Abstract
Effective control of magnetic anisotropy is important for developing spintronic devices. In this work, we performed a case study of stacking periods (N)-mediated reorientation of lateral magnetic anisotropy in ultrathin La0.67Ca0.33MnO3/SrRuO3 superlattices. As N increases from 1 to 15, the magnetic easy-axis switches from the orthorhombic [010] to [100]-axis. The maximum anisotropy constant of the superlattice (SL) (N = 15) reaches −1.83 × 105 erg/cm3. X-ray absorption spectroscopy and x-ray linear dichroism further suggest that the observed changes in lateral magnetic anisotropy are driven by in-plane orbital polarization. For SLs with small N, anisotropic strain-induced orbital polarization along the b-axis can result in the [010]-oriented magnetic easy axis. For SLs with large N, the dimension crossover from 2-dimension to 3-dimension could enhance the hybridization of Ru t2g and Mn dx2−y2 orbitals, which can compete with the strain effect and switch the magnetic easy axis to [100]. Our results suggest a potential strategy for engineering magnetic anisotropy through the cooperation of strain engineering and interfacial orbital engineering.
Highlights
Magnetism in low-dimensional epitaxial oxide systems has attracted continuous and considerable research attention due to the potential in spintronic memory and logic devices.1,2 In particular, magnetic anisotropy (MA), including lateral magnetic anisotropy (LMA) and perpendicular magnetic anisotropy (PMA), is one of the most important properties and tuning knobs in oxide heterostructures with ferromagnetism
Our results suggest a potential strategy for engineering magnetic anisotropy through the cooperation of strain engineering and interfacial orbital engineering
We found that the samples with small and large N have distinct in-plane orbital polarizations, which could originate from the anisotropic-strain-induced Mn dx2−y2 orbital polarization and hybridization with the Ru dxz/dyz orbital
Summary
Magnetism in low-dimensional epitaxial oxide systems has attracted continuous and considerable research attention due to the potential in spintronic memory and logic devices. In particular, magnetic anisotropy (MA), including lateral magnetic anisotropy (LMA) and perpendicular magnetic anisotropy (PMA), is one of the most important properties and tuning knobs in oxide heterostructures with ferromagnetism. Magnetism in low-dimensional epitaxial oxide systems has attracted continuous and considerable research attention due to the potential in spintronic memory and logic devices.. Magnetic anisotropy (MA), including lateral magnetic anisotropy (LMA) and perpendicular magnetic anisotropy (PMA), is one of the most important properties and tuning knobs in oxide heterostructures with ferromagnetism. MA can compete with other magnetic interactions and determine the ground states of these magnetic systems.. Strong PMA can cooperate with the Dzyaloshinskii–Moriya interaction and stabilize spin chiral domains and magnetic skyrmions.. The cooperation of uniaxial-LMA and interlayer exchange coupling in manganite/ ruthenate superlattices can stabilize synthetic antiferromagnets with a layer-resolved spin-flip.. Enhancing the tunability of magnetic anisotropy of oxide heterostructures should be essential for developing all-oxide-based spintronic memory and logic devices MA can compete with other magnetic interactions and determine the ground states of these magnetic systems. For instance, strong PMA can cooperate with the Dzyaloshinskii–Moriya interaction and stabilize spin chiral domains and magnetic skyrmions. In addition, the cooperation of uniaxial-LMA and interlayer exchange coupling in manganite/ ruthenate superlattices can stabilize synthetic antiferromagnets with a layer-resolved spin-flip. enhancing the tunability of magnetic anisotropy of oxide heterostructures should be essential for developing all-oxide-based spintronic memory and logic devices
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