Abstract
Dynamics of multiple transverse walls (TWs) in a magnetic nanostripe is studied by micromagnetic simulations. It shows that, when TWs are arranged in a stripe with same orientation, they will attract each other and finally annihilate. However, when adjacent TWs are arranged with opposite orientation, a metastable complex wall can be formed, e.g., two TWs lead to 360o wall. For three or more TWs, the formed complex wall includes a number of 360o substructures, which is called multiple 360o structure (M360S) here. The M360S itself may be used to store multiple logical data since each 360o substructure can act as logical ”0” or ”1”. On the other hand, the M360S may behave like single TW under an applied current, namely, the M360S can be driven steadily by current like that of single TW. A parity effect of the number of 360o substructures on the critical current for the annihilation is found. Namely, when the number is odd or even, the critical current increase or decrease with the increasing of the number, respectively. The parity effect is relevant to the out-of-plane magnetic moment of the M360S.
Highlights
Current-driven manipulation of magnetic domain walls in patterned magnetized thin-film stripes has attracted much interest because of its potential applications for next-generation data storage[1] and logic devices.[2]
When adjacent transverse walls (TWs) are arranged with opposite orientation, a metastable complex wall can be formed, e.g., two TWs lead to 360o wall
The results show that the TWs with same orientation will annihilate because there is only the long-range attractive interaction between them
Summary
Current-driven manipulation of magnetic domain walls in patterned magnetized thin-film stripes has attracted much interest because of its potential applications for next-generation data storage[1] and logic devices.[2]. In order to achieve high data density, the DWs must be placed very close to each other In this case, the long-range magnetostatic interaction between DWs may affect the dynamic behavior of DWs motion and even lead to information distorted. We find that the long-range interaction between two transverse walls (TWs) can not be neglected even though the distance between two TWs is as large as 1000nm This indicates that the structure of multiple domains divided by multiple DWs in a stripe is not suitable for storing multiple logical data. The orientation of each TW may be placed along + y or − y direction In such magnetic nanostripe, there are sizeable distortions occurring in left-end and right-end edges of the stripe, which may somewhat affect the dynamics of the TWs. In order to avoid the distortions, the local magnetization in the left-end and right-end edges of the stripe are pinned in plane.
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