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Search Publications by: Pavel Kabos (Fed)

Displaying 201 - 225 of 261

Dielectric Characterization of Ferroelectric Ceramics with Sleeve Resonator Techniques at Microwave Frequencies

July 8, 2003

Author(s)

Richard G. Geyer, Pavel Kabos, James R. Baker-Jarvis

Temperature-stable, high-Q sleeve resonators may be used for variable temperature dielectric characterization of rod-shaped ferroelectric test specimens at microwave frequencies. The nominal measurement frequency is determined by the permittivity and

Iron and Permalloy Based Magnetic Monolithic Tunable Microwave Devices

May 15, 2003

Author(s)

Bijoy Kuanr, Leszek Malkinski, Robert E. Camley, Zbigniew Celinski, Pavel Kabos

We constructed a series of Magnetic Monolithic tunable Microwave notch-filters and phase shifters in co-planer waveguide (CPW) geometry on GaAs substrates using Fe and Permalloy as magnetic materials. In contrast to previous work with Molecular Beam

Measuring the Invasiveness of High-Impedance Probes

May 14, 2003

Author(s)

Uwe Arz, Pavel Kabos, Dylan Williams

We use on-wafer measurements to characterize the invasiveness of high-impedance probes over a broad frequency range. We show that a two-port representation characterizing the invasiveness of the probe can also be determined from a calculation of the probe

Nonlinear magnetooptic measurement of flux propagation dynamics in thin Permalloy films

March 12, 2003

Author(s)

Thomas J. Silva, Matthew Pufall, Pavel Kabos

Time-resolved nonlinear optics are used to study the propagation of magnetic flux pulses in a 250 nm Permalloy film. The flux is generated in the film by coupling it to a coplanar waveguide structure driven with broadband voltage pulses. Flux pulses

Calibrated Waveform Measurement with High-Impedance Probes

February 1, 2003

Author(s)

Pavel Kabos, Howard C. Reader, Uwe Arz, Dylan Williams

We develop an on-wafer waveform calibration technique that combines frequency-domain mismatch corrections to account for the effects of the probe on the measurement with an oscilloscope calibration. The mismatch correction is general and can be applied to

Pulsed inductive microwave magnetometer

October 1, 2002

Author(s)

Anthony B. Kos, Thomas J. Silva, Pavel Kabos

We describe the apparatus, software, and measurement procedures for a pulsed inductive microwave magnetometer (PIMM). PIMM can measure the dynamical properties of materials used in recording heads for magnetic storage applications and it can be used as a

Detection of coherent and incoherent spin dynamics during the magnetic switching process using vector-resolved nonlinear magneto-optics

September 16, 2002

Author(s)

Thomas J. Silva, Pavel Kabos, Matthew Pufall

It is usually assumed that magnetic switching proceeds via coherent rotation under conditions of high symmetry. There is no a priori reason to expect an inhomogeneous response when a uniform magnetic torque is applied to a homogeneous ferromagnet. We test

Dielectric Sleeve Resonator Techniques for Variable-Temperature Microwave Characterization of Ferroelectric Materials

June 7, 2002

Author(s)

Richard G. Geyer, Pavel Kabos, James R. Baker-Jarvis

Low loss sleeve resonators can be used for accurate microwave dielectric characterization of rod-shaped test specimens. The test specimen is inserted into the dielectric sleeve resonator and placed centrally in a metal cavity. With the use of additional

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

Design and performance of an inductive current probe for integration into the trace suspension assembly

January 1, 2002

Author(s)

Anthony B. Kos, Thomas J. Silva, Pavel Kabos, Matthew Pufall, Donald C. DeGroot, L Webb, M Even

A low-cost, inductive current probe designed for integration into a disk drive trace suspension assembly is described. The main consideration for this design was to use the same materials currently found in trace suspension assemblies, and thus reducing

Wideband Frequency-Domain Characterization of High-Impedance Probes

November 30, 2001

Author(s)

Uwe Arz, Howard C. Reader, Pavel Kabos, Dylan F. Williams

In this paper we investigate the broadband microwave properties of high-impedance probes designed for on-wafer waveform measurements. We show that the standard two-tier characterization method fails. We introduce two new methods of characterization, both

Surface magnetic phase diagram for a semi-infinite ferromagnet

October 12, 2001

Author(s)

Pavel Kabos, David P. Pappas

The phase diagram for the orientation of the surface region is calculated in the parameter space defined by the surface and bulk anisotropy in semi-infinite ferromagnetic systems and in thin ferromagnet films. Surface magnetic canting always occurs when

Dielectric Sleeve Resonator Techniques for Microwave Complex Permittivity Evaluation

October 1, 2001

Author(s)

Richard G. Geyer, Pavel Kabos, James R. Baker-Jarvis

Closed-form analytical solutions are derived for accurate microwave dielectric characterization of rod test specimens inserted into dielectric sleeve resonators placed certrally in a metal cavity. Low-loss sleeve resonators can be used advantageously for