Magnetic computing system

我们已经研究了使用磁现象进行计算的磁计算系统。（1）利用微磁学模拟方法研究了磁单元的磁性能。结果表明，长径比为1：2的椭圆胞元更容易传递信息，并能保存“0”和“1”的信息。（2）磁逻辑门由4个尺寸为80 nm × 40 nm的椭圆形单元组成，可以计算放入3个磁单元中的信息。计算结果显示在另一个磁单元中。计算是利用磁单元之间的静磁相互作用进行的。（3）当输入磁逻辑门的一个磁单元的信息为“0”时，磁逻辑门作为“或非门”工作。另一方面，当放入一个磁单元的信息是“1”时，磁逻辑门就像与非门一样工作。（4）磁性逻辑门的制作实验结果表明，圆形单元和椭圆形单元具有较低的磁开关场，从低场工作的角度来看，圆形单元和椭圆形单元适合于磁性逻辑门。然而，圆形细胞有一个趋势，有涡旋磁状态。因此，圆形单元不适合作为磁逻辑门的磁性单元。

We have investigated magnetic computing systems that use magnetic phenomena for the computing.(1)Shapes of the magnetic cells are investigated with using micro magnetics simulation. The results show that elliptic cells with aspect ratio of 1:2 easily transmit the information and hold the information of "0" and "1".(2)Magnetic logic gate consists of 4 elliptic cells, that size are 80 nm x 40 nm, can compute the information that is put into 3 magnetic cells. The result of the computing is indicated in another magnetic cell. The computing is performed with magnetostatic interaction among the magnetic cells.(3)When the information that put into one magnetic cell of magnetic logic gate is "0", the magnetic logic gate works as NOR gate. On the other hand, when the information that put into one magnetic cell is "1", the magnetic logic gate works as NAND gate.(4)The experimental results of fabricating the magnetic logic gates show that the circular cells and elliptic cells have low magnetic switching fields, and thus the circular cells and elliptic cells are suitable for magnetic cells for the point of view of low field working. However, the circular cells have a tendency to have vortex magnetic states. Therefore, the circular cells are not suitable for the magnetic cells of magnetic logic gates.