Extraordinary Hall resistance and unconventional magnetoresistance in Pt/LaCoO3 hybrids

Abstract

We report an investigation of transverse Hall resistance and longitudinal resistance on Pt thin films sputtered on epitaxial LaCoO${}_3$ (LCO) ferromagnetic insulator films. The LaCoO${}_3$ films were deposited on several single crystalline substrates [LaAlO${}_3$ (LAO), (La,Sr)(Al,Ta)O${}_3$ (LSAT), and SrTiO${}_3$ (STO)] with (001) orientation. The physical properties of LaCoO${}_3$ films were characterized by the measurements of magnetic and transport properties. The LaCoO${}_3$ films undergo a paramagnetic to ferromagnetic (FM) transition at Curie temperatures ranging from 40 K to 85 K, below which the Pt/LCO hybrids exhibit significant extraordinary Hall resistance (EHR) up to 50 m$\Omega$ and unconventional magnetoresistance (UCMR) ratio $\Delta$$\rho$/${\rho }_0$ about $1.2\times 10^{-4}$, accompanied by the conventional magnetoresistance (CMR). The observed spin transport properties share some common features as well as some unique characteristics when compared with well-studied Y${}_3$Fe${}_5$O${}_{12}$-based Pt thin films. Our findings call for new theories since the extraordinary Hall resistance and magnetoresistance cannot be consistently explained by the existing theories.

arXiv comment9 pages, 11 figures, accepted by Physical Review B

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Cited by in corpus (4)

• Theory of spin Hall magnetoresistance (SMR) and related phenomena
• Pure spin-Hall magnetoresistance in Rh/Y3Fe5O12 hybrid
• Spin-Hall magnetoresistance in a low-dimensional magnetic insulator
• Investigation of anomalous-Hall and spin-Hall effects of antiferromagnetic IrMn sandwiched by Pt and YIG layers