Journal
FRONTIERS IN PHYSICS
Volume 11, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fphy.2023.1124924
Keywords
oxide; 2D magnetic order; defect-induced magnetism; ion irradiation; vacancy-interstitial pairs; surface ferromagnetism
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Magnetic order induced by atomic lattice defects can be observed at room temperature in various non-magnetic hosts. Pure TiO2 (anatase) shows an ultrathin magnetic layer with perpendicular magnetic anisotropy at its surface when triggered by low-energy ion irradiation.
Magnetic order at room temperature induced by atomic lattice defects, like vacancies, interstitials, or their pairs, has been observed in a large number of different non-magnetic hosts, such as pure graphite, oxides, and silicon-based materials. High Curie temperatures and time-independent magnetic response at room temperature indicate the extraordinary robustness of this new phenomenon in solid-state magnetism. In this work, we review experimental and theoretical results of pure TiO2 (anatase), whose magnetic order can be triggered by low-energy ion irradiation. In particular, we discuss the systematic observation of an ultrathin magnetic layer with perpendicular magnetic anisotropy at the surface of this oxide.
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