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Search Publications by: Robert D. McMichael (Assoc)

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Displaying 151 - 160 of 160

Optimizing the GMR of Symmetric and Bottom Spin Valves

January 1, 1996
Author(s)
William F. Egelhoff Jr., P J. Chen, Cedric J. Powell, Mark D. Stiles, Robert McMichael, C Lin, J Sivertsen, J Judy, K Takano, A Berkowitz, T Anthony, J Brug
We have attempted to optimize the values of the giant magnetoresistance in symmetric spin valves of the type NiO/Co/Cu/Co/Cu/Co/NiO (achieving 23.4%) and in bottom spin valves of the type Co/Cu/Co/NiO (achieving 17.0%), the largest values ever reported for

The Trade-off Between Large GMR and Small Coercivity in Symmetric Spin Valves

January 1, 1996
Author(s)
William F. Egelhoff Jr., P J. Chen, Cedric J. Powell, Mark D. Stiles, Robert McMichael, C Lin, J Sivertsen, J Judy, K Takano, A Berkowitz
We have investigated the use of various alloys as substitutes for pure Co in the center film of symmetric spin valves of the type NiO/Co/Cu/Co/Cu/Co/NiO. The aim of this work is to identify magnetic materials that exhibit smaller coercivities than pure Co

Magnetoresistance Values Exceeding 21 Percent in Symmetric Spin Valves

January 1, 1995
Author(s)
William F. Egelhoff Jr., T Ha, R Misra, Y Kadmon, J Nir, Cedric J. Powell, Mark D. Stiles, Robert McMichael, C Lin, J Sivertsen, J Judy, K Takano, A Berkowitz, T Anthony, J Brug
We report values of the giant magnetoresistance (GMR) effect exceeding 21% in symmetric spin valves, the highest values ever reported for such structures. The key elements in this achievement are the use of a Co/Cu/Co/Cu/Co multilayer in which the center

STM Studies of GMR Spin Valves

January 1, 1995
Author(s)
R Misra, T Ha, Y Kadmon, Cedric J. Powell, Mark D. Stiles, Robert McMichael
We have investigated the surface roughness and the grain size in giant magnetoresistance (GMR) spin valve multilayers of the general type: FeMn/Ni 80Fe 20/Co/Cu/Co/Ni 80 Fe 20 on glass and aluminum oxide substrates by scannin tunneling microscopy (STM)

Coercivities Above 10 kOe in CoPd Superlattices

Author(s)
William F. Egelhoff Jr., Cedric J. Powell, L Gan, P J. Chen, H Ettedgui, D Tirosh, Robert D. McMichael, Mark D. Stiles, J Mallett, Alexander J. Shapiro, John E. Bonevich, J H. Judy, Erik B. Svedberg, A. E. Berkowitz
We have achieved excellent grain isolation in CoPd superlattices by using 10 nm Au as both an underlayer and an overlayer and diffusing Au into the grain boundaries by annealing for {approximately equal to} 30 min. at 300 degrees C. The grain isolation

Suppressing of Unidirectional Coupling in Magnetic Tunnel Junctions by Preoxidation: Structural Studies

Author(s)
William F. Egelhoff Jr., Robert D. McMichael, Mark D. Stiles, Cedric J. Powell, John E. Bonevich, M Wormington, D S. Eastwood, B K. Tanner
Pre-oxidation of the bottom electrode prior to deposition of Al_{2}O_{3} or MgO is very effective as a general approach to suppressing the unidirectional coupling that is commonly observed in magnetic tunnel junctions. In this paper, we report structural