Superconducting diode effect

#dynamics#spintronics #magnetic-materials

Biography

Teruo Ono received the B.S., M.S., and D.Sc. degrees from Kyoto University in 1991, 1993, and 1996, respectively. After a one year stay as a postdoctoral associate at Kyoto University, he moved to Keio University where he became an assistant professor. In 2000, he moved to Osaka University where he became a lecturer and an associate professor. Since 2004, he has been working at Kyoto University, where he is now a professor. He has published over 280 technical articles in peer-reviewed journals, including book chapters and review articles, and has given more than 90 invited presentations at international conferences. He served as conference co-chair of the 8th International Symposium on Metallic Multilayers (MML) in 2013, and on the program committees of various international conferences on magnetism and spintronics.

Abstract

We found the superconducting diode effect (SDE) in Nb/V/Ta superlattices with a polar structure, which is the ultimate

diode effect exhibiting a superconducting state in one direction and a normal state in the other [1-3]. The SDE can be

considered as the nonreciprocity of the critical current for the metal-superconductor transition. We have also found the

reverse effect, i.e., the nonreciprocal critical magnetic field under the application of supercurrent [4]. We also found that

the polarity of the superconducting diode shows a sign reversal when the magnetic field is increased [5]. Recently, we

have succeeded in demonstrating zero-field SDE by introducing ferromagnetic layers into superlattices [8, 9]. The polarity

of the SDE is controlled by the magnetization direction of the ferromagnetic layer, leading to the development of novel

non-volatile memories and logic circuits with ultra-low power consumption.

This work was partly supported by JSPS KAKENHI Grant Numbers (18H04225, 18H01178, 18H05227, 20H05665,

20H05159, 21K18145), MEXT Initiative to Establish Next-generation Novel Integrated Circuits Centers (X-NICS) Grant

Number JPJ011438, the Cooperative Research Project Program of the Research Institute of Electrical Communication,

Tohoku University, and the Collaborative Research Program of the Institute for Chemical Research, Kyoto University.

References

[1] F. Ando et al., J. Magn. Soc. Japan 43, 17 (2019).

[2] F. Ando et al., Nature 584, 373 (2020).

[3] F. Ando et al., Jpn. J. Appl. Phys. 60, 060902 (2021).

[4] Y. Miyasaka et al., Appl. Phys. Express 14, 073003 (2021).

[5] R. Kawarazaki et. al., Appl. Phys. Express 15 113001 (2022)

[6] H. Narita et al., Nat. Nanotechnol. 17, 823 (2022).

[7] H. Narita et al., Adv. Mater., 10.1002/adma.202304083.

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