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Search Publications by: Robert D. McMichael (Assoc)

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Displaying 201 - 225 of 314

Structural Effects in the Growth of Giant Magneto Resistance (GMR) Spin Valves

August 1, 2001
Author(s)
M. Menyhard, G. Zsolt, P. J. Chen, Cedric J. Powell, Robert D. McMichael, William F. Egelhoff Jr.
An investigation has been made of the thin-film structure and interface morphology of giant magnetoresistance (GMR) spin valves of the cobalt/copper/cobalt (Co/Cu/Co) type that were grown on polycrystalline NiO substrates at three different temperatures

Structural Effects in the Growth of Giant Magnetoresistance (GMR) Spin Valves

August 1, 2001
Author(s)
M. Menyhard, G. Zsolt, P J. Chen, Cedric J. Powell, Robert McMichael, William F. Egelhoff Jr.
Giant magnetoresistance (GMR) spin valves of the Co/Cu/Co type were grown on polycrystalline NiO substrates at three different temperatures. The GMR values and growth temperatures were: 14% for 150 K growth, 10% for 300 K growth, and 0% for 450 K growth

Surface and Interface Effects in the Growth of Giant Magnetoresistance Spin Valves for Ultrahigh-Density Data-Storage Applications

August 1, 2001
Author(s)
William F. Egelhoff Jr., P J. Chen, Cedric J. Powell, Robert D. McMichael, Mark D. Stiles
The current generation of hard disk drives use Giant Magnetoresistance (GMR) spin valves as the read-head because the GMR effect is currently the most sensitive way to detect magnetic fields at submicron length scales and data rates of {approximately equal

Switching Dynamics and Critical Behavior of Standard Problem No. 4

June 1, 2001
Author(s)
Robert McMichael, Michael J. Donahue, Donald G. Porter, J Eicke
We report switching dynamics for uMAG standard problem no. 4, a 500 nm x 125 nm x 3 nm rectangle of material with properties to mimic Permalloy. Siwtching dynamics are calculated for fields applied instantaneously to an initial s-state: Field 1 at 170o and

Large Anisotropy Via Oblique Sputtering of Ta Underlayers

May 1, 2001
Author(s)
John E. Bonevich, Robert D. McMichael, Chang H. Lee, P J. Chen, W Wyatt Miller, William F. Egelhoff Jr.
Anisotropy fields in excess of 120 KA/m (1500 Oe) have been produced in 3 nm to 5 nm thick polycrystalline films of Co by oblique sputtering of Ta underlayers. The unusually high anisotropy is magnetostatic in origin, and is induced by corrugations on the

Surface Oxidation as a Diffusion Barrier for Al Deposited on Ferromagnetic Metals

May 1, 2001
Author(s)
William F. Egelhoff Jr., P J. Chen, Robert D. McMichael, Cedric J. Powell, R Deslattes, F G. Serpa, Romel Gomez
We have used Grazing Incidence X-ray Reflectometry (GIXR) to study surface oxidation as a diffusion barrier for Al deposited on ferromagnetic metals (Co, Fe, Ni, and NiFe). Samples of the form SiO2 // 10nm X / 4nm Al and SiO2 // 10nm X/ 4nm Au with X = (Co

Abstracts for the MSEL Assessment Panel, March 2001

January 26, 2001
Author(s)
Leslie E. Smith, Alamgir Karim, Leonid A. Bendersky, C Lu, J J. Scott, Ichiro Takeuchi, Kathleen M. Flynn, Vinod K. Tewary, Davor Balzar, G A. Alers, Stephen E. Russek, Charles C. Han, Haonan Wang, William E. Wallace, Daniel A. Fischer, K Efimenko, Wen-Li Wu, Jan Genzer, Joseph C. Woicik, Thomas H. Gnaeupel-Herold, Henry J. Prask, Charles F. Majkrzak, Norman F. Berk, John G. Barker, Charles J. Glinka, Eric K. Lin, Ward L. Johnson, Paul R. Heyliger, David T. Read, R R. Keller, J Blendell, Grady S. White, Lin-Sien H. Lum, Eric J. Cockayne, Igor Levin, C E. Johnson, Maureen E. Williams, Gery R. Stafford, William J. Boettinger, Kil-Won Moon, Daniel Josell, Daniel Wheeler, Thomas P. Moffat, W H. Huber, Lee J. Richter, Clayton S. Yang, Robert D. Shull, R A. Fry, Robert D. McMichael, William F. Egelhoff Jr., Ursula R. Kattner, James A. Warren, Jonathan E. Guyer, Steven P. Mates, Stephen D. Ridder, Frank S. Biancaniello, D Basak, Jon C. Geist, Kalman D. Migler
Abstracts relating to research and development in the NIST Materials Science and Engineering Laboratory (MSEL) are presented for a poster session to be presented to the 2001 MSEL Assessment Panel.

Coercivity in Exchange-Bias Bilayers

January 18, 2001
Author(s)
Mark D. Stiles, Robert D. McMichael
Simulations of magnetic reversal in polycrystalline exchange-bias bilayers exhibit two contributions to the enhanced coercivity found in exchange-bias systems, one due to inhomogeneous reversal and and the other to irreversible transitions in the

Detection of Pinholes in Ultrathin Films by Magnetic Coupling

January 1, 2001
Author(s)
William F. Egelhoff Jr., L Gan, P J. Chen, Cedric J. Powell, Robert McMichael, R A. Fry
When two magnetic films are separated by a nonmagnetic film, pinholes in the nonmagnetic film can allow direct contact and, thereby, magnetic coupling between the two magnetic films. We have studied this coupling by having one of the magnetic films pinned

Magnetic Anisotropy and Thermal Stability of Ta-pinned Spin Valves

January 1, 2001
Author(s)
R A. Fry, Robert D. McMichael, John E. Bonevich, P J. Chen, William F. Egelhoff Jr., Chang H. Lee
It has recently been found that large uniaxial anisotropy fields in excess of 120 kA/m (1500 Oe) can be created in thin (3 nm to 5 nm) films of Co by obliquely sputtered Ta underlayers. This anisotropy can be used to pin the bottom film of a spin valve