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Search Publications by: Robert D. McMichael (Assoc)

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Displaying 126 - 150 of 158

Switching Mechanism of Single Domain Particles in a Two-Dimensional Array

September 1, 1999
Author(s)
Martha Pardavi-Horvath, G Vertesy, B Keszei, Z Vertesy, Robert D. McMichael
The mechanism of switching of uniaxial, single domain, single crystalline epitaxial garnet particles on a 2D square array was investigated. The anisotropy field of the sample is 2 kOe, while the gaussian switching field distribution is 280 85 Oe. The

Specular Electron Scattering in Metallic Thin Films

May 1, 1999
Author(s)
William F. Egelhoff Jr., P J. Chen, Cedric J. Powell, D Parks, F Serpa, Robert McMichael, D Martien, A. E. Berkowitz
Specular electron scattering at the surface of metallic thin films is an important phenomenon for a class of magnetic multilayers known as giant magnetoresistance (GMR) spin valves. In the very best GMR spin valves, a significant part of the GMR effect is

Structural and Magnetic Properties of Electrodeposited Co/Cu Multilayers

March 1, 1999
Author(s)
M Shima, L Salamanca-Riba, Thomas P. Moffat, Robert D. McMichael
A series of [Co(x ML)/Cu(17 ML)]100 multilayers were electrodeposited on Si(0 0 1) substrates covered with Cu seed layers. Magnetic hysteresis loops for lms with x 2 ML have sigmoidal shapes and the temperature dependence indicates a superparamagnetic

Model for Exchange Bias in Polycrystalline Ferromagnet-Antiferromagnet Bilayers

February 1, 1999
Author(s)
Mark D. Stiles, Robert D. McMichael
Polycrystalline ferromagnet-antiferromagnet bilayers exhibit a wide range of interesting magnetic effects. This paper describes a model for these bilayers which explains not only the unidirectional anisotropy that gives rise to the well known shifted

Exchange Bias Relaxation in CoO-Biased Films

January 1, 1999
Author(s)
Robert McMichael, C Lee, Mark D. Stiles, F Serpa, P J. Chen, William F. Egelhoff Jr.
Because the memory of the bias direction is carried by the antiferromagnetic order in exchange biased films, the stability of the antiferromagnetic order is critical to the existence of the exchange bias field. Ferromagnetic resonance was used to measure

Ferromagnetic Resonance Studies of NiO-Coupled Thin Films of Ni 80 Fe 20

October 1, 1998
Author(s)
Robert D. McMichael, Mark D. Stiles, P J. Chen, William F. Egelhoff Jr.
This paper describes ferromagnetic resonance (FMR) and magnetoresistive measurements of thin magnetic films coupled to antiferromagnetic films. First, FMR results for films of Ni 80Fe 20 show that coupling to NiO produces the angular variation in the

Ferromagnetic Resonance Linewidth in Thin Films Coupled to NiO

June 1, 1998
Author(s)
Robert D. McMichael, Mark D. Stiles, P J. Chen, William F. Egelhoff Jr.
The out-of-plane angular dependence of the ferromagnetic resonance linewidth, [Δ] H, has been measured for thin magnetic films coupled to NiO and for uncoupled control films. In the control films, [Δ] is described by nearly angle-independent damping

Optimizing GMR Spin Valves: The Outlook for Improved Properties

June 1, 1998
Author(s)
William F. Egelhoff Jr., P J. Chen, Cedric J. Powell, D Parks, Robert McMichael, J Judy, D Martien, A. E. Berkowitz, J M. Daughton
The current generation of giant magnetoresistance (GMR) spin valves exhibits performance characteristics which are not quite as good as desired for ultrahigh-density nonvolatile memory applications. This paper addresses the scientific issues underlying the

Ferromagnetic Resonance Linewidth in Thin Films Coupled to NiO

January 1, 1998
Author(s)
Robert McMichael, Mark D. Stiles, P J. Chen, William F. Egelhoff Jr.
The out-of-plane angular dependence of the ferromagnetic resonance linewidth, Δ H is described by nearly angle-independent damping parameters. In the NiO-coupled films, however, the damping was found to depend strongly on magnetization orientation, with

Ferromagnetic Resonance Studies of NiO-coupled Thin Films of Ni 80 Fe 20

January 1, 1998
Author(s)
Robert McMichael, Mark D. Stiles, P J. Chen, William F. Egelhoff Jr.
This paper describes ferromagnetic resonance (FMR) and magnetoresistive measurements of thin magnetic films coupled to antiferromagnetic films. First, FMR results for films of Ni 80Fe^d20 show that coupling to NiO produces the angular variation in the

Oxygen as a Surfactant in the Growth of Giant Magnetoresistance Spin Valves

January 1, 1998
Author(s)
P J. Chen, Cedric J. Powell, Mark D. Stiles, Robert McMichael, J Judy, K Takano, A Berkowitz
We have found a novel method for increasing the giant magnetoresistance (GMR) of Co/Cu spin valves with the use of oxygen. Surprisingly, spin valves with the largest GMR are not produced in the best vacuum. Introducing 5x10 -9 Torr (7x10 -7 Pa) into our

Oxygen as a Surfactant in the Growth of Giant Magnetoresistance Spin Valves

December 1, 1997
Author(s)
William F. Egelhoff Jr., P J. Chen, Cedric J. Powell, Mark D. Stiles, Robert McMichael, J Judy, K Takano, A. E. Berkowitz
We have found a novel method for increasing the giant Magnetoresistance (GMR) of Co/Cu spin valves with the use of oxygen. Surprisingly, spin valves with the largest GMR are not produced in the best vacuum. Introducing 5X10 -9 Torr (7X10 -7 Pa) into our

Micromagnetic Computational Standard Problem (Abstract)

April 1, 1997
Author(s)
Robert D. McMichael, Michael J. Donahue
Proposed solutions to a standard problem in micromagnetics that were collected anonymously from a number of researchers using a variety of computational techniques are presented. This is the first time that a problem in micromagnetics has been attempted by

Magneto-Optical Indicator Film Study of the Magnetization of a Symmetric Spin Valve

September 1, 1996
Author(s)
Valerian I. Nikitenko, V S. Gornakov, L M. Dedukh, Yury P. Kabanov, A F. Khapikov, Lawrence H. Bennett, P J. Chen, Robert D. McMichael, Michael J. Donahue, L Swartzendruber, Alexander J. Shapiro, H J. Brown, William F. Egelhoff Jr.
A magneto-optical indicator film (MOIF) technique is used for direct experimental study of the magnetization reversal process in a symmetric NiO/Co/Cu/NIFe/Cu/Co/NiO spin valve. It is shown for the first time that the reversal of the free center layer

Magneto-Optical Indicator Film (MOIF) Microscopy of Granular and Layer Structures (Abstract)

April 1, 1996
Author(s)
Valerian I. Nikitenko, V S. Gornakov, L M. Dedukh, A F. Khapikov, Lawrence H. Bennett, Robert D. McMichael, L Swartzendruber, Alexander J. Shapiro, Michael J. Donahue, V N. Matveev, V I. Levashov
We report on the possibilities of application of magneto-optical indicator film (MOIF) technique for visualization and direct experimental study in real time of the magnetization processes and nondestructive characterization of the quality of magnetic thin

Growth of Giant Magnetoresistance Spin Valves Using Pb and Au as Surfactants

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 Pb and Au as surfactants in an attempt to achieve smoother and sharper interfaces in three types of giant magnetoresistance (GMR) spin valve multilayers: symmetric spin valves, bottom spin valves, and top spin valves. The

Growth of GMR Spin Valves using Indium as a Surfactant

January 1, 1996
Author(s)
William F. Egelhoff Jr., P J. Chen, Cedric J. Powell, Mark D. Stiles, Robert McMichael
We have investigated the use of In as a surfactant to achieve smoother interfaces in spin-valve multilayers of the general type: FeMn/Ni 80Fe 20/Co/Cu/Co/Ni 80Fe 20/glass. The coupling field is reduced from 0.8 to 0.3 mT, presumably by suppressing
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