The latest research by Japanese researchers has found that when platinum is made into an ultra-thin film only 2 nanometers thick, it can have characteristics similar to semiconductors such as silicon. The researchers believe that this discovery challenges the traditional understanding of semiconductor materials and helps promote the development of related fields.
Traditionally, metals and semiconductors are strictly distinguished. Metals generally have good conductivity, while semiconductors are between insulators and conductors, and conductivity can be controlled. Transistors made of common semiconductor materials such as silicon are widely used in various electronic devices.
The research team at Kyoto University found that when a heavy metal platinum is made into an ultra-thin film with a thickness of only 2 nanometers on a magnetic insulator called "yttrium iron garnet", it can control resistance by an external voltage like a semiconductor.
In addition, the researchers also found that platinum can greatly adjust and control the "spin-orbit coupling" effect. Spin-orbit coupling refers to the interaction between particle spin and orbital motion, and plays a key role in spintronics research. Research on semiconductors or other new materials often involves this effect.
According to the research team, this finding is inconsistent with the traditional knowledge of solid physics and will help the development of electronics and spintronics. The results of this research have been published in the new issue of the British journal Nature. (Reporter Hua Yi)
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