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Exchange bias effects in ferromagnetic wires

Exchange bias effects in ferromagnetic wires
Exchange bias effects in ferromagnetic wires
We have investigated the exchange bias effect in micron-sized ferromagnetic wires made from Co and Ni80Fe20 films. The wires were fabricated using optical lithography, metallization by sputtering and lift-off technique. Magnetotransport measurements were performed at temperatures ranging from 3 to 300 K. We observed marked changes in the magnetoresistance (MR) properties as the temperature is varied. At 300 K, the field at which the sharp peak occurs corresponding to the magnetization reversal of the Co wires is 167 Oe and is symmetrical about the origin. As the temperature was decreased to 3K, we observed a shift in the peak positions of the MR characteristics for both the forward and reverse field sweeps corresponding to a loop shift of 582 Oe in the field axis. The asymmetric shift in the MR loops at lowtemperatures clearly indicates the exchange bias between ferromagnetic (Co) and antiferromagnetic parts (Co-oxide at the surfaces) from natural oxidation. Ni80Fe20 wires of the same geometry showed similar effect with a low exchange bias field. The onset of exchange biasing effect is found to be 70 and 15K for the Co and Ni80Fe20 wires,respectively. A striking effect is the existence of exchange biasing effect from the sidewalls of the wires even when the wires were capped with Au film.
Magnetoresistance, Exchange Bias, Ferromagnetic Wires
0304-8853
191-196
Husain, M. K.
92db1f76-6760-4cf2-8e30-5d4a602fe15b
Adeyeye, A. O.
debaea1e-8c7a-4874-9577-b9342c81a640
Wang, C. C.
e570afe6-915d-4bbd-bf51-4262aa58e59a
Ng, V.
c3c41fdf-5833-4774-aeef-d3b310b525b9
Low, T. S.
9230ec97-0ed7-4e07-8caa-d2b03956d34b
Husain, M. K.
92db1f76-6760-4cf2-8e30-5d4a602fe15b
Adeyeye, A. O.
debaea1e-8c7a-4874-9577-b9342c81a640
Wang, C. C.
e570afe6-915d-4bbd-bf51-4262aa58e59a
Ng, V.
c3c41fdf-5833-4774-aeef-d3b310b525b9
Low, T. S.
9230ec97-0ed7-4e07-8caa-d2b03956d34b

Husain, M. K., Adeyeye, A. O., Wang, C. C., Ng, V. and Low, T. S. (2003) Exchange bias effects in ferromagnetic wires. Journal of Magnetism and Magnetic Materials, 267, 191-196.

Record type: Article

Abstract

We have investigated the exchange bias effect in micron-sized ferromagnetic wires made from Co and Ni80Fe20 films. The wires were fabricated using optical lithography, metallization by sputtering and lift-off technique. Magnetotransport measurements were performed at temperatures ranging from 3 to 300 K. We observed marked changes in the magnetoresistance (MR) properties as the temperature is varied. At 300 K, the field at which the sharp peak occurs corresponding to the magnetization reversal of the Co wires is 167 Oe and is symmetrical about the origin. As the temperature was decreased to 3K, we observed a shift in the peak positions of the MR characteristics for both the forward and reverse field sweeps corresponding to a loop shift of 582 Oe in the field axis. The asymmetric shift in the MR loops at lowtemperatures clearly indicates the exchange bias between ferromagnetic (Co) and antiferromagnetic parts (Co-oxide at the surfaces) from natural oxidation. Ni80Fe20 wires of the same geometry showed similar effect with a low exchange bias field. The onset of exchange biasing effect is found to be 70 and 15K for the Co and Ni80Fe20 wires,respectively. A striking effect is the existence of exchange biasing effect from the sidewalls of the wires even when the wires were capped with Au film.

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Published date: 2003
Keywords: Magnetoresistance, Exchange Bias, Ferromagnetic Wires
Organisations: Nanoelectronics and Nanotechnology

Identifiers

Local EPrints ID: 262380
URI: http://eprints.soton.ac.uk/id/eprint/262380
ISSN: 0304-8853
PURE UUID: 40432cf7-997d-4458-b5b3-a5472c441e1d

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Date deposited: 20 Apr 2006
Last modified: 11 Nov 2019 21:09

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