Radiant Technologies, Inc. Ferroelectric Test & Technology

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Presentation transcript:

Radiant Technologies, Inc. Ferroelectric Test & Technology Joe T. Evans, Jr. August 22, 2016

Radiant Technologies Focus on non-linear electromechanical materials technology. The company Designs and manufactures test instruments and their operating procedures Fabricates thin ferroelectric film devices Integrates the two disciplines to create unique functions.

Test Instruments Radiant pioneered ferroelectric test with the development of the first commercial test system in 1989 and now makes a variety of testers and fixtures.

Test Instrument vs Integrated Ferroelectrics What follows is a series of measurements demonstrating the properties of Radiant’s thin PZT capacitors measured with Radiant test equipment.

IC Scale Cryogenic Testing Lakeshore CRM-EM-HF

IC Scale Cryogenic Testing 0.25m-thick PZT from 10 K to 310 K

Quantum Design PPMS P450 The QD Model P450 Multifunction Probe can test disc-shaped bulk capacitors at high voltage down to 2.4 K. B

Bulk Capacitors vs Temperature Many surprises await at lower temperatures. The sample to the right is a commercial piezoelectric PZT from CTS Wireless in Albuquerque measured in a PPMS that indicates a normal hysteresis loop at room temperature but unexpectedly has no remanent polarization at 100 K.

Leakage vs CV vs Remanent Polarization Decomposing the hysteresis loop on a probe station.

High Voltage Polarization & Piezeoelectric Loops Bulk Capacitor displacement at high voltage and elevated temperature.

Thin Film Polarization & Piezeoelectric Loops The laser vibrometer can measure the piezoelectric motion of a thin ferroelectric film capacitor

Thin Solid Capacitor Piezo Loop AFMs work too. Surface piston of the 1µm-thick PNZT at 25 volts and 500 hertz using an AFM. The capacitor is clamped by the substrate.

Thin Film PZT on Cantilever Capturing e31 for a thin film on a cantilever surface is a 3rd technique.

Ferroelectric Transistor Operation PZT InOx Source & Drain Gate

Radiant Technologies Integrated thin-ferroelectric-film capacitors. Radiant has developed a manufacturable process for discrete ferroelectric capacitors. Radiant inserts packaged capacitors into its testers as test references. Radiant processes thin PZT film wafers and devices for researchers studying non-linear materials.

Membrane Capacitors A three micron membrane with an embedded 1m-thick PNZT capacitor.

Membrane Capacitors Remanent strain movie if the same capacitor.

pMEMs Devices We have work still to do to reliably generate reproducible devices. .

Mechanically Coupled Capacitors 1.2mm DRIVE RETURN GND Sensor Actuator

1 mm2 Membrane White Light Numarski A 1-square-millimeter capacitor with the majority of its surface as a membrane. In white light the membrane looks smooth but in Numarski the membrane is unmistakable.

16mm2 Membrane A 16 square millimeter membrane soldered directly to a PCB with an on-board charge amplifier that connects to the Radiant EDU educational tester using telephone cable. Pyroelectric constant is -22nC/cm2/K. The membrane is too fragile to be touched by a human.

Autonomous Analog Switch This entire PCB with discrete components and a packaged ferroelectric capacitor can be shrunk into the same solid state switch package on the PCB in the left image. This circuit can stand-alone and resist disturbs from dramatic power-line voltage events.

“A Simple Ferroelectric Memory” Nuts & Volts Magazine “A Simple Ferroelectric Memory” February 2015 Issue

Ferroelectric Circuits Autonomous Event Detector Ferroelectric Capacitor Input Overvoltage Protection Output Buffer Autonomous Memory Event Input Line

Demo Board - Piezo Piezo Flapper Event Detector Latch This piezoelectric flapper is a Measurement Specialties, Inc. LDT0-28K Piezo Film Sensor. Bent 90 degrees, it generates exactly 7nC of charge, precisely the amount required to saturate one of Radiant’s Type AB 20/80 PZT or Type AD 3/20/80 PNZT thin film capacitors. The Radiant ferroelectric capacitor is encased in the TO-18 transistor package on the Event Detector board.

Magnetoelectric Sensor Deposit magnetically sensitive material on membranes to make magnetic field sensors. Below are dice from a wafer prepared for this experiment but which have not yet seen the backside DRIE. This project, executed in a CRADA with SPAWAR, is difficult!

Best Magnetoelectric Response (so far)

Autonomous Event Detector Set by a Magnetic Field? Can we magnetomechanically switch the ferroelectric capacitor and control the switch?