Low-Dimensionality-Induced Tunable Ferromagnetism in SrRuO<sub>3</sub> Ultrathin Films.
basic_science · Level V
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- Record sourced from PubMed, PMID 41478846.
- Also identified by DOI 10.1021/acs.nanolett.5c05253.
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Abstract
Quantum materials near electronic or magnetic phase boundaries exhibit enhanced tunability as their emergent properties become highly sensitive to external perturbations. Here, we demonstrate precise control of ferromagnetism in a SrRuO<sub>3</sub> ultrathin film, where a high density of states (DOS), arising from low-dimensional quantum states, places the system at the crossover between a nonmagnetic and bulk ferromagnetic state. Using spin- and angle-resolved photoemission spectroscopy (SRPES/ARPES), transport measurements, and theoretical calculations, we systematically tune the Fermi level via electron doping across the high-DOS point. We directly visualize the spin-split band structure and reveal its influence on both the magnetic and transport properties. Our findings provide compelling evidence that magnetism can be engineered through DOS control at a phase crossover, establishing a pathway for the rational design of tunable quantum materials.