S
Sunao Aya
Researcher at Mitsubishi Electric
Publications - 33
Citations - 320
Sunao Aya is an academic researcher from Mitsubishi Electric. The author has contributed to research in topics: Resist & Lithography. The author has an hindex of 11, co-authored 33 publications receiving 315 citations. Previous affiliations of Sunao Aya include Mitsubishi Corporation.
Papers
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Journal ArticleDOI
Sub-hundred nanometre pitch measurements using an AFM with differential laser interferometers for designing usable lateral scales
Ichiko Misumi,Satoshi Gonda,Qiangxian Huang,Taeho Keem,Tomizo Kurosawa,Akihiro Fujii,Nahoko Hisata,Takeshi Yamagishi,Hirohisa Fujimoto,Ken Enjoji,Sunao Aya,Hiroaki Sumitani +11 more
TL;DR: In this paper, the authors developed a new atomic force microscope with differential laser interferometers (DLI-AFM), carried out test measurements of the prototype 1D-grating standards with pitches of 100, 80, 60 and 50 nm using the DLI-AAFM and evaluated the uncertainty in the pitch measurements.
Journal ArticleDOI
Magnetization chirality due to asymmetrical structure in Ni-Fe annular dots for high-density memory cells
Ryoichi Nakatani,Tetsuo Yoshida,Yasushi Endo,Yoshio Kawamura,Masahiko Yamamoto,Takashi Takenaga,Sunao Aya,Takeharu Kuroiwa,Sadeh Beysen,Hiroshi Kobayashi +9 more
TL;DR: In this paper, Ni-Fe asymmetric ring dots with partially planed outer sides were investigated as candidates for high-density magnetic memory cells, and the magnetic states were measured with magnetic force microscopy.
Journal ArticleDOI
Validity of double and triple Gaussian functions for proximity effect correction in X-ray mask writing
TL;DR: In this paper, an improved function was proposed to express the deposited energy intensity distribution for fine patterns or that for heavy metals such as X-ray absorbers, and an experimental method was also proposed for obtaining the function parameters, and the optimal parameters were obtained for Si and W-Ti substrates at acceleration voltage of 25 kV.
Journal ArticleDOI
Magnetically pinned ring dots for spin valve or magnetic tunnel junction memory cells
Ryoichi Nakatani,Tetsuo Yoshida,Yasushi Endo,Yoshio Kawamura,Masahiko Yamamoto,Takashi Takenaga,Sunao Aya,Takeharu Kuroiwa,Sadeh Beysen,Hiroshi Kobayashi +9 more
TL;DR: In this paper, the Ni-Fe/Mn-Ir asymmetric ring dots with partially planed outer sides are investigated in order to confirm a method for obtaining pinned layers in magnetic memories with asymmetric round shapes.
Patent
Semiconductor device and method for manufacturing semiconductor device
Shiro Hino,Naruhisa Miura,Akihiko Furukawa,Yukiyasu Nakao,Tomokatsu Watanabe,Masayoshi Tarutani,Yuji Ebiike,Masayuki Imaizumi,Sunao Aya +8 more
TL;DR: In this article, a semiconductor device capable of suppressing time variation of a threshold voltage and a method of manufacturing the same is presented, which comprises a drift layer formed on a polysilicon substrate, first well regions formed in a surface layer of the drift layer, being apart from one another, a gate insulating film formed, extending on the drift layers and each of the first well region, a gated electrode selectively formed on the gate's surface, a source contact hole penetrating through the gate-insulating film and reaching the inside of each well regions, and a residual