Electron Beam Evaporator
The electron-beam evaporator is used for depositing thin films of various metals (Ni, Au, Ge, etc.). These are used to make ohmic contacts or can serve as electrodes in semiconductor structures or other materials that are being studied in PCCM projects. The evaporator is in J414 Engineering Quadrangle, near the PRISM cleanroom.
Instron 8501 Servohydraulic Mechanical Testing Apparatus
This mechanical testing machine has been purchased jointly with the Department of Mechanical and Aerospace Engineering for use in undergraduate and graduate education projects as well as for some independent work and research applications. The facility, located in J213 of the Engineering Quadrangle, is capable of making tensile, compression, and periodic (fatigue) tests on a wide range of materials. As presently configured with a 100 kN load cell, 30 kN capacity tensile grips, 100 kN compressive loading tables, and a 50 kN three point bending jig, the equipment is best applied to metals and composite materials. These measurements must presently be made under ambient conditions. In addition to these standard testing configurations, special fixtures are fabricated for making mechanical tests on components such as spring/shock absorber assemblies or fatigue tests on bicycle spokes. With the addition of different load cells and environmental chambers this basic apparatus may be extended for studies of ceramics and metals at high temperatures, or polymeric samples under different humidity conditions and temperatures.
In order to make the equipment readily available to students and staff, a hypertext notebook has been prepared which is available on the web as well as on the computer dedicated to controlling the 8501. This provides a step-by-step introduction to the safe operation of the equipment and an explanation of the functions of its components. Data acquisition and manipulation is directly controlled from this "Interactive Laboratory Notebook."
Quantum Design MPMS SQUID Magnetometer
The SQUID magnetometer (Quantum Design) is a PCCM supported instrument located in Jadwin Hall, Room 105. The system measures the magnetization M of samples as a function of applied field H up to a maximum field of 5 Tesla. In high-resolution mode, M may be measured to a resolution of ±10-8 emu. Temperature regulation has been improved by a recent upgrade. The temperature may be stabilized to 0.1 K over the range 2 K to 400 K. The system may be programmed to perform measurements overnight. Samples investigated include magnetic materials, ceramics, novel superconductors, nanoparticles, and spin-valve devices. While this is not a general purpose instrument, users from other MRSECs may obtain access to the magnetometer by special arrangement.
Point-Focusing Small-Angle X-Ray Scattering (SAXS) System
The Molecular Metrology point-focusing small-angle x-ray scattering (SAXS) system, in A414 Engineering Quadrangle, is capable of making measurements on oriented or unoriented materials at scattering angles which cover the range of Bragg spacings from 0.7 to 100 nm. This high-resolution system is particularly well-suited to the characterization of materials created through guided self-assembly. The instrument employs Cu Kα1 radiation from a sealed-tube generator (PANalytical PW3830), focused in the vertical and horizontal directions by separate, bent Si (111) crystals. The two-dimensional multiwire Xe-filled detector is of the Gabriel design, with a maximum count rate of 105/sec. SAXS patterns can also be acquired on Kodak image plates. The entire beampath is evacuated, including the large sample chambers, which have feedthroughs to control a variety of sample environments. Sample heating to 300oC and cooling to -10oC, as well as temperature scanning with a Linkam DSC600 hot stage, are presently possible.
High Temperature Vacuum Furnace
This is a general use laboratory furnace (Materials Research Furnaces) for heating bulk specimens to high temperatures in the absence of air. Located in Frick A09, it is outfitted with a diffusion pump to continuously evacuate the sample chamber, and is suitable for the synthesis of metals, semiconductors, and other nonvolatile compounds. It may also be used for treatment of nonvolatile air-sensitive parts in a vacuum at high temperature. The furnace is supplied with a hot-press kit for densifying refractory specimens, and also with a crystal growth attachment. It is a unique resource for the Princeton materials community.
Electrically Guided Self-Assembly Imaging System
The dynamics of electrically guided self-assembly with colloidal dispersions and mesoscopic silica are studied via the Zeiss Axioplan 2 and AxioCam HR imaging system located in the Engineering Quandrangle, Room G106. The Axioplan 2 can resolve 1 µm particles; the AxioCam HR provides high resolution full-color images. To observe electric field effects on self-assembled systems, the fully-motorized stage has been modified to accommodate fluid cells. Specially designed image collection and processing software enables time-lapse data collection and particle velocity measurement. The applied potential and current can be tracked in real time. Various attachments permit the tracking of fluorescing particles.
The Kurt Lesker PVD 75 sputtering system, housed in Jadwin Hall Room B8, is capable of depositing both metallic and insulating films, depending on the sputtering target employed. Currently, Ni, Co, Cu, Mo, Si, Ge, and permalloy targets are available. In the past year, we have been testing and improving the system by growing Cu and MoGe films in the range 30-400 nm.