Recently, the processing platform of Suzhou Institute of Nanotechnology and Nanobionics, Chinese Academy of Sciences has cooperated with foreign research institutions such as the University of California, Los Angeles to develop a new type of nano-oscillator based on the magnetoresistance effect.

An oscillator is an electronic component that converts a DC signal into an AC signal with a certain frequency. It is widely used in the electronics industry, medical treatment, and scientific research. In recent years, with the rapid development of mobile communications and satellite communications, the requirements for miniaturization and integration of oscillator devices have become increasingly urgent. At the same time, mobile communications are also developing towards high frequencies and widebands. The current commercial LC oscillators are large (in the order of micrometers) and low in frequency (eg GPS: 1.6 GHz; GSM: 850 MHz; WCDMA: 2 GHz), and The frequency adjustment range is small (<20%). Therefore, finding new materials and devices with good high-frequency characteristics, wide-band tunability, and easy miniaturization and integration is an important goal of current research and development, and market demand is also very strong.

The volume of the new nano-oscillator is only 1/50 of the traditional oscillator, and the adjustable range of the operating frequency can reach 80%. The researchers optimized the performance of the device by precisely controlling the interface of the nanomagnetic film: CoFeB around 1.6 nm formed on the MgO insulating layer at 0.8 nm will cause the magnetization direction of the CoFeB magnetic layer to be perpendicular to the film surface, that is, to the fixed layer ) The magnetization directions are arranged at 90 degrees. This structure realizes the microwave signal output without external magnetic field, thereby solving the problem of the need to increase the magnetic field device, simplifying the device structure; and greatly reducing the drive current density (<5.4 × 105A / cm2), thereby reducing power consumption , Is conducive to multi-functional integration with semiconductor technology.

The researchers said that despite the significant progress made in the research of this oscillator, the line width and power of the device still need to be further improved to meet the requirements of practical wireless communication applications.

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