Current driven domain wall creation in ferromagnetic nano-wires

Abstract

We predict the electrical generation and injection of domain walls into a ferromagnetic nano-wire without the need of an assisting magnetic field. Our theory shows that above a critical current $j_c$ domain walls are injected into the nano-wire with a period $T\sim (j-j_c{)}^{-1/2}$. In a uniaxial anisotropy geometry this process does not require Dzyaloshinskii-Moria or dipole-dipole interaction and can be done in a simple exchange ferromagnet. We also show that this process and the period exponents are universal and do not depend on the peculiarities of the microscopic Hamiltonian.

this article is superseded by arXiv:1607.03336