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运输性质

运输性质

‘Racetrack’ memory demonstrated

11 Apr 2008

美国的物理学家首次证明,可以从类似森林的3D纳米线阵列或“racetracks”。演示表明,所谓的跑马场存储器应该比其他形式的信息存储更快,更便宜,并且正在走向商业现实。

斯图尔特·帕金(Stuart Parkin) 和IBM的同事’位于美国圣何塞的Almaden研究中心于2004年首次提出了赛道记忆的概念。该想法是将U形纳米线赛道阵列种植在硅片床上。沿着每个跑道的长度,在两个方向之一上被磁化的磁畴,每个磁畴边界或“wall”充当一个位— either a 1 or 0 — of information. By sending a current of spin-polarized electrons into one end of a racetrack, these domain 壁s can be shifted to and fro.

从理论上讲,阅读和书写信息都应该是可能的。—换句话说,“U” — on the silicon wafer. For example, a read head could sense the configuration of a domain 壁 by measuring how the 壁’s resistance changes in the magnetic field (a property known as magnetoresistance). A write head could consist of a perpendicular nanowire, which would switch the configuration of the domain 壁s as its own domains are shifted.

三位

将这一理论付诸实践一直很棘手,但Parkin’s team have now shown that it is possible, at least when the 赛马场 are positioned flat on the silicon wafer rather than upright. They have been able to write and read three bits in a matter of nanoseconds (科学 320 209)。

“看起来进展很好,”英国约克大学的徐永兵说。“原则上没有运动部件,并且’s a great advantage.”徐也对阅读和写作可以如此迅速地印象深刻— at a conference last year the IBM team suggested it would take microseconds. Still, he notes that manipulating many well defined domain 壁s will be challenging, which might mean a commercial prototype is three to five years away.

当赛道内存确实问世时,它似乎很快就会取代现有的内存类型。与基于晶体管2D阵列的随机存取存储器(RAM)不同,它的批量生产价格应该便宜。与硬盘存储器不同,硬盘存储器包含散布在旋转的金属磁盘上的磁性位,它应该快。

“It’这肯定是一个聪明的主意,而且执行得非常优雅,”英国剑桥大学的Mark Blamire说。“然而,这与任何种类的商业化之间的重大差距在于,是否可以开发出一种合适的技术来将占据大量晶圆面积的线性器件转变为垂直结构,而这种结构所占的比例要小得多。本文不’解决这个问题,但这绝对是极具挑战性的。”

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