High-density, spontaneous magnetic biskyrmions induced by negative thermal expansion in ferrimagnets.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 37672584.
- Also identified by DOI 10.1126/sciadv.adi1984 and PMC identifier 10482331.
- Licence recorded as CC BY-NC.
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Abstract
Magnetic skyrmions are topologically protected quasiparticles that are promising for applications in spintronics. However, the low stability of most magnetic skyrmions leads to either a narrow temperature range in which they can exist, a low density of skyrmions, or the need for an external magnetic field, which greatly limits their wide application. In this study, high-density, spontaneous magnetic biskyrmions existing within a wide temperature range and without the need for a magnetic field were formed in ferrimagnets owing to the existence of a negative thermal expansion of the lattice. Moreover, a strong connection between the atomic-scale ferrimagnetic structure and nanoscale magnetic domains in Ho(Co,Fe)<sub>3</sub> was revealed via in situ neutron powder diffraction and Lorentz transmission electron microscopy measurements. The critical role of the negative thermal expansion in generating biskyrmions in HoCo<sub>3</sub> based on the magnetoelastic coupling effect is further demonstrated by comparing the behavior of HoCo<sub>2.8</sub>Fe<sub>0.2</sub> with a positive thermal expansion.