Separately, a research team at KAIST has proposed a groundbreaking theoretical framework for the formation of skyrmions in magnets. This framework suggests that skyrmions can form through fundamental physical interactions within magnets, specifically magnetoelastic coupling, without requiring certain external conditions previously thought necessary. This discovery significantly expands the potential for realizing skyrmions in a wider array of magnetic materials.
Skyrmions are unique, vortex-like arrangements of electron spins within a magnet. They are highly sought after for next-generation spintronics technology due to their desirable properties, including small size, stability, and potential for ultra-high-density, low-power information devices. Previous understanding typically suggested their formation depended on specific physical conditions, such as crystal asymmetry or strong spin-orbit coupling.
The KAIST team, led by Professor Se Kwon Kim from the Department of Physics, demonstrated that magnetoelastic coupling—the intricate interaction between a material's magnetism and its lattice structure—can be sufficient to spontaneously generate these complex vortex-like magnetic structures. When this coupling is sufficiently strong, it can trigger a transition from a uniformly aligned magnetic state to a new, vortex-like ordered state.
This newly identified process involves the simultaneous tilting of spins and distortion of the lattice, which ultimately results in the formation of a chiral spin texture comprising alternating skyrmions and antiskyrmions. The study is particularly relevant for the development and application of two-dimensional magnetic materials.
- Publication: The study, with Gyungchoon Go as the first author, was published in Physical Review Letters on February 11.
- Funding: Provided by the Samsung Future Technology Development Program, the Brain Pool Plus Program, and the Sejong Science Fellowship.