Analytic theory for the switch from Bloch to Neel domain wall in nanowires with perpendicular anisotropy

Article

关键词: VELOCITY;   

DOI  :  10.1103/PhysRevB.92.214420

来源: SCIE

【 摘 要 】

Rectangular nanowires may have domain walls nucleated and moved through them to realize many devices. It has been shown that at a particular width and thickness of a nanowire with perpendicular anisotropy, there is a switch from the domain wall being of Bloch-type to it being of Neel-type. This critical shape can be found through micromagnetics simulations, but here we present an analytic calculation for the energies of both wall types involving approximations for the demagnetizing energy density. The approximations implemented include a one-dimensional model of the magnetization and a simplified initial magnetization configuration whereby the demagnetizing energy density is solved through an iterative process. The expressions developed are long, but have the advantage that by simply inputting material parameters for the magnetic material, the critical shape can be found using a calculator in a matter of seconds. We compare our results to those found using micromagnetics and those found experimentally and the agreement is good.

【 授权许可】

Free