Recently, the research team led by Prof. DU Haifeng from High Magnetic field laboratory, Hefei Institutes of Physical Science of Chinese Academy of Sciences, achieved stable magnetic bundles at room temperature without the need for any external magnetic field.
Their work was published in Nature Communications.
Topological magnetic structures are a type of spin arrangement with nontrivial topological properties. These structures hold promise as the next-generation data carriers and could overcome limitations of traditional magnetic storage technologies in spintronics.
In previous research, the team had proposed a method for inducing magnetic skyrmion bundles in a chiral helimagnetic material called FeGe. However, achieving stable magnetic bundles at room temperature and without an external magnetic field remained a significant challenge for practical applications in spintronics.
To address this challenge, the researchers ingeniously combined pulsed currents with reversed magnetic fields in the room-temperature chiral helimagnetic material Co8Zn10Mn2. This approach allowed them to achieve a rich variety of room-temperature chiral magnetic skyrmions, avoiding the complex field cooling processes required in previous skyrmion bundles generation.
Furthermore, they introduced a special zero-field vertical spiral domain magnetization background to stabilize the magnetic skyrmions bundles. By establishing a complete magnetic field-temperature phase diagram for skyrmions bundles, they ultimately achieved stable isolated magnetic skyrmions bundles at room temperature with zero external magnetic field under free boundary conditions.
This work could enhance the development of topological spintronic devices, leveraging the freedom topological parameter constrain, according to the team.
(a) Magnetic skyrmion bundles with topological charge Q = 2. (b) Magnetic field vs temperature phase diagram of a stable skyrmion bundle with Q = 2. (Image by ZHANG Yongsen)
