Numerical study of magnetic properties of nanowire arrays

The Gauss-Seidel projection method is used to study the magnetic properties of nanowire arrays. We make a number of improvements of the numerical scheme so that the method is more efficient for the nanowire array configurations. A 3-D parallel code was developed and implemented. We study the correlation between the microstructure and the magnetic properties of the nanowire array. It is found that coercivity decreases when wire number increases. Our results also show that coercivity for an nanowire array is significantly smaller than that for a single wire. Decreasing the interwire distance would reduce the switch field and at the same time increase the recording density. Another way to reduce the switching field is to reduce the wire length. Dynamics of the magnetic switching for nanowire array is also investigated. These results have important implications in the high density magnetic recording applications.