Publications by authors named "J MacManus-Driscoll"
The discovery of ferroelectric phases in HfO-based films has reignited interest in ferroelectrics and their application in resistive switching (RS) devices. This study investigates the pivotal role of electrodes in facilitating the Schottky-to-Ohmic transition (SOT) observed in devices consisting of ultrathin epitaxial ferroelectric HfYO (YHO) films deposited on LaSrMnO-buffered Nb-doped SrTiO (NbSTO|LSMO) with Ti|Au top electrodes. These findings indicate combined filamentary RS and ferroelectric switching occurs in devices with designed electrodes, having an ON/OFF ratio of over 100 during about 10 cycles.
View Article and Find Full Text PDFThis prospective and performance summary provides a view on the state of the art of emerging non-volatile memory (eNVM) in the semiconductor industry. The overarching aim is to inform academic researchers of the status of these technologies in industry, so as to help direct the right academic research questions for future materials and device development. eNVM already have a strong foothold in the semiconductor industry with the main target of replacing embedded flash memory, and soon possibly DRAM and SRAM, i.
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- - The study focuses on vertically aligned nanocomposite (VAN) thin films as a promising solution for enhancing solid oxide fuel cell (SOFC) cathodes, integrating conventional materials like LSCF and LSM with highly ionic conducting materials such as YSZ or doped CeO.
- - The research highlights the development of a new type of VAN cathode featuring La-doped BiO (LDBO) columns embedded in an LSM matrix, expected to significantly improve performance due to the high ionic conductivity of BiO-based materials.
- - Results indicate that the new BiO-based VAN cathodes demonstrate substantially lower area specific resistance (ASR) than planar LSM, marking a three orders of magnitude improvement, thus
Article Synopsis
- Piezoresponse force microscopy (PFM) is a powerful technique for studying ferroelectric materials at a nanoscale but can produce misleading signals due to electrostatic interactions.
- The study introduces a calibration process and a method to identify the parasitic phase offset, enhancing the accuracy of the phase-amplitude loops.
- The techniques combine switching spectroscopy-PFM (SS-PFM) and Kelvin probe force microscopy (KPFM) to quantify local imprint voltages in various materials, revealing the significance of correct read voltage selection and allowing detailed mapping of imprint voltage variations in BaTiO single crystals.
The discovery of ferroelectricity in nanoscale hafnia-based oxide films has spurred interest in understanding their emergent properties. Investigation focuses on the size-dependent polarization behavior, which is sensitive to content and movement of oxygen vacancies. Though polarization switching and electrochemical reactions is shown to co-occur, their relationship remains unclear.
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