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Stable magnetic beams obtained at room temperature and zero magnetic field

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Stable magnetic beams obtained at room temperature and zero magnetic field

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by Wei Wensen and Zhao Weiwei, Hefei Institutes of Physical Sciences, Chinese Academy of Sciences


Scenario for creating zero-field skyrmion beams and their three-dimensional magnetic configurations. A Skyrmion bundle creation scenario. The images below display the corresponding simulated Fresnel images. b–d Outline of mz= −0.1 at the upper surface (z = 0 nm), at the level of the intermediate layer (z = 80 nm), and the lower surface (z= 160 nm) of a Q = 2 packages. ⊙ and ⊗\otimes represent the up and down orientations of polarity. e–g Magnetic configurations in the upper, middle and lower layers of the Q= 2 packages. The color wheel represents magnetizations. Credit: Natural communications(2024). DOI: 10.1038/s41467-024-47730-6

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Scenario for creating zero-field skyrmion beams and their three-dimensional magnetic configurations. A Skyrmion bundle creation scenario. The images below display the corresponding simulated Fresnel images. b–d Outline of mz= −0.1 at the upper surface (z= 0 nm), at the level of the intermediate layer (z= 80 nm), and the lower surface (z= 160 nm) of a Q= 2 packages. ⊙ and ⊗\otimes represent the up and down orientations of polarity. e–g Magnetic configurations in the upper, middle and lower layers of the Q= 2 packages. The color wheel represents magnetizations. Credit: Natural communications(2024). DOI: 10.1038/s41467-024-47730-6

Recently, the research team led by Professor Du Haifeng from the High Magnetic Field Laboratory of the Hefei Institute of Physical Sciences of the Chinese Academy of Sciences obtained stable magnetic beams at room temperature without the use of a magnetic field external.

Their work is published in Natural communications.

Topological magnetic structures are a type of spin arrangement with non-trivial topological properties. These structures show promise as next-generation data carriers and could overcome the limitations of traditional spintronics magnetic storage technologies.

In previous research, the team proposed a method to induce magnetic skyrmion beams in a chiral helimagnetic material called FeGe. However, obtaining stable magnetic beams at room temperature and without an external magnetic field remains an important challenge for practical applications in spintronics.

To address this challenge, the researchers ingeniously combined pulsed currents with inverted magnetic fields in the chiral helimagnetic material Co.8ZntenMn2. This approach allowed them to obtain a wide variety of chiral magnetic skyrmions at room temperature, thus avoiding the complex field cooling processes required in the previous generation of skyrmion beams.

Additionally, they introduced a special zero-field vertical spiral domain magnetization background to stabilize the magnetic skyrmion beams. By establishing a complete magnetic field-temperature phase diagram for the skyrmion beams, they finally obtained isolated and stable magnetic skyrmion beams at room temperature with zero external magnetic fields under free boundary conditions.

According to the team, this work could improve the development of topological spintronic devices, taking advantage of the freedom from topological parameter constraints.

More information:
Yongsen Zhang et al, Stable skyrmion beams at room temperature and zero magnetic field in a chiral magnet, Natural communications(2024). DOI: 10.1038/s41467-024-47730-6

Journal information:
Natural communications

Provided by Hefei Institutes of Physical Sciences, Chinese Academy of Sciences