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Low field giant magnetoresistance in coupled elliptical rings S. Jain and A. O. Adeyeyea
 

Summary: Low field giant magnetoresistance in coupled elliptical rings
S. Jain and A. O. Adeyeyea
Information Storage Materials Laboratory, Department of Electrical and Computer Engineering,
National University of Singapore, Singapore 117576, Singapore
Received 27 August 2008; accepted 2 October 2008; published online 20 November 2008
The giant magnetoresistance response of ellipse shaped Co 10 nm /Cu 8 nm /
Ni80Fe20 10 nm /Cu 2 nm rings magnetostatically coupled to external magnetic elements has
been systematically investigated. Magnetoresistance responses at low field show distinct states when
the field is cycled through various intermediate magnetization states of Ni80Fe20 and Co layers. Due
to strong magnetostatic coupling between the ring and the external magnetic elements, these
metastable intermediate states were not observed when the field is cycled through saturation. We
have also investigated the temperature dependence of magnetization behavior of these rings. Our
experimental results are in good agreement with micromagnetic simulations.
2008 American Institute of Physics. DOI: 10.1063/1.3021144
I. INTRODUCTION
Lithographically defined ferromagnetic nanostructures
have received much interest in the last decade due to their
suitability in various magnetoelectronic devices such as mag-
netic random access memory MRAM cells1
and high-

  

Source: Adeyeye, Adekunle - Department of Electrical and Computer Engineering, National University of Singapore

 

Collections: Physics; Materials Science