Research from a team led by
VO2 is currently used to make infrared sensors. By integrating VO2 as a single crystal onto a silicon substrate, the researchers have made it possible to create infrared smart sensors, in which the sensor and computational function are embedded on a single chip. This makes the sensor faster and more energy efficient, since it doesn't have to send data to another chip to be processed. Smart sensors are also lighter than conventional ones, since separate chips aren't necessary.
"For military applications, sensor technology needs to be able to sense, manipulate, and respond to data quickly - and this work achieves that," says Dr.
In addition, the researchers used high-power nanosecond-pulsed laser beams to modify the VO2 and make it magnetic. This will allow the creation of spintronic smart sensors that incorporate infrared sensors and magnetic sensors on a single chip. Spintronics refers to technologies used in solid-state devices that take advantage of the inherent spin in electrons and their related magnetic momentum. The potential advantages of spintronics include higher memory capacity, faster data transfer and more computational power on a computer chip.
The paper, "Diamagnetic to ferromagnetic switching in VO2 epitaxial thin films by nanosecond excimer laser treatment," is published online in Applied Physics Letters. Lead author of the paper is
Note to Editors: The study abstracts follow.
"Diamagnetic to ferromagnetic switching in VO2 epitaxial thin films by nanosecond excimer laser treatment"
Abstract: VO2(010)/NiO(111) epitaxial heterostructures were integrated with Si(100) substrates using a cubic yttria-stabilized zirconia (c-YSZ) buffer. The epitaxial alignment across the interfaces was determined to be VO2(010)aEuros-NiO(111)aEuros-c-YSZ(001)aEuros-Si(001) and VO2aEuros-NiO(110)aEuros-c-YSZ(100)aEuros-Si(100). The samples were subsequently treated by a single shot of a nanosecond KrF excimer laser. Pristine as-deposited film showed diamagnetic behavior, while laser annealed sample exhibited ferromagnetic behavior. The population of majority charge carriers (e-) and electrical conductivity increased by about two orders of magnitude following laser annealing. These observations are attributed to the introduction of oxygen vacancies into the VO2 thin films and the formation of V3+ defects.
TNS 30TagarumaMar-140207-4629997 30TagarumaMar
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