Noncollinear spin structure in Dy-doped classical ferrimagnet
Abstract
Noncollinear spin structures have attracted tremendous attention because they offer a versatile platform for spin control and manipulation, essential in spintronics. Realizing noncollinearity in ferrimagnetic insulators is of particular interest as they can be potentially utilized in low-damping spintronics with tunable magnetic order. Within the spinel-ferrite family, Zn and Al-substituted nickel ferrite (NiZAF) has emerged as an excellent choice for low-damping spintronics. However, realizing noncollinearity in such systems remains challenging. Here, we present evidence of noncollinear spin structure in the NiZAF thin films induced by the rare earth Dy-doping, utilizing the soft x-ray spectroscopy methods such as magnetic circular dichroism and x-ray resonant magnetic reflectivity (XRMR). In particular, XRMR reveals a spiral-type spin structure, which is attributed to the Dzyaloshinskii-Moriya interaction, arising due to broken inversion symmetry by the Dy-induced local strain field as confirmed by our theoretical calculations. The realization of noncollinearity in the spinel-ferrite opens pathway to explore the possibility of chiral magnetic domains and topological spin textures exhibiting promise for oxide-based spintronics
Keywords
Cite
@article{arxiv.2601.05762,
title = {Noncollinear spin structure in Dy-doped classical ferrimagnet},
author = {Anupam K. Singh and Katayoon Mohseni and Verena Ney and Andreas Ney and Yicheng Guan and Ilya Kostanovski and Malleshwararao Tangi and Mostafa I. S. Marzouk and Manuel Valvidares and Pierluigi Gargiani and Jean-Marc Tonnerre and P. F. Perndorfer and P. A. Buczek and Arthur Ernst and Holger L. Meyerheim and Stuart S. P. Parkin},
journal= {arXiv preprint arXiv:2601.05762},
year = {2026}
}