Oxygen Vacancy Engineering for Highly Tunable Ferromagnetic Properties: A Case of SrRuO₃ Ultrathin Film with a SrTiO₃ Capping Layer

Abstract

Oxide heterostructures have great potential for spintronics applications due to their well-defined heterointerfaces and vast functionalities. To integrate such compelling features into practical spintronics devices, effective control of the magnetic switching behavior is key. Here, continuous control of the magnetic coercive field in SrTiO 3 /SrRuO 3 ultrathin heterostructures is achieved by oxygen vacancy (V O) engineering. Pulsed laser deposition of an oxygen-deficient SrTiO 3 capping layer can trigger V O migration into the SrRuO 3 layer while avoiding the formation of Ru vacancies. Moreover, by varying the thickness and growth conditions of the SrTiO 3 capping layer, the value of the coercive field (H C) in the ferromagnetic SrRuO 3 layer can be continuously tuned. The maximum enhancement of H C at 5 K is 3.2 T. Such a wide-range tunability of H C may originate from a V O-induced enhancement of perpendicular magnetic anisotropy and domain wall pinning. This study offers effective approaches for controlling physical properties of oxide heterostructures via V O engineering, which may facilitate the development of oxide-based functional devices.

Evidence of Mn-Ion Structural Displacements Correlated with Oxygen Vacancies in La0.7Sr0.3MnO3 Interfacial Dead Layers

“…The strain, the changes in the Mn valence state, and the variations in oxygen signal provide combined evidence of a deviation from the typical perovskite structure of LSMO in the proximity of the interface. The vacancies in ultrathin oxide films can form due to multiple reasons such as the interlayer effect, 65 chemical potential difference, 66 or during the growth stage of the LSMO film. 31 In our case, oxygen vacancies in the LSMO films cannot be attributed to any chemical effect since EDXS measurements do not show any cation inter-diffusion across the film/substrate interfaces (see Figure S3).…”

Boosting Chemoselective Hydrogenation of Nitroaromatic via Synergy of Hydrogen Spillover and Preferential Adsorption on Magnetically Recoverable Pt@Fe2O3

“…Figure 2k and Table S5 (Supporting Information) showed the field-dependent magnetic characterization of Pt@Fe 2 O 3 -V O measured under a magnetic field ranging from −30 to 30 kOe at 300 K. The result indicated that the saturation magnetization value from Pt@Fe 2 O 3 to Pt@Fe 2 O 3 -LV O / MV O /HV O was increased from 1.22 to 1.73, 18.5, 56.9 emu g −1 , respectively, which originated from the incremental V O density. [44] The magnetism of the Pt@Fe 2 O 3 -V O not only indicates the successful construction of V O on Pt@Fe 2 O 3 that is favorable for selective hydrogenation, but also brings an extra benefit that endows facile magnetic recovery capability after catalytic reaction.…”

Interfacial engineering manipulation of magnetic anisotropy evolution via orbital reconstruction in low-dimensional manganite superlattices

“…Artificial oxide heterostructures with chemically abrupt interfaces provide a platform for exploring emergent phenomena [22][23][24][25]. The engineered interfacial interactions among the lattice, spin, charge, and orbital degrees of freedom are found to play a direct and crucial role in the properties of 3d transition oxide materials [26][27][28][29][30]. In the present work, a series of structure compatible LSMO(4)/SrMnO 3 (n) superlattices were deposited onto the (001)-oriented SrTiO 3 (STO) substrates.…”