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Temperature Dependence of the Magnetoresistance of Co/Re Superlattices

Published online by Cambridge University Press:  21 March 2011

Timothy Charlton ,
David Lederman  and
Gian P. Felcher
Timothy Charlton
Affiliation:
Department of Physics, West Virginia University, Morgantown, WV 26506-6315
David Lederman
Affiliation:
Department of Physics, West Virginia University, Morgantown, WV 26506-6315
Gian P. Felcher
Affiliation:
Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, MSD/223, Argonne, IL 60439-4845
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Abstract

Hcp (10.0) Co/Re superlattices were grown by dc magnetron sputtering on sapphire (11.0) substrates with the [00.1] direction of the superlattice in the film plane. The temperature-dependent magnetoresistance (MR) was measured on samples patterned by photolithography from 10 K to 300 K in a 5.5 T superconducting magnet. The pattern allows the measurement of the MR with the current (I) and the magnetic field (H) parallel or perpendicular to the magnetic easy axis (c, the [00.1] direction). Measurements at 5 K on an antiferromagnetically-coupled sample shows dips in the MR near H = 0 when H ∕∕ c and H ⊥ I, dips below the saturation value at H ∼ 2.5 kOe for H ∕∕ c and H ∕∕ I configuration due to the competition between the anisotropic magnetoresistance (AMR) and the giant magnetoresistance (GMR). Since the AMR is dependent on the transport within the ferromagnetic layers, the temperature dependence yields information about the relative magnitudes of interface vs. bulk spin-dependent scattering. Our analysis shows that the GMR is anisotropic and that the spin-dependent scattering occurs predominantly at the interfaces only for certain configurations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 674: Symposia T/U/V – Applications of Ferromagnetic and Optical Materials, Storage and Magnetoelectronics , 2001 , T1.4
Copyright
Copyright © Materials Research Society 2001

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