Current driven domain wall creation in ferromagnetic nano-wires

2015/12/02 by Rodrigues, Davi R., Sinova, Jairo, Abanov, Ar.
#FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall)

paper · doi:10.48550/arxiv.1512.00784

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∼ (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.

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