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Press Releases

DATE2024.10.24 #Press Releases

Success in Determining Bit Error Rate of Racetrack Memory

—— Established an evaluation method to determine the error rate of bit operations——

Summary

A research group led by Mio Ishibashi, a specially-appointed researcher at the School of Science, the University of Tokyo (at the time of the research, currently Assistant Professor at the Advanced Institute for Materials Research, Tohoku University), Professor Satoru Nakatsuji, and Associate Professor Masamitsu Hayashi, together with a research team led by team leader Kay Yakushiji at the National Institute of Advanced Industrial Science and Technology (AIST) (at the time of the research, currently Principal Research Manager at the AIST)  and Professor Arata Tsukamoto at the Department of Electronics, Nihon University College of Science and Technology, have established a method for determining the error rate of bit manipulation of digital information, a key performance indicator of racetrack memory. In the research and development of “Racetrack memory,” which is expected to be put to practical use as a next-generation magnetic memory in the storage class, there have been many reports demonstrating write and read operations of digital information, but no approach has been established to investigate the reliability of memory operation. This study established a new performance evaluation method to determine the error rate of bit operations. The bit position control using nanosecond current pulses in a ferrimagnetic thin wire-based racetrack memory was repeated multiple times to determined the bit error rate from the bit position variation. It was found that when the current pulse used for bit position manipulation is sufficiently large, there is no correlation between the bit error rates of successive operations. These results provide a positive perspective on the development of racetrack memory.

Figure:Schematic diagram of the recording medium of a racetrack memory. The red (blue) colored regions represent magnetic domains with magnetization facing in opposite directions, respectively, recording 0s and 1s as information. When a current pulse is applied to the thin wire, the red and blue areas move in the same direction as the current. The length of the current pulse controls the amount of movement.

Journals

Journal Science Advances
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