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

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Title: Large magnetocapacitance effect in magnetic tunnel junctions based on Debye-Frohlich model
Authors: Kaiju, Hideo Browse this author →KAKEN DB
Takei, Masashi Browse this author
Misawa, Takahiro Browse this author
Nagahama, Taro Browse this author →KAKEN DB
Nishii, Junji Browse this author →KAKEN DB
Xiao, Gang Browse this author
Issue Date: 28-Sep-2015
Publisher: American Institute of Physics (AIP)
Journal Title: Applied physics letters
Volume: 107
Issue: 13
Start Page: 132405-1
End Page: 132405-5
Publisher DOI: 10.1063/1.4932093
Abstract: 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.
Rights: 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
Type: article
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 海住 英生

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