2006 Fiscal Year Final Research Report Summary
Ultra-High Density Magnetic Memory Cells
| Project/Area Number |
14102029
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| Research Category |
Grant-in-Aid for Scientific Research (S)
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| Allocation Type | Single-year Grants |
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| Research Field |
Physical properties of metals
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| Research Institution | Osaka University |
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Principal Investigator |
YAMAMOTO Masahiko Osaka University, Graduate School of Engineering, Professor, 大学院工学研究科, 教授 (30029160)
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| Co-Investigator(Kenkyū-buntansha) |
NAKATANI Ryoichi Osaka University, Graduate School of Engineering, Professor, 大学院工学研究科, 教授 (60314374)
ENDO Yasushi Osaka University, Graduate School of Engineering, Assistant Professor, 大学院工学研究科, 助手 (50335379)
SHIRATSUCHI Yu Osaka University, Graduate School of Engineering, Assistant Professor, 大学院工学研究科, 助手 (70379121)
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| Project Period (FY) |
2002 – 2006
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| Keywords | information memory device / magnetic memory / magnetization process / magnetic state / antiferromagnetic layer / exchange coupling / magnetostatic energy / magnetoresistance effect |
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| Research Abstract |
We have investigated magnetic properties and magnetization processes of sub-micron magnetic memory cells in order to find a breakthrough that increases a density of MRAM (magnetic random access memory).
(1) We have investigated method for recording magnetic memory. The magnetization direction of the asymmetric ring dots (material: 5-20 nm thick Ni-20at%Fe, diameter: 500-1000 nm) that have partly planed outer sides were controlled between clockwise and counterclockwise by in-plane magnetic fields, even though the ordinary ring dots needed the clockwise and counterclockwise magnetic fields caused by the perpendicular current.
(2) We also have found that the cup-shaped magnetic memory cell required lower magnetic field to be recorded than the ring memory.
(3) The Ni-Fe(10 nm)/Mn-Ir(10 nm) ring dot has fixed magnetization direction.
(4) The information recorded in the magnetic memory can be detected using atomic force microscopy with conductive probe.
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[Journal Article] Vortex Nucleation and Annihilation in Ni-Fe Annular Dots and Cup-shaped Dots for High-Density Memory Cells2004
Author(s)
Ryoichi Nakatani, Isao Sasaki, Tetsuo Yoshida, Keiichi Otaki, Yasushi Endo, Yoshio Kawamura, Masahiko Yamamoto, Takashi Takenaga, Sunao Aya, Takeharu Kuroiwa, Sadeh Beysen, Hiroshi Kobayashi
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Journal Title
International Symposium on Advanced Structural and Functional Materials Design
Pages: 8
Description
「研究成果報告書概要(和文)」より
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