We report room and low temperature magnetoresistance measurements on submicrometer scale elements (wires and crosses, 1.0, 0.5, and 0.1 μm) of with varying Ir concentrations. For the particular Ir concentrations studied, the anisotropic magnetoresistance (AMR) ratio varied between −0.043% and −0.035% at room temperature. For the single wires (0.5–1 μm) the MR versus field characteristic is similar to that reported for wires of similar size, but an opposite sign of the AMR is observed for For H parallel to the wire axis, the reversal is determined by the sweeping of a few domains which give rise to “ears” in the MR–H characteristic. For H perpendicular to the wire, a parabolic variation is seen corresponding to rotation of the magnetization, but a negative slope in the MR-H characteristic is obtained at high fields as in permalloy wires. This suggests that the high field behavior originates from a distinctly different mechanism (e.g., surface scattering) from that of AMR.
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15 May 2003
47th Annual Conference on Magnetism & Magnetic Materials
11-15 November 2002
Tampa, Florida (USA)
Research Article|
May 15 2003
Magnetoresistance magnetometry of wires with varying anisotropic magnetoresistance ratio
C. A. F. Vaz;
C. A. F. Vaz
Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom
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E. Blackburn;
E. Blackburn
Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom
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M. Kläui;
M. Kläui
Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom
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J. A. C. Bland;
J. A. C. Bland
Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, United Kingdom
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Li Gan;
Li Gan
National Institute of Standards and Technology, Gaithersburg, Maryland 20899
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W. F. Egelhoff, Jr.;
W. F. Egelhoff, Jr.
National Institute of Standards and Technology, Gaithersburg, Maryland 20899
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E. Cambril;
E. Cambril
CNRS-Laboratoire de Photonique et de Nanostructures, Route de Nozay, 91460 Marcoussis, France
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G. Faini;
G. Faini
CNRS-Laboratoire de Photonique et de Nanostructures, Route de Nozay, 91460 Marcoussis, France
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W. Wernsdorfer
W. Wernsdorfer
CNRS Laboratoire de Magnétisme Louis Néel, BP 166, 38042 Grenoble, France
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J. Appl. Phys. 93, 8104–8106 (2003)
Citation
C. A. F. Vaz, E. Blackburn, M. Kläui, J. A. C. Bland, Li Gan, W. F. Egelhoff, E. Cambril, G. Faini, W. Wernsdorfer; Magnetoresistance magnetometry of wires with varying anisotropic magnetoresistance ratio. J. Appl. Phys. 15 May 2003; 93 (10): 8104–8106. https://doi.org/10.1063/1.1540056
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