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Search Publications by: Mark D. Stiles (Fed)

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Displaying 351 - 375 of 383

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

Coarsening of Unstable Surface Features During Fe(001) Homoepitaxy

January 1, 1995
Author(s)
Joseph A. Stroscio, Daniel T. Pierce, Mark D. Stiles, A Zangwill, L Sander
The evolution of the surface profile during homoepitaxial growth of Fe(001) is studied by scanning tunnelling microscopy and reflection high energy electron diffraction. The observed morphology exhibits a non-self affine collection of mound-like features

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)

Exchange Coupling in Magnetic Heterostructures

January 1, 1993
Author(s)
Mark D. Stiles
Many structures consisting of magnetic layers separated by a nonmagnetic spacer layer show an oscillatory exchange coupling. This behavior is explained in terms of a simple model that shows that the Fermi surface of the spacer layer material is responsible

Theory of Photo-induced Resonant Tunneling in Heterojunctions

January 1, 1992
Author(s)
S Apell, David R. Penn, Mark D. Stiles
The theoretical basis for understanding photo-assisted resonant tunneling is generally taken to be the theory by Tien and Gordon [Phys. Rev. 129, 647 (1963)] in which the effect of a photon field on an energy state is to create sidebands at multiples of

Kinematic Theory of BEEM Spectroscopy of Silicon-Silicide Interfaces

January 1, 1991
Author(s)
Mark D. Stiles, D Hamann
The electronic structure of the materials being measured has a strong effect on the spectroscopy of the interface between them measured by ballistic electron emission microscopy (BEEM). Specific calculations for CoSi 2/Si(111) and NiSi 2/Si(111) based on

Quantum Fluctuations and the Single Junction Coulomb Blockade

January 1, 1990
Author(s)
S Girvin, L Glazman, M Jonson, David R. Penn, Mark D. Stiles
We investigate the effect of quantum flucuations on the Coulomb blockade in a single tunnel junction coupled to its environment by a transmission line of arbitrary impedance Z (ω). The quantized oscillating modes of the transmission line are suddenly