Magnetic Material Testing Laboratory
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Vibrating Sample Magnetotometer
(VSM)
A Digital Measurement System Model 1660 is available for
testing magnetic properties of small samples. It is fully software-controllable,
with a maximum field capability of 13,500 Oe. The system is also
capable of measuring magnetic hysteresis over a range of sample
temperature.
Cahn Model 4700 Automatic Electrobalance
This precision instrument is designed to weigh samples up to 2.5
grams and is sensitive to weights as small as 100 nanograms.
Supporting equipment
The laboratory is fully equipped with multimeters, a multifunction
synthesizer, and various tools. |
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Magnetic Refrigeration Research Laboratory
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The purpose of this laboratory is to develop a magnetic
refrigeration system that can operate in the range of ambient atmospheric
temperatures and to determine the applicability of magnetic refrigeration
to practical consumer refrigeration systems. The potential advantages
of such a system are the prevention of environmental damage caused
by harmful working fluids involved in existing systems and the reduction
of energy consumption resulting from the significantly improved
energy efficiency inherent in the utilization of the magneto-caloric
effect. Magnetic refrigeration offers a significantly different
thermodynamic approach than existing compression refrigeration system
since it does not depend upon a condensable working fluid. Successful
application to automotive air conditioning would have an environmental
benefit by reducing engine load and saving fuel while employing
no environmentally damaging working fluids.
The objective of this research facility is to investigate the choices
of materials, heat exchange arrangements and the fluid that will
be explored for the various applications of magnetic refrigeration.
Relevant equipment includes:
- Magnetic Solutions Model SMM-2000-26.5 produces a magnetic
field with an absolute magnitude varying between 0 and 2 Tesla
at up to 2 Hertz.
- LakeShore Model 460 3-Channel Gaussmeter
- Keithley Model 2700 Multimeter / Data Acquisition System
- Stanford Research Systems Model SR530 Lock-in Amplifier
- Vacuum Pump
- Circulation Pump
- KSE Drybox
- Chemical Hood
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Magneto-Optics Laboratory |
The Institute for Magnetics Research has constructed
a light-proof laboratory for carrying out magneto-optical research
programs. Capabilities include both linear and second-order magneto-optical
Kerr effect (MOKE) measurements at wavelengths from 600 to 1000
nm. The system is computer controlled, and fully integrated with
a Joule-Thompson refrigeration chamber to enable MOKE measurements
over sample temperatures from +100C to -196C. Work is currently
underway to incorporate an electrochemical deposition chamber with
the MOKE system to allow in situ measurements of Kerr rotation and
ellipticity during the preparation of thin film and multilayer samples
Relevant equipment includes:
- Aerotech Model LSR5P 5 mW He-Ne Laser (wavelength= 632 nm)
- Hinds Instruments Model II/CF57 Calcium Fluoride Photoelastic
Modulator (PEM)
- Model 7280 Wide Bandwidth (2 MHz) DSP Lock-in Amplifier with
Dual/Single Harmonic and Reference Modes
- Walker Scientific Model HV-5H Electromagnet with 5"
poles and maximum magnetic field of 16,000 Gauss
- Applied Magnetics Model MC-50 Bipolar Electromagnet Power
Supply
- LakeShore Model 450 Gaussmeter
- MMR micro miniature Joule-Thomson refrigerator with programmable
temperature controller.
General MOKE (linear) Measurements
Temperature-Dependent Measurements
Optically transparent sample holder/refrigeration
Second-Order MOKE (non-linear) Measurements
- Coherent Model Mira 900 femtosecond modelocked Titanium: Sapphire
Laser (wavelength= 700 nm to 1000 nm)
- Coherent Model Verdi solid-state diode pumped Nd: YVO4 Laser
(wavelength=532 nm)
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