Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 28: Spin Dynamics and Transport: Domain Walls

MA 28.6: Vortrag

Dienstag, 21. März 2017, 15:15–15:30, HSZ 401

Current-driven periodic domain wall creation in ferromagnetic nanowires — •Matthias Sitte¹, Karin Everschor-Sitte¹, Thierry Valet¹, Davi R. Rodrigues², Jairo Sinova^1,3, and Artem Abanov² — ¹Institute of Physics, Johannes Gutenberg-Universität, 55128 Mainz, Germany — ²Department of Physics & Astronomy, Texas A&M University, College Station, Texas 77843-4242, USA — ³Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnicka 10, 162 53 Praha 6, Czech Republic

We predict the electrical generation and injection of domain walls into a ferromagnetic nanowire 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 nanowire with a period T ∼ (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 such as 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.