Results from on-Orbit Testing of the Fram Memory Test Experiment on the Fastsat Micro-Satellite

Prospects and applications near ferroelectric quantum phase transitions: a key issues review

“…These same acoustic phonons, in the absence of a ferroelectric phase transition, are the main contribution to the pyroelectric coefficient ∂P ∂T E ; it is expected to decrease sufficiently rapidly with decreasing temperature that ∂T ∂E S in (44) vanishes in the limit T → 0 [28]. Consistent with this argument, cryogenic studies of KT aO 3 and SrT iO 3 yielded negligible EC effects [126,127,128,129] and this approach to low temperature refrigeration has not been actively pursued for some time. So why then can magnetocaloric cooling be used routinely to access very low temperatures in complete contrast to its electric counterpart (to date)?…”

“…At first sight this dilutecarrier metal looks quite conventional with a resistivity that scales like T 2 as expected for a three-dimensional Fermi liquid [161]. The catch is that this behavior continues to temperatures well above the Fermi temperature T F [101,161] where T F is determined from the coefficient of the linear heat capacity; in 3d for fixed m, T F scales with n 2 3 . Arguments based on Fermi liquid, requiring that T << T F , are clearly inapplicable for T > T F ; furthermore A, the coefficient of this T 2 behavior in the resistivity, can change by four orders of magnitude by tuning the carrier concentration and persists to dilute limits where known mechanisms for T 2 behavior are no longer applicable [101].…”

“…Here we see that, setting the constants and k B to be unity, the important energy-scales are the temperature, T , and the oscillator frequency Ω. If T is much greater than Ω, then the variance in the amplitude, x 2 , scales with T and Ω drops out completely. In this case, the total variance results from purely classical (thermal) fluctuations and in Figure 1 their contribution to x 2 is indicated by a red line.…”

“…There are indeed similarities between ferroelectrics and ferromagnets, but there are also key differences. For example, the polarization is a classical object and thus is not [2,3] with permission and thanks to T.C. MacLeod; (Inset) Naval Postgraduate School scientists R. Panholzer and D. Sakoda with several structural pieces of Naval Postgraduate School Satellite 1 with FRAM [4] due to launch on a STP-2 mission in 2017 on a SpaceX Falcon Heavy rocket [5] (US Navy Photo by Javier Chagoya, reprinted from [4] with permission and thanks to J. Chagoya and the NPS Public Affairs Office).…”

Academy transaction note characterization of FRAM microcontrollers to radiations

“…To test the behaviour of FRAM devices in LEO satellites, we use the new FRAM based microcontroller MSP430FR6989 from Texas Instruments, developing a payload for a cubesat of the AraMiS-C1 family. Tests have already been performed on Ramtron FRAM memories on FASTSAT micro-satellite by NASA Marshall Space Flight Center [6] obtaining good results demonstrating radiation tolerance of FRAM. We are at the moment waiting for a launch opportunity to get live data and verify our assumption that FRAM based microcontrollers can be extremely useful in low cost university satellites.…”