Authors
Yu-Han Gao, Wen-Xiao Shi, Yuan-Sha Chen, Ji-Rong Sun, Qing-Lin Yang, Xu Yang, Zhuo Deng, Peng-Tao Yang, Zheng Chang, Hong-Mei Feng, Wei He, Xiang-Qun Zhang, Zhao-Hua Cheng
Published in
Physical review letters. Volume 137. Issue 12. Pages 126903. Sep 18, 2026.
Abstract
For ultrafast magnetization switching devices, critical slowing down in conventional ferromagnets near their Curie temperature constitutes a key challenge that must be overcome. In contrast to this typical behavior, we observe an anomalous acceleration of demagnetization in CaRuO_{3}/SrTiO_{3} superlattices, which are moderately correlated weak itinerant ferromagnets. The demagnetization rate increases with rising temperature, pump fluence, and applied magnetic field. To explain these anomalous phenomena, we develop a phenomenological model integrating the three-temperature model with self-consistent renormalization theory. Because the intrinsic gradient magnetism of the superlattice suppresses the typical divergence of specific heat, the conventional thermodynamic bottleneck is bypassed. Our model reveals that this decoupling enables the ultrafast dynamics to be predominantly governed by the spin-fluctuation-driven enhancement of the electron-spin scattering vertex. This Letter demonstrates how spatial inhomogeneity can decouple macroscopic thermodynamic singularities from microscopic scattering processes, offering a new paradigm for manipulating ultrafast spin dynamics in correlated quantum materials. The pronounced sensitivity of the demagnetization rate to external parameters further suggests the potential for designing highly tunable ultrafast spintronic devices that leverage enhanced fluctuations near the magnetic instability.
PMID:
42826948
Bibliographic data and abstract were imported from PubMed on 03 Oct 2026.
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