Research groups such as Hokkaido University have discovered a new phenomenon, the "reverse magnetic capacitance (iTMC) effect."This is the reverse phenomenon of the magnetic capacitance (TMC) effect, which has been widely known for a long time, and was discovered for the first time in the world.

 The TMC effect is the capacitance (electrical capacitance) when the magnetization (direction of properties as a magnet) of the magnetic layers is parallel to each other in a junction in which a thin insulating layer is sandwiched between two magnetic layers (magnetic layers). A phenomenon in which the amount of electricity accumulated) becomes "large" and "small" when it is antiparallel.This time, the research group challenged the development of an unprecedented junction structure by combining iron and iron oxide, and the opposite phenomenon, that is, when the magnetization of the magnetic layer is parallel, the capacitance is "small", and when it is antiparallel. Succeeded in the manifestation of the "growth" phenomenon.

 In addition, this mechanism has been elucidated by the charge storage theory incorporating quantum mechanics, and according to the theoretical calculation, the rate of change in capacitance (iTMC ratio) was obtained this time in the structure using iron nitride and cobalt iron boron alloy. It is said to be about 10 times larger than the value for iron.

 If research on the iTMC effect is widely expanded with the results of this research as a starting point, the path to the birth of high-sensitivity, low-power consumption magnetic sensors and memories will be opened up along with the improvement of the iTMC ratio.In the future, it is expected to be applied to position detection sensor elements such as magnetic card readers and GPS, and non-volatile memory for mounting on personal computers and smartphones.

Paper information: [Scientific Reports]: Inverse Tunnel Magnetocapacitance in Fe / Al-oxide / Fe3O4

Tohoku University

Create excellent research results that will be the source of innovation, and develop talented human resources who will lead the next generation

Tohoku University has a rich culture and humanity based on the tradition of "research first principle" since its opening, the idea of ​​"opening the door" and the spirit of "respect for practical science", and is a phenomenon of human beings, society and nature. In response to this, human resources with the ability to carry out intellectual exploration with a "scientific mind", demonstrating their expertise in various fields from an international perspective and leading […]

Hokkaido University

Strong cooperation with industry and regions "Practical science unique to Hokkaido University" leads the world

The origin of Hokkaido University dates back to Sapporo Agricultural College, which was established in 1876.Throughout its long history, we have cultivated the basic principles of "frontier spirit," "cultivating internationality," "education for all," and "emphasis on practical studies."Based on this philosophy, he has a high level of academic background that is internationally accepted, and has accurate judgment and a leader […].

University Journal Online Editorial Department

This is the online editorial department of the university journal.
Articles are written by editorial staff who have a high level of knowledge and interest in universities and education.