Abstract
Complex ferromagnetic oxides have been identified as possible candidate materials for sources of spin currents. Here we study bilayers of ferromagnetic (La2/3Sr1/3)MnO3 (LSMO) and metallic CaRuO3 (CRO) on LSAT substrates as a model system for spin pumping. Ferromagnetic resonance (FMR) measurements of these bilayers show evidence of spin pumping across the interface in the form of an increase in Gilbert damping with the addition of CRO. FMR indicates that the presence of CRO modifies the magnetic anisotropy of the LSMO. By increasing CRO thickness, we find a reduction of the out-of-plane anisotropy and simultaneous rotation of the easy axis within the plane, from the ⟨110⟩ to ⟨100⟩ axis. The evolution of magnetic anisotropy determined by FMR disagrees with that measured by bulk SQUID magnetometry and is accompanied by structural distortions in the LSMO layer as measured by x-ray diffraction, thus suggesting a change in magnetic anisotropy attributed to structural distortions imposed on LSMO by CRO. These results suggest that while LSMO and CRO remain promising candidates for efficient pure spin current generation and detection, respectively, epitaxial integration of perovskites will cause additional changes which must be accounted for in spintronics applications.
Highlights
Scitation.org/journal/adv reducing the effects of strain at the coherent interfaces
We study spin pumping in LSMO/CRO bilayers of varying CRO thickness grown on LSAT substrates, using ferromagnetic resonance (FMR) to generate spin currents and probe magnetism
We find that the magnetic anisotropy of the LSMO reverses sign with increasing CRO layer thickness, indicating that the CRO overlayer modifies the underlying LSMO
Summary
Scitation.org/journal/adv reducing the effects of strain at the coherent interfaces. The smaller Ca ions, compared to Sr, cause significant distortions to the perovskite crystal structure, changing the orbital overlap, density of states, and exchange interactions within the material.11 The absence of long range magnetic order in CRO should reduce the effects of proximity-induced magnetism at the interfaces. We study spin pumping in LSMO/CRO bilayers of varying CRO thickness grown on LSAT substrates, using FMR to generate spin currents and probe magnetism.
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