Att (1) Specifications.docx

N00173-20-R-AM03

ATTACHMENT (1)

Sample size, mount

· Up to 5 mm by 5 mm by 1 mm thick

· Mounted on coplanar waveguide for FMR measurements

· Peak to peak vibration less than 200 nanometers while cryocooler is operating

Temperature range / stability

· 10K to 350K with less than 50 milli-Kelvin peak-to-peak variations

· cooling time from room temperature to 10K not to exceed 120 minutes

Magnetic field range and control

· bipolar field control with continuous sweep through zero field

· plus / minus 7000 Oersted range with 12 mm magnet pole spacing

· field resolution plus / minus 0.25 Oersted

Electrical connections

· four electrical feedthroughs capable of 20 GHz transmission

FMR operation

· frequency range: minimum freq of 2 GHz, maximum freq of at least 17 GHz

· AC field modulation up to 1 Oersted

Operating and analysis software System shall include software to provide

· computer control of temperature, magnetic field and frequency.

· Acquisition of FMR spectra at a fixed frequency while varying the temperature

· real time display of FMR spectra during acquisition

· determination of resonance field and linewidth from FMR spectra

· data analysis to extract saturation magnetization, Gilbert damping constant

· plotting of FMR spectra, linewidth vs temperature and frequency, resonance field vs temperature and frequency, Optical access

· Three optical ports along two orthogonal axes (horizontal and vertical) to permit optical access to the sample from the top along the vertical axis and along the horizontal axis

· each port shall have a 1 inch outer window and a cold inner window which is 0.5” in diameter or greater

· top port shall be adjustable to provide for a short optical working distance of 5 mm when needed, defined as the distance from the sample surface to the collection lens of the NRL-supplied optical system external to the sample space (this would typically be a microscope objective)

· window material to be fused silica for optimal transmission from 400-1000 nm

· system shall provide for plus/minus 10 mm manual translation of the sample along the x,y horizontal axes relative to the vertical optical access with 1 micron resolution

· the basic FMR spectrometer (defined to be the variable temperature sample space with coplanar waveguide, optical access, and magnet) shall have a footprint no larger than 24” tall by 24” wide by 30” long so that it can be mounted on a standard optical table (provided by NRL) and interfaced to existing optical spectroscopic equipment (provided by NRL). The FMR / cryostation control electronics and closed cycle cryo-compressor can be floor mounted.