Europhys. Lett.
Volume 65, Number 4, February 2004
Page(s) 526 - 532
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 February 2004
Europhys. Lett., 65 (4) , pp. 526-532 (2004)
DOI: 10.1209/epl/i2003-10112-5

Domain wall propagation in magnetic nanowires by spin-polarized current injection

N. Vernier, D. A. Allwood, D. Atkinson, M. D. Cooke and R. P. Cowburn

Nanomagnetism Group, Department of Physics, University of Durham Rochester Building, Science Laboratories South Road, Durham DH1 3LE, UK

(Received 7 July 2003; accepted 3 December 2003)

We demonstrate movement of a head-to-head domain wall through a magnetic nanowire of permalloy ( $\chem{Ni_{81}Fe_{19}}$) simply by passing an electrical current through the domain wall and without any external magnetic field applied. The effect depends on the sense and magnitude of the electrical current and allows direct propagation of domain walls through complex nanowire shapes, contrary to the case of magnetic-field-induced propagation. The efficiency of this mechanism has been evaluated and the effective force acting on the wall has been found equal to $0.44\times
10^{-9}$ $\un{N\, A^{-1}}$.

72.25.Pn - Current-driven spin pumping.
75.60.Ch - Domain walls and domain structure.
85.75.-d - Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields.

© EDP Sciences 2004