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Structure and Sensor Properties of a Robust GMR Material System

Published online by Cambridge University Press:  10 February 2011

K.-M. H. Lenssen ,
J. J. T. M. Donkers ,
A. E. T. Kuiper  and
J. VAN Driel
K.-M. H. Lenssen
Affiliation:
Philips Research Laboratories, Prof. Holstlaan 4, NL-5656 AA Eindhoven, The Netherlands
J. J. T. M. Donkers
Affiliation:
Philips Centre for Manufacturing Technology, Prof. Holstlaan 4, NL-5656 AA Eindhoven, The Netherlands
A. E. T. Kuiper
Affiliation:
Philips Research Laboratories, Prof. Holstlaan 4, NL-5656 AA Eindhoven, The Netherlands
J. VAN Driel
Affiliation:
Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65, NL-1018 XE Amsterdam, The Netherlands
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Abstract

Recently we have developed a robust GMR material system, based on an artificial antiferromagnet which is exchange-biased with Ir-Mn. By combining magnetoresistance and magnetization measurements with Transmission Electron Microscopy analyses we show that the degree of [111] texture has direct effects on the sensor properties of the GMR multilayer. The degree of texture turns out to depend not only on the buffer layer, but also on the thickness of the Ir-Mn layer. The strongest texture is found for Ir-Mn layer thicknesses of around 4 nm. For this thickness the largest exchange-biasing field and GMR ratio are also obtained (after cooling in a magnetic field), but the blocking temperature is significantly reduced. If attention is paid to the material structure by choosing the right materials, layer thicknesses and stack order, a robust GMR multilayer system can be made that can withstand high temperatures (> 200°C) and strong magnetic fields (> 200 kA/m), as has been demonstrated experimentally.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 562: Symposium L – Polycrystalline Metal & Magnetic Thin Films , 1999 , 33
Copyright
Copyright © Materials Research Society 1999

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References

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