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Sensors and Actuators A 116 (2004) 95102 Planar Hall effect and magnetoresistance in Co/Cu multilayer films
 

Summary: Sensors and Actuators A 116 (2004) 95102
Planar Hall effect and magnetoresistance in Co/Cu multilayer films
A.O. Adeyeye, M.T. Win, T.A. Tan, G.S. Chong, V. Ng, T.S. Low
Information Storage Materials Laboratory, Department of Electrical and Computer Engineering,
National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore
Received 27 November 2003; received in revised form 30 March 2004; accepted 30 March 2004
Available online 6 May 2004
Abstract
The magnetization reversal process and magnetotransport properties of [Co (10 nm)/Cu (tCu)/Co (10 nm)]2 multilayer films have been
investigated using a combination of planar Hall effect (PHE) and anisotropic magnetoresistance (AMR) measurements. We have studied
the effects of interlayer exchange coupling in the Co/Cu multilayer films by varying the thickness of the Cu spacer layer in the range
0 tCu 15 nm for fixed Co thickness. We observed marked changes in both the magnetic and magnetotransport properties for varied
tCu due to the effect of interlayer exchange coupling. For tCu = 5 nm, a complex magnetic spin state develops in the PHE output which
may be attributed to anti-ferromagnetic coupling between the adjacent magnetic layers in contrast with ferromagnetic coupling observed
for tCu = 2 nm. We have also made a direct comparison of AMR and PHE voltages as a function of the orientation of the constant applied
field relative to the current direction. We observed that PHE output voltage is extremely sensitive to exact spin orientation when compared
with AMR voltage measured simultaneously on the same device. When the applied field is less than the switching field of the device PHE
voltage reveals a departure from the sin 2 behaviour predicted by theory due to domain wall propagation.
2004 Elsevier B.V. All rights reserved.
Keywords: Planar Hall effect; Magnetoresistance; Interlayer exchange coupling

  

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

 

Collections: Physics; Materials Science