Memory-functionality superconductor/ferromagnet/superconductor junctions based on the high- Tc cuprate superconductors YBa2Cu3O7−x and the colossal magnetoresistive manganite ferromagnets La2/3X1/3MnO3+δ(X=Ca,Sr)
Year: 2019
Type: article
Abstract: Complex oxides exhibit a variety of unusual physical properties, which can be used for designing novel electronic devices. Here we fabricate and study experimentally nanoscale superconductor/ferromagnet/ superconductor junctions with the high-${T}_{c}$ cuprate superconductors ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}x}$ and the colossal magnetoresistive (CMR) manganite ferromagnets ${\mathrm{La}}_{2/3}{X}_{1/3}{\mathrm{MnO}}_{3+\ensuremath{\delta}}(X=\mathrm{Ca}\text{or}\mathrm{Sr})$. We demonstrate that in a broad temperature range the magnetization of a manganite nanoparticle, forming the junction interface, switches abruptly in a monodomain manner. The CMR phenomenon translates the magnetization loop into a hysteretic magnetoresistance loop. The latter facilitates a memory functionality of such a junction with just a single CMR ferromagnetic layer. The orientation of the magnetization (stored information) can be read out by simply measuring the junction resistance in a finite magnetic field. The CMR facilitates a large readout signal in a small applied field. We argue that such a simple single-layer CMR junction can operate as a memory cell both in the superconducting state at cryogenic temperatures and in the normal state up to room temperature.
Language: Latvian
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
Awards: G2911324950, G3672170285
OpenAlex ID: W2933658157