Image: characterising BFO at 20nm/50nm thicknesses on varying oriented substrate.**īiFeO 3 (or BFO) boasts an impressive resume of multifunctional properties, including piezoelectricity, ferroelectricity, magnetism, and optical properties.īFO is arguably the most popular magnetoelectric material for researchers (ie, a material that has both magnetic and electrical ordering that can influence each other). It’s magnetoelectric, it’s piezoelectric, it’s photovoltaic… it’s greased lightning!īFO’s impressive range of magnetoelectric properties-including piezoelectricity, ferroelectricity, magnetism, and optical properties-make it a popular material for researchers investigating spintronics, memory applications and low-energy technologies. This means that the strain applied is different depending on which direction you’re looking, and this can create complicated strain states that force films into new phases,” says first author Oliver Paull (UNSW). “In our research, we applied anisotropic strain to our film. On the other hand, a smaller substrate structure cell (green square) will cause the film structure to be compressed horizontally (‘compressive strain’) and stretched vertically. If the structural units of the substrate are larger than those of the thin film (the blue square), the film (white outline) will stretch horizontally (ie, ‘tensile strain’) and compress vertically to fit. When we strain thin films on substrates, the building blocks of the film will deform to match the sizes of the building blocks of the neighbouring substrate. When we impose strain on a material, we are usually pushing together or pulling apart along (at least) one axis, creating compressive and tensile strain. We utilise this in everyday technology, using external stimuli to bend material properties at will. When we apply stress to crystals, they become strained and can change their structure and physical properties dramatically. Even the most ‘together’ person can struggle and change given enough stress in their life. If 2020-21 has taught us anything, it’s that stress changes everything. Right: A smaller substrate structure cause the film to be compressed horizontally and stretched vertically. ![]() Left: If structural units of the substrate (coloured squares) are larger than those of the thin film (empty squares), the film stretches horizontally and compresses vertically. The direction of deformation of a thin film depends on its relative structural size compared with the substrate beneath. The theoretical and experimental US-Australian study shows that this new phase has an electromechanical figure of merit over double its usual value, and that we can even transform between this intermediate phase to other phases easily using an electric field.Īs well as providing a valuable new technique to the toolkit of all international material scientists working with multiferroics and epitaxy, the results finally shed light on how epitaxial techniques can be used to enhance functional response of materials for future application in next -generation devices. UNSW researchers find a new exotic state of one of the most promising multiferroic materials, with exciting implications for future technologies using these enhanced properties.Ĭombining a careful balance of thin-film strain, distortion, and thickness, the team has stabilised a new intermediate phase in one of the few known room-temperature multiferroic materials. Stress enhances the properties of a promising material for future technologies. I now still have the need to plug it in at the start of setting up for a gig, and by the time I'm ready to play, so is the variax.Lead-author Dr Daniel Sando preparing materials for study at UNSW, Sydney This fixed the problem (or so I thought), for a while. I thought the piezos must be dodgy, so replaced the lot with Graphtech Ghosts. After some time being plugged in, (maybe 30 minutes or so), they would begin operating normally. I have since realised this odd phenomenon could be explained by the vibrations of those two strings being picked up by the G (and maybe other) piezos. I experienced soon after buying it, the first E and B strings would not be audible through the Pod HD500, although the strings could be tuned using the onboard tuner. I asked about this same type of problem on a second hand Variax 300 I bought around 2-3 years ago, and really didn't receive much in the way of relevant/possible reasons for the symptoms I was experienceing. Not be stable and would drift way too much. ![]() Piezo electric devices such as watch crystals, system clocks for electronics and such,Īre encased and sealed so as to not be affect by temperature. Line 6 authorized service tech will know how to deal with it. ![]() first suspect would be a solder point oxidizing and failing
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