Magnetic anisotropy in atomically thin correlated heterostructures is essential for exploring quantum magnetic phases for next-generation spintronics. Whereas previous studies have mostly focused on van der Waals systems, here, we investigate the impact of dimensionality of epitaxially-grown correlated oxides down to the monolayer limit on structural, magnetic, and orbital anisotropies. By designing oxide superlattices with a correlated ferromagnetic SrRuO3 and nonmagnetic SrTiO3 layers, we observed modulated ferromagnetic behavior with the change of the SrRuO3 thickness. Especially, for three-unit-cell-thick layers, we observe a significant 1,500% improvement of coercive field in the anomalous Hall effect, which cannot be solely attributed to the dimensional crossover in ferromagnetism. The atomic-scale heterostructures further reveal the systematic modulation of anisotropy for the lattice structure and orbital hybridization, explaining the enhanced magnetic anisotropy. Our findings provide valuable insights into engineering the anisotropic hybridization of synthetic magnetic crystals, offering a tunable spin order for various applications.
@article{arxiv.2407.03231,
title = {Dimensionality Engineering of Magnetic Anisotropy from Anomalous Hall Effect in Synthetic SrRuO3 Crystals},
author = {Seung Gyo Jeong and Seong Won Cho and Sehwan Song and Jin Young Oh and Do Gyeom Jeong and Gyeongtak Han and Hu Young Jeong and Ahmed Yousef Mohamed and Woo-suk Noh and Sungkyun Park and Jong Seok Lee and Suyoun Lee and Young-Min Kim and Deok-Yong Cho and Woo Seok Choi},
journal= {arXiv preprint arXiv:2407.03231},
year = {2024}
}