Current-driven periodic domain wall creation in ferromagnetic nanowires

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 jc domain walls are injected into the nanowire with a period T~(j-j sub()c -1/2. I...

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Bibliographic Details
Published in:Physical review. B 2016-08, Vol.94 (6)
Main Authors: Sitte, Matthias, Everschor-Sitte, Karin, Valet, Thierry, Rodrigues, Davi R, Sinova, Jairo, Abanov, Ar
Format: Article
Language:English
Subjects:
Condensed matter
Domain walls
Exchange
Ferromagnetism
Magnetic fields
Mathematical analysis
Nanowires
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Summary: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 jc domain walls are injected into the nanowire with a period T~(j-j sub()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.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.94.064422