サブマイクロメーターフェロマグネティック NOTゲートとシフトレジスタ
D A Allwood1, Gang Xiong, M D Cooke
1Department of Physics, University of Durham, Rochester Building, Science Laboratories, South Road, Durham DH1 3LE, UK.
Science (New York, N.Y.)
|June 18, 2002
まとめ
この研究は,室温で磁気ロジック NOT オペレーションと周波数分割を実行できる新しい全金属装置を実証しています. 複数のデバイスが接続され,機能的な磁気シフトレジスタを作成し,磁気コンピューティングの可能性を向上させました.
科学分野:
- スピントロニクスとナノマグネティクス
- ソリッドステートデバイス
背景:
- 従来の半導体ベースの論理デバイスは,速度と電力消費量の制限に直面しています.
- 次世代コンピューティングのための代替材料や現象の探索は極めて重要です.
研究 の 目的:
- 磁気論理操作のための全金属サブマイクロメートル装置を実験的に実証する.
- デバイスの周波数分割能力をフィードバックループで調べる.
- これらの装置を使用して磁気シフトレジスタを構築する.
主な方法:
- 2端の鉄磁気構造の製造と実験的特徴付け.
- 周波数分割を研究するために,磁気フィードバックループにデバイスを統合する.
- 複数のデバイスを直接リンクしてシフトレジスタアーキテクチャを形成します.
主要な成果:
- 部屋温度の磁気信号を用いた論理的な NOT 操作の実証.
- 適用された振動する磁場の周波数分割を装置によって観察する.
- 最大11のリンクされた接点からなる磁気シフトレジスタの建設と成功した運用.
結論:
- 完全に金属製の装置は,完全に磁気的な論理と信号処理の有望性を示しています.
- 展示された磁気シフトレジスタは,統合された磁気メモリと論理システムに向けた重要なステップです.
- この研究は,スピントロニックコンピューティング技術の開発に寄与しています.
関連する概念動画
01:30Magnetism
Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
01:26Diamagnetism
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
01:25Eddy Currents
Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
01:31Magnetic Susceptibility and Permeability
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
01:17Magnetic Damping
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
01:19Magnetic Declination
Magnetic declination is the angle between true north, which aligns with the Earth's rotational axis, and magnetic north, which follows the direction of the Earth's magnetic field. This discrepancy exists because the magnetic poles do not coincide with the geographic poles. The value of magnetic declination depends on the observer's location on Earth and is subject to changes over time due to the dynamic nature of the Earth's magnetic field.The declination is called eastern when magnetic north...