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Search Publications by: Robert D. McMichael (Assoc)

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Displaying 176 - 200 of 314

Magnetization Dynamics Modeled in Magnetic Thin Films

March 1, 2003
Author(s)
Robert D. McMichael
One of the challenges facing designers of high data rate computer hard drives and magnetic memory chips is that for most magnetic metals, it typically takes a fewnanoseconds for the magnetization to come to rest after it has been switched or bumped by a

Ru Spacer Thickness Dependences of the Domain Nucleation and Growth in Co/Ru/Co Synthetic Antiferromagnet

March 1, 2003
Author(s)
V S. Gornakov, Valerian I. Nikitenko, William F. Egelhoff Jr., Robert D. McMichael, Alexander J. Shapiro, Robert D. Shull
The relative orientation of Co magnetization vectors in a Co/Ru/Co/Ta structure vary gradually from parallel to antiparallel orientation as a function of Ru thickness varying from 0 nm to 1.0 nm. At intermediate average Ru thicknesses from 0.2 nm to 0.35

High-speed switching and rotational dynamics in small magnetic thin-film devices

January 1, 2003
Author(s)
Stephen E. Russek, Shehzaad F. Kaka, Robert McMichael, Michael J. Donahue
The intent of this chapter is to review high frequency magnetic device measurements and modeling work at NIST which is being conducted to support the development of high-speed read sensors, magnetic random access memory, and magnetoelectronic applications

Magnetic Properties of Ultrathin Laminated Co/Cu Films Prepared by Electrodeposition

September 1, 2002
Author(s)
M Shima, L Salamanca-Riba, Thomas P. Moffat, Robert D. McMichael
The magnetic properties of a series of electrodeposited [Co(x ML)/Cu(17 ML)]100 multilayers have been examined as a function of the cobalt layer thickness. The multilayers were grown on Si(100)covered with a highly textured Cu(100) seed alyer. Films with a

Normal Mode Mixing and Ferromagnetic Resonance Linewidth

September 1, 2002
Author(s)
A B. Kunz, Robert D. McMichael
This spin wave modes for a uniform film are perturbed by the inclusion of inhomogeneities into the system. The resulting perturbed Hamiltonianis diagonalized to create a new set of spin waves modes. The effect of the strength of the perturbations is

Anomalous Switching Behavior of Antiparallel-Coupled CO Layers Separated by a Super-Thin Ru Spacer

May 15, 2002
Author(s)
V S. Gornakov, Valerian I. Nikitenko, William F. Egelhoff Jr., Robert D. McMichael, Alexander J. Shapiro, Robert D. Shull
The details of the magnetization reversal mechanisms upon field reversal in coupled ferromagnetic CO (2.5 nm)/Ru(0.5 nm)/Co (2.6 nm) trilayers deposited on obliquely sputtered Ta (10.6 nm) underlayers were studied using the magneto-optical indicator film

Magnetostriction and angular dependence of FMR linewidth in Tb-doped Ni 0.8 Fe 0.2 thin films

May 15, 2002
Author(s)
Stephen E. Russek, Pavel Kabos, Robert McMichael, C G. Lee, William E. Bailey, R Ewasko, S. Sanders
We present the dependence of the magnetostriction in Ni 0.8Fe 0.2 films on Tb and Gd doping concentration with the measured doping dependence of the high-frequency damping. While the magnetostriction and the high-frequency damping are correlated, the

Ferromagnetic Resonance Mode Interactions in Periodically Perturbed Films

May 1, 2002
Author(s)
Robert McMichael, D J. Twisselmann, John E. Bonevich, P J. Chen, William F. Egelhoff Jr., Stephen E. Russek
rromagnetic resonance linewidth measurements are reported for thin films of Ni 80Fe 20 deposited on substrates with 320 nm period grooves or parallel aperiodic scratches. These films are model systems for studying the effects of inhomogeneity on

Structural Magnetic and Thermal Stability of IrMn Exchange Biased Layers

May 1, 2002
Author(s)
Chang H. Lee, J G. Jung, Robert D. McMichael, R A. Fry, Andrew P. Chen, William F. Egelhoff Jr., V S. Gornakov
The magnetic domain structure, magnetic properties and thermal stability of IrMn biased top spin valves containing Co and NiFe have been investigated. The magneto-optical indicator film (MOIF) pictures of NiFe biased IrMn spin valve showed the formation

Features of Domain Nucleation and Growth in Co/Ru/Co Synthetic Antiferromagnets Deposited on Obliquely Sputtered Ta Underlayers

February 1, 2002
Author(s)
Alexander J. Shapiro, V S. Gornakov, Valerian I. Nikitenko, Robert D. McMichael, William F. Egelhoff Jr., Y W. Tahk, Robert D. Shull, L Gan
Obliquely sputtered Ta underlayers were used to stabilize antiferromagnetically couple Co/Ru/Co/Ta structures with a strong uniaxial anistropy. Magneto-optical indicator film (MOIF) imaging revealed nucleation and growth of domains during remagnetization