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Current driven dynamics of domain walls constrained in ferromagnetic nanopillars

Current driven dynamics of domain walls constrained in ferromagnetic nanopillars
Current driven dynamics of domain walls constrained in ferromagnetic nanopillars
We investigate the effects of an electric current on the domain wall formed inside a cylindrical ferromagnetic nanopillar as a consequence of the pinning of the magnetization at its ends. We first present the results of three-dimensional and one-dimensional micromagnetic simulations and show that the system approaches a stationary equilibrium, where the domain wall is compressed in the direction of the electron flow and rotates around the nanopillar axis with constant frequency in the microwave frequency range. We obtain the dependence of the rotation frequency on the length of the nanopillar and on the magnitude of the applied current density. We then introduce a one-dimensional analytical model and find a formula for the rotation frequency in two current regimes: a low current regime, where the frequency is linearly proportional to the current density and a high current regime, where the frequency is quadratically proportional to the current density. Good agreement is found with the results of the simulations. The system may have possible applications as a nanosized microwave generator, which could operate without external magnetic fields and whose emission frequency could be controlled by a dc current.
1550-235X
054447-[7pp]
Franchin, Matteo
9e00aaa2-959e-420f-854c-3b43aece85e3
Fischbacher, Thomas
d3282f31-0a6a-4d19-80d0-e3bebc12f67a
Bordignon, Giuliano.
e592e668-dbe6-4632-b341-1413cbb7572e
de Groot, P.A.J.
98c21141-cf90-4e5c-8f2b-d2aae8efb84d
Fangohr, Hans
9b7cfab9-d5dc-45dc-947c-2eba5c81a160
Franchin, Matteo
9e00aaa2-959e-420f-854c-3b43aece85e3
Fischbacher, Thomas
d3282f31-0a6a-4d19-80d0-e3bebc12f67a
Bordignon, Giuliano.
e592e668-dbe6-4632-b341-1413cbb7572e
de Groot, P.A.J.
98c21141-cf90-4e5c-8f2b-d2aae8efb84d
Fangohr, Hans
9b7cfab9-d5dc-45dc-947c-2eba5c81a160

Franchin, Matteo, Fischbacher, Thomas, Bordignon, Giuliano., de Groot, P.A.J. and Fangohr, Hans (2008) Current driven dynamics of domain walls constrained in ferromagnetic nanopillars. Physical Review B, 78 (5), 054447-[7pp]. (doi:10.1103/PhysRevB.78.054447).

Record type: Article

Abstract

We investigate the effects of an electric current on the domain wall formed inside a cylindrical ferromagnetic nanopillar as a consequence of the pinning of the magnetization at its ends. We first present the results of three-dimensional and one-dimensional micromagnetic simulations and show that the system approaches a stationary equilibrium, where the domain wall is compressed in the direction of the electron flow and rotates around the nanopillar axis with constant frequency in the microwave frequency range. We obtain the dependence of the rotation frequency on the length of the nanopillar and on the magnitude of the applied current density. We then introduce a one-dimensional analytical model and find a formula for the rotation frequency in two current regimes: a low current regime, where the frequency is linearly proportional to the current density and a high current regime, where the frequency is quadratically proportional to the current density. Good agreement is found with the results of the simulations. The system may have possible applications as a nanosized microwave generator, which could operate without external magnetic fields and whose emission frequency could be controlled by a dc current.

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Published date: 1 August 2008

Identifiers

Local EPrints ID: 141682
URI: http://eprints.soton.ac.uk/id/eprint/141682
ISSN: 1550-235X
PURE UUID: 3b8d0e5c-4509-44a2-a61a-563c50de98a1
ORCID for Hans Fangohr: ORCID iD orcid.org/0000-0001-5494-7193

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Date deposited: 13 Apr 2010 15:47
Last modified: 14 Mar 2024 02:43

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Contributors

Author: Matteo Franchin
Author: Thomas Fischbacher
Author: Giuliano. Bordignon
Author: P.A.J. de Groot
Author: Hans Fangohr ORCID iD

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