Showing papers by "Barry L. Zink published in 2005"
TL;DR: In this paper, a method of measuring thermal conductivity of films as thin as 15 nm from 2-300 K and in magnetic fields up to at least 8 T using a silicon-nitride membrane based microcalorimeter is described.
Abstract: We describe a method of measuring thermal conductivity of films as thin as 15 nm from 2–300 K and in magnetic fields up to at least 8 T using a silicon-nitride membrane based microcalorimeter. The thermal transport in the membrane is measured before and after a sample film is deposited on the membrane. Accurate knowledge of the geometry of the microcalorimeter allows the thermal conductivity of the sample film to be determined from the difference of these measurements. We demonstrate the method for two thin film samples, a 16 nm thick Au film and a 200 nm Pb film. Results are in good agreement with the expected thermal conductivity. Below 10 K, surface scattering effects in the nitride membrane become important and limit the usefulness of this technique in some cases. Above 100 K radiative loss becomes important; we describe a method for correcting for this, taking advantage of its temperature dependence.
54 citations
TL;DR: In this paper, the authors used silicon micromachining techniques to fabricate devices for measuring specific heat or other calorimetric signals from microgram-quantity samples over a temperature range from 1.7 to at least 525 K in magnetic fields to date up to 8 T.
33 citations
01 Jan 2005
TL;DR: In this article, a gamma-ray microcalorimeter with a FWHM energy resolution of 42 eV at 103 keV on a gadolinium test source and 52 eV energy resolution on a complex mixture of plutonium isotopes is presented.
Abstract: We present measurements from a gamma-ray microcalorimeter with a FWHM energy resolution of 42 eV at 103 keV on a gadolinium test source and 52 eV FWHM at 103 keV on a complex mixture of plutonium isotopes. Additionally, we provide an overview of microcalorimeter technology, its specialized readout electronics, and the associated cryogenics. NIST is presently developing arrays of microcalorimeters and microbolometers for applications at submillimeter and X-ray wavelengths. The largest of these arrays will have 10,240 pixels and a sensing area of 102.4 cm2. This technology development is directly applicable to gamma-ray microcalorimeter arrays and we see no obstacles to gamma-ray microcalorimeter arrays of 100 or more pixels
1 citations