Current-driven periodic 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 analytical and numerical results show that above a critical current $j_c$ domain walls are injected into the nano-wire with a period $T\sim (j-j_c{)}^{-1/2}$. Importantly, domain walls can be produced periodically even in a simple exchange ferromagnet with uniaxial anisotropy, without requiring any standard "twisting" interaction like Dzyaloshinskii-Moriya or dipole-dipole interactions. We show analytically that this process and the period exponents are universal and do not depend on the peculiarities of the microscopic Hamiltonian. Finally we give a specific proposal for an experimental realization.

arXiv comment7 pages, 3 figures; this article supersedes arXiv:1512.00784

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