[9a-N303-1~9] 10.3 Spin devices, magnetic memories and storages

9:00 AM - 9:15 AM JST(12:00 AM - 12:15 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation AwardEnglish Presentation

[9a-N303-1] Ferromagnetic resonance in Magnetic Tunnel Junction with Pseudo Spin Valve Structure for Energy Harvesting

〇(M2)Kazunari Kino^1,2, Takaaki Dohi¹, Harumi Chiku^1,2, Takanobu Shinoda^1,2, Shun Kanai^{1,2,3,4,5,6,7}, Hideo Ohno^1,3,4,8, Shunsuke Fukami^1,2,3,4,8,9 (1.RIEC, Tohoku Univ, 2.Tohoku Univ., 3.WPI-AIMR, Tohoku Univ., 4.CSIS, Tohoku Univ., 5.PRESTO, JST, 6.DEFS, Tohoku Univ., 7.QST, 8.CIES, Tohoku Univ., 9.InaRIS)

Keywords:

Spintronics,Magnetic Tunnel Junction,Energy Harvesting

Establishing energy harvesting technologies from ambient wireless signals holds a potential for achieving a low carbon emission society. Toward this end, magnetic tunnel junctions (MTJs) have been used to demonstrate the energy harvesting from a 2.4 GHz WiFi band wireless signal. For practical applications, however, improving the conversion efficiency from rf input to dc output is required. For this purpose, this study employs MTJs with a pseudo-spin-valve (PSV) structure. Compared with the spin-valve (SV) MTJs used in the previous work, the PSV structure has been reported to show higher tunneling magnetoresistance (TMR), showing promise for higher conversion efficiency. We find that the PSV MTJs exhibit significantly higher sensitivity, which can be attributed to the higher TMR ratio. This work provides a route for improving the conversion efficiency for wireless signals energy harvesting applications.