成果報告書詳細
管理番号20100000001230
タイトル*平成21年度中間年報 省エネルギー革新技術開発事業/挑戦研究/チップ間信号伝送用マイクロ波発振素子の開発
公開日2010/9/9
報告書年度2009 - 2009
委託先名国立大学法人東北大学 独立行政法人産業技術総合研究所
プロジェクト番号P09015
部署名省エネルギー技術開発部
和文要約和文要約等以下本編抜粋:1. 研究開発の内容及び成果等 本挑戦研究では、最終的にはシステムインパッケージ(3次元実装、3次元集積)を実現するための「簡素で高効率かつ低消費電力な真の無線通信技術」を確立するため、スピン注入自励発振・共鳴型である微小磁性体を用いた新規なマイクロ波発振器の研究開発を行う。実用化までのマイルストーンとしては、図1に示すような開発ステップを想定しており、本挑戦研究では、微小磁性体を用いた新規なマイクロ波発振素子の高出力化・高Q化(1μW級、Q値≧1000)、フェーズロック機構の開発(10μW超級高出力化設計)、低消費電力無線信号伝送の検証などの基礎技術の開発を行い、実現可能性を検証する。続く先導研究では受信機構の開発、送受信デバイスの試作開発、超小型・高効率信号伝送技術の開発などプロトタイピングを完了し、2015年-2017年の実用化研究(製造技術)、2018年-2020年の実用化開発(製品開発)へと展開、2020年以降の低消費電力SiP製品のLSI市場への投入を目指す。本挑戦研究は、究極の無線インターコネクト技術の開発の第1ステップであり、可能性を検証する重要なフェーズと位置づけている。
英文要約 To realize "More Than Moore Technology", the digital communication techniques with high speed and low power consumption, enabling higher interconnectivity between circuit components such as integration of new generation of System-in Package (SiP), are highly requested in the Silicon 3D-Integration Technology field. In sight of this background, the purpose of this project is to develop a breakthrough technique for the wireless interconnection between chips by using of "Spin-Torque Oscillator (STO) and Receiver".
"Nano-Constriction Structured Spin Transportation Systems" such as Nano-Contact magnetoresistive devices (NCNR) with "Nano-Confined Domain Wall" is
regarded as one of the most promising next-generation "Spin-Torque Oscillator and Receiver" that could enable the realization of future communication with high speed and low power consumption between chips.
However, in the Nano-Constriction Structured Spin Transportation System, a novel structure consisting of nanometer-sized constricted dots/channels as well as a new physical scheme for electron/spin transportation should be devised. In this research project, a strong collaboration between two groups of Tohoku University and National Institute of Advanced Industrial Science with specialties in material science, device physics, characterization/simulation and evaluation/analysis will promote an establishment of a -1μW of output power with Q value (f/Δf)≧1000 of STO device. The final target of output power is set to -10μW by using a phase locking technology for the development of the Nano-Constriction Structured "STO and Receiver" for high speed and low consumption-power communication techniques.
In this year, we have succeeded in confirming more than 25% of MR ratio with areal resistance of 0.5Ωμm^2 in self-assembling NCMR devices with "Nano-Confined Domain Wall". Further, we have developed B2 ordered Fe50Co50 alloy film which shows highest bulk and interface spin asymmetry coefficient, β-0.81 and γ-0.80 at room temperature.
NCMR devices with B2 ordered Fe50Co50 film is expected to reach the target value of MR ratio of 50% (areal resistance 0.5Ωμm^2). Still more, several unique characteristic microwave oscillations were observed in the NCMR elements with a spin-valve structure. Especially, we have find that the clear microwave is generated in the specific angle (-140°) between fee and
pinned layer magnetizations. Our result qualitatively agrees with the results from the simulation of geometrically confined domain wall by AIST group. From the results, it is confirmed that the coherent oscillation in NCMR SV element originates from the geometrically nano-confined DW.
AIST group developed the micro-magnetics simulation program using the FFTW and OpenMP. The program is especially tuned for the parallel-computer system, "ultra-compact microwave oscillator device analysis system," which have been purchased this year.
We also confirmed that execution with 8 CPU cores is about 5 times faster than that with a single core. We performed the simulation for current induced dynamics of a geometrically confined domain wall and found that the oscillation frequency strongly depends on the direction of the current. When the current is positive, i.e., the current flows from the free layer to the fixed layer, the domain wall penetrates to the free layer and the oscillation frequency decreases. The oscillation frequency for J=+107A/cm2 is 22GHz, which is 0.24 times of that for J=-107A/cm2 (93GHz).The simulation of current induced dynamics for 4ns period takes 53 hours, that is 13.3 hours for 1ns period. The developed program is so fast that we can simulate the dynamics of multi contact system, where the phase lock occurs.
In the next year we shall study the mechanism of the phase-lock using the developed simulation program.
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