Multifilamentary Character of Anticorrelated Capacitive and Resistive Switching in Memristive Structures Based on (Co -Fe -B )x(LiNb O 3)100-x Nanocomposite
Abstract
Resistive and capacitive switching in capacitor metal/nanocomposite/metal (M /NC /M ) structures based on (Co -Fe -B )x(LiNb O 3)100-x NC fabricated by ion-beam sputtering with metal content x ≈ 8-20 at. % is studied. The peculiarity of the structure synthesis was the use of increased oxygen content (approximately equal to 2 × 10-5 Torr) at the initial stage of the NC growth. The NC films, along with metal nanogranules of 3-6 nm in size, contained a large number of dispersed Co (Fe) atoms (up to approximately 1022 cm-3). Measurements are performed both in dc and ac (frequency range 5-13 MHz) regimes. When switching structures from high-resistance (Roff) to low-resistance (Ron) state, the effect of a strong increase in their capacity is found, which reaches 8 times at x ≈ 15 at. % and the resistance ratio Roff:Ron ≈ 40. The effect is explained by the synergetic combination of the multifilamentary character of resistive switching (RS) and structural features of the samples associated, in particular, with the formation of a high-resistance and strongly polarizable LiNb O 3 layer near the bottom electrode of the structures. The proposed model is confirmed by investigations of RS of two-layer nanoscale M /NC /LiNb O 3/M structures as well as by studies of the magnetization of M /NC /M structures in the pristine state and after RS.
- Publication:
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Physical Review Applied
- Pub Date:
- September 2020
- DOI:
- 10.1103/PhysRevApplied.14.034016
- arXiv:
- arXiv:1912.03726
- Bibcode:
- 2020PhRvP..14c4016M
- Keywords:
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- Condensed Matter - Mesoscale and Nanoscale Physics
- E-Print:
- Phys. Rev. Applied 14, 034016 (2020)