Interface-driven enhancement of magnetic anisotropy in infinite-layer cuprate/manganite heterostructures
Digbijaya Palai, B. Samantaray, Poonam Sharma, D. Sahoo, Kishori Lal, S. Kale, G. Tripathy, R. Soni, Nirmal Ganguli, Z. Hossain, D. Samal
DOI 10.1103/c6hy-pfxy · Physical Review B
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Abstract
Interfacial symmetry breaking leading to the preferential orbital occupation in complex oxide heterostructures offer effective routes to tailor magnetic anisotropy. We demonstrate the modulation of magnetic anisotropy in La0.7Sr0.3MnO3 (LSMO) thin films interfaced with the infinite-layer cuprate SrCuO2 (SCO). Static magnetization measurements show a pronounced in-plane magnetic anisotropy in LSMO/SCO bilayers compared to bare LSMO films, consistent with shifts in the resonance field as a function of the angle in ferromagnetic resonance measurements. In addition, a more than two-fold increase in the Gilbert damping is observed across all LSMO/SCO bilayers relative to the bare LSMO films, further supporting the interfacial modification of magnetic anisotropy and magnetization dynamics. However, inserting a thin SrTiO3 (STO) spacer in the control LSMO/STO/SCO sample exhibits the magnetic response similar to that of bare LSMO. This underscores the key role of the LSMO/SCO interface in the observed enhanced magnetic anisotropy. First-principles density functional theory calculations reveal a relatively larger occupation of the 3dx2−y2 orbital near the Fermi level in LSMO/SCO, accounting for the enhanced in-plane magnetic anisotropy, while ruling out the possibility of Rashba field-induced change in magnetic anisotropy. This work provides a comprehensive understanding of enhanced in-plane magnetic anisotropy and magnetization dynamics in the nonisostructural LSMO/SCO heterostructure.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| SrCuO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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