scholarly journals The metal–insulator phase change in vanadium dioxide and its applications

2021 ◽  
Vol 129 (24) ◽  
pp. 240902
Author(s):  
Haichang Lu ◽  
Stewart Clark ◽  
Yuzheng Guo ◽  
John Robertson
Keyword(s):  
Phase Change ◽  
Vanadium Dioxide ◽  
Metal Insulator

scholarly journals Phase management in single-crystalline vanadium dioxide beams

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Run Shi ◽  
Yong Chen ◽  
Xiangbin Cai ◽  
Qing Lian ◽  
Zhuoqiong Zhang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Vanadium Dioxide ◽  
Temperature Phase ◽  
Metal Insulator ◽  
Single Crystalline ◽  
Submicron Scale ◽  
Engineering Strategy ◽  
Improved Performance ◽  
Effective Phase ◽  
Two Sides

AbstractA systematic study of various metal-insulator transition (MIT) associated phases of VO2, including metallic R phase and insulating phases (T, M1, M2), is required to uncover the physics of MIT and trigger their promising applications. Here, through an oxide inhibitor-assisted stoichiometry engineering, we show that all the insulating phases can be selectively stabilized in single-crystalline VO2 beams at room temperature. The stoichiometry engineering strategy also provides precise spatial control of the phase configurations in as-grown VO2 beams at the submicron-scale, introducing a fresh concept of phase transition route devices. For instance, the combination of different phase transition routes at the two sides of VO2 beams gives birth to a family of single-crystalline VO2 actuators with highly improved performance and functional diversity. This work provides a substantial understanding of the stoichiometry-temperature phase diagram and a stoichiometry engineering strategy for the effective phase management of VO2.

scholarly journals Spin injection into vanadium dioxide films from a typical ferromagnetic metal, across the metal–insulator transition of the vanadium dioxide films

AIP Advances ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 035120
Author(s):  
Kazuma Tamura ◽  
Teruo Kanki ◽  
Shun Shirai ◽  
Hidekazu Tanaka ◽  
Yoshio Teki ◽  
...  
Keyword(s):  
Vanadium Dioxide ◽  
Spin Injection ◽  
Ferromagnetic Metal ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator

scholarly journals Metal - Insulator Transition Driven by Vacancy Ordering in GeSbTe Phase Change Materials

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Valeria Bragaglia ◽  
Fabrizio Arciprete ◽  
Wei Zhang ◽  
Antonio Massimiliano Mio ◽  
Eugenio Zallo ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Random Access ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Insulator Transition ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Reversible Transformation ◽  
Vacancy Ordering

Abstract Phase Change Materials (PCMs) are unique compounds employed in non-volatile random access memory thanks to the rapid and reversible transformation between the amorphous and crystalline state that display large differences in electrical and optical properties. In addition to the amorphous-to-crystalline transition, experimental results on polycrystalline GeSbTe alloys (GST) films evidenced a Metal-Insulator Transition (MIT) attributed to disorder in the crystalline phase. Here we report on a fundamental advance in the fabrication of GST with out-of-plane stacking of ordered vacancy layers by means of three distinct methods: Molecular Beam Epitaxy, thermal annealing and application of femtosecond laser pulses. We assess the degree of vacancy ordering and explicitly correlate it with the MIT. We further tune the ordering in a controlled fashion attaining a large range of resistivity. Employing ordered GST might allow the realization of cells with larger programming windows.

Tuning the optical response of a dielectric grating using vanadium-dioxide as a phase-change material

2021 ◽  
Author(s):  
Muhammad Fayyaz Kashif ◽  
Tiziana Stomeo ◽  
Francesco Guido ◽  
Maria A. Vincenti ◽  
Irene Vassalini ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Vanadium Dioxide ◽  
Optical Response ◽  
Dielectric Grating ◽  
Change Material

Fast electrical and optical activation of RF switches integrating vanadium dioxide (VO2) phase change material

2021 ◽  
Author(s):  
Crunteanu Aurelian ◽  
VK Thalakkatukalathil Vinod ◽  
Orlianges Jean-Christophe ◽  
Bessaudou Annie
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Vanadium Dioxide ◽  
Rf Switches ◽  
Optical Activation ◽  
Change Material

Tunable Optical Antennas Using Vanadium Dioxide Metal-Insulator Phase Transitions

Plasmonics ◽  
2019 ◽  
Vol 14 (5) ◽  
pp. 1283-1288
Author(s):  
A. Tognazzi ◽  
A. Locatelli ◽  
M. A. Vincenti ◽  
C. Giannetti ◽  
C. De Angelis
Keyword(s):  
Phase Transitions ◽  
Vanadium Dioxide ◽  
Optical Antennas ◽  
Metal Insulator

scholarly journals Modelling the enthalpy change and transition temperature dependence of the metal–insulator transition in pure and doped vanadium dioxide

2020 ◽  
Vol 22 (24) ◽  
pp. 13474-13478
Author(s):  
Haichang Lu ◽  
Stewart Clark ◽  
Yuzheng Guo ◽  
John Robertson
Keyword(s):  
Transition Temperature ◽  
Temperature Dependence ◽  
Spin Density ◽  
Latent Heat ◽  
Vanadium Dioxide ◽  
Enthalpy Change ◽  
Formula Unit ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Enthalpy Difference

We show that a non-collinear spin density GGA+U functional calculation can describe the enthalpy difference (latent heat) of ΔE0 = −44.2 meV per formula unit, similar to the experimental value, between the paramagnetic rutile and the M1 phases of VO2.

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