Simultaneous control of multiple ferromagnetic materials 'ferroelectricity and ferromagnetism'
- 성균융합원
- Hit2611
- 2018-04-09
The Korea Research Foundation (KFRI) announced on the 8th that the research team of Gwangju Institute of Science and Technology and Professor Kim Sung-gyun of the Sungkyunkwan University research team identified the principle of ferroelectricity and ferromagnetism at the same time.
Multiple stiffness refers to a property having both ferroelectric and ferromagnetic properties.
Ferroelectric materials that form the electric field are used in computer memory chips, capacitors, and the like. In the case of magnetic ferromagnetic materials, it is mainly used for ahrd disk magnetic heads and electric appliances motors.
Now it is not easy to control both properties at the same time. The team has artificially controlled the oxygen atom position of the bismuth cetylsulphide film, which is a multi-stiff material, and has exceeded its limit. In addition, by developing high-quality thin film manufacturing technology, we have increased the thickness of thin film that can control oxygen atom position by more than 10 times. As a result, the ferroelectricity and ferromagnetic properties have improved by more than two times compared to conventional devices, the researchers said.
Prof. Jo said, "Until now, it was possible to control the position of oxygen atoms only in the interface area of less than a few nanometers. It was difficult to measure ferroelectricity and ferromagneticity." she said.
Tae Young Choi of Pohang Accelerator Research Institute, prof. Yoon Seok Kim, prof. Byung Ki Jo of Gwangju Institute of Science and Technology, and prof. Junhee Lee of Ulsan Institute of Science and Technology are supported research.
The paper on the achievements was published on the cover of Advanced Funtional Materials on 26th of last month.