arXiv subjects

E. H. Lock

Publications and source records attributed to E. H. Lock.

3 recordsLinked to original sources

arXiv2017

Superdirectional Beam of Surface Spin Wave

The visualized diffraction patterns of surface spin wave excited by arbitrarily oriented linear transducer are investigated experimentally in the plane of tangentially magnetized ferrite film for the case where the transducer length D is much larger than the wavelength L. It is shown experimentally and theoretically that the angular width of diffracted surface spin wave beam in anisotropic ferrite film can take values greater or less than L/D and can also be zero. For the last case superdirectional (nonexpanding) beam of the surface spin wave is observed experimentally: the smearing of the beam energy along the film plane is absent and the length of the beam trajectory is maximal (~50 mm).

physics.optics↗

arXiv2014

Superconducting TiN Films Sputtered over a Large Range of Substrate DC Bias

We have investigated properties of superconducting titanium nitride (TiN) films that were sputtered over a large range of RF-induced DC bias voltage applied to the substrate. Films grown with the largest bias voltages contained cubic TiN phases with a large fraction of the (200) crystalline growth orientation. These films also contained the smallest concentrations of oxygen impurities, resulting in stoichiometric TiN. Over the range of bias, variations of the stress from slightly tensile to highly compressive were measured and correlated to crystallinity of the (200) growth. The films exhibited highly uniform thickness and resistivity, and show the potential for yielding reproducible low-temperature devices. Finally, coplanar resonators fabricated with the films exhibited high kinetic inductance and quality factor, where the latter was obtained in part from temperature-dependent frequency shifts.

cond-mat.supr-con↗

arXiv2005

Unidirectional Magnetostatic Waves

Dispersion characteristics of magnetostatic waves in tangentially magnetized to saturation ferrite film with a "magnetic wall" condition (tangential component of microwave magnetic field is equal to zero) on the one of the film surface were calculated. It is found, that unidirectional magnetostatic waves appear in this geometry: they can transfer energy only in one direction and fundamentally cannot transfer energy in an opposite direction.

physics.class-ph↗