Large magnetocapacitance effect in magnetic tunnel junctions based on Debye-Frohlich model

Kaiju, Hideo; Takei, Masashi; Misawa, Takahiro; Nagahama, Taro; Nishii, Junji; Xiao, Gang

Large magnetocapacitance effect in magnetic tunnel junctions based on Debye-Frohlich model

Kaiju, Hideo; Takei, Masashi; Misawa, Takahiro et al.

Applied physics letters, 2015, 107(13), 132405-1-132405-5

Permalink : https://hdl.handle.net/2115/60214

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アクセス権	open access
URI	https://hdl.handle.net/2115/60214
タイトル	Large magnetocapacitance effect in magnetic tunnel junctions based on Debye-Frohlich model
著者	Kaiju, Hideo ; Takei, Masashi ; Misawa, Takahiro ; Nagahama, Taro ; Nishii, Junji ; Xiao, Gang
e-Rad_Researcher 70396323 著者名 Kaiju, Hideo
著者名 Takei, Masashi
著者名 Misawa, Takahiro
e-Rad_Researcher 20357651 著者名 Nagahama, Taro
e-Rad_Researcher 60357697 著者名 Nishii, Junji
著者名 Xiao, Gang
言語	英語
発行日	2015-09-28
出版者	American Institute of Physics (AIP)
収録物名	Applied physics letters
巻(号)	107(13)
ページ	132405-1-132405-5
抄録	The frequency dependence of tunneling magnetocapacitance (TMC) in magnetic tunnel junctions (MTJs) is investigated theoretically and experimentally. According to the calculation based on Debye-Frohlich model combined with Julliere formula, the TMC ratio strongly depends on the frequency and it has the maximum peak at a specific frequency. The calculated frequency dependence of TMC is in good agreement with the experimental results obtained in MgO-based MTJs with a tunneling magnetoresistance (TMR) ratio of 108%, which exhibit a large TMC ratio of 155% at room temperature. This calculation also predicts that the TMC ratio can be as large as about 1000% for a spin polarization of 87%, while the TMR ratio is 623% for the same spin polarization. These theoretical and experimental findings provide a deeper understanding on AC spin-dependent transport in the MTJs and will open up wider opportunities for device applications, such as highly sensitive magnetic sensors and impedance-tunable devices.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Copyright 2015 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Appl. Phys. Lett. 107, 132405, 2015, and may be found at http://dx.doi.org/10.1063/1.4932093
PISSN	0003-6951
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1063/1.4932093