Ultra-High Density Magnetic Memory Cells

超高密度磁存储单元

• 批准号: 14102029
• 负责人: YAMAMOTO Masahiko
• 金额: $ 65.89万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (S)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14102029/
• 关键词: information memory device; magnetic memory; magnetization process; magnetic state; antiferromagnetic layer; exchange coupling; magnetostatic energy; magnetoresistance effect; 漏洩磁束; 情報記録層; 環状メモリセル; 還流磁区; 静磁結合

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.

我们已经研究了亚微米磁性存储器单元的磁性和磁化过程，以便找到增加MRAM（磁性随机存取存储器）密度的突破。(1)研究了磁存储器的记录方法。具有部分平面外侧的非对称环点（材料：5-20 nm厚的Ni-20at%Fe，直径：500-1000 nm）的磁化方向由面内磁场控制在顺时针和逆时针之间，即使普通环点需要由垂直电流引起的顺时针和逆时针磁场。(2)我们还发现，杯形磁存储单元需要较低的磁场比环形存储器记录。(3)Ni-Fe（10 nm）/Mn-Ir（10 nm）环点具有固定的磁化方向。(4)记录在磁存储器中的信息可以使用具有导电探针的原子力显微镜来检测。

项目成果

Transition between onion state and vortex state in exchange-coupled Ni-Fe/Mn-Ir asymmetric ring dots

交换耦合Ni-Fe/Mn-Ir不对称环点中洋葱态与涡旋态的转变

• 发表时间: 2006
• 期刊: J. Appl. Phys. 99・8
• 作者: Isao Sasaki;Ryoichi Nakatani;Yasushi Endo;Yoshio Kawamura;Masahiko Yamamoto
• 通讯作者: Masahiko Yamamoto

Toshiki Kingetsu, Yasuhiro Kamada, Masahiko Yamamoto: "Ternary Metallic Strained Superlattices"17th International Colloquium on Magnetic Films and Surfaces. 234-235 (2002)

Toshiki Kingetsu、Yasuhiro Kamada、Masahiko Yamamoto：“三元金属应变超晶格”第十七届国际磁性薄膜和表面研讨会。

Binary Logic Gates by Ferromagrietic Nanodots : Toward Spin Computing

铁磁纳米点的二进制逻辑门：迈向自旋计算

• 发表时间: 2004
• 期刊: International Symposium on Advanced Structural and Functional Materials Design
• 作者: Masahiko Yamamoto;S.Anisul Haque;Ryoichi Nakatani;Yasushi Endo
• 通讯作者: Yasushi Endo

Ryoichi Nakatani: "Magnetic Properties in Mn/Si-O/Si(100)-substrate systems and Mn/Si-O/Si trilayers"Jpn.J.Appl.Phys.. 42・6A. 3392-3393 (2003)

Ryoichi Nakatani：“Mn/Si-O/Si(100)-基底系统和Mn/Si-O/Si三层膜中的磁性”Jpn.J.Appl.Phys.. 42・6A (2003)。

Control of circular magnetizations in the Ni-Fe and Ni-Fe/Mn-Ir asymmctric ring dots

Ni-Fe 和 Ni-Fe/Mn-Ir 不对称环点中圆形磁化强度的控制

• 发表时间: 2006
• 期刊: 19^<th> ICMFS Digest
• 作者: I.Sasaki;R.Nakatani;Y.Endo;Y.Kawamura;M.Yamamoto;T.Takenaga;S.Aya;T.Kuroiwa;S.Beysen;H.Kobayashi
• 通讯作者: H.Kobayashi