Markys Cain | Queen Mary, University of London (original) (raw)
Papers by Markys Cain
Advances in Applied Ceramics, Mar 1, 2010
Abstract We present a computer simulation and theoretical study of composite multiferroics acting... more Abstract We present a computer simulation and theoretical study of composite multiferroics acting as magnetic field detectors. Our set? up consists of a layer of piezoelectric sandwiched between two magnetostrictive layers. When magnetic field is applied the magnetostrictive strains and this is passed onto the piezoelectric producing a detectable voltage. We model the device using our own finite element code and calculate open circuit voltage and input impedance. Good agreement is shown with analytical formulas. We then ...
Journal of Applied Physics, Aug 15, 2010
Journal of Applied Physics, Aug 14, 2014
Applied Physics Letters, Apr 5, 2010
The temperature dependence of the strain, electric field, and polarization of lead zirconate tita... more The temperature dependence of the strain, electric field, and polarization of lead zirconate titanate ceramic under unipolar electric fields up to 1.3 kV mm−1 from −50 °C up to +200 °C is reported. An electrostrictive model is shown to describe the response to high levels of induced polarization and electric field below and above the ferroelectric to paraelectric transition. This is despite nonlinearity and hysteresis in the strain–field response. A linear strain–polarization response is shown to be an approximation to a quadratic electrostriction which is invalid at higher temperatures while the electrostriction holds across the temperature range.
Materials Letters, 2012
Magneto-electric (ME) effects in bi-layer multiferroics consisting of single crystal hexagonal Sr... more Magneto-electric (ME) effects in bi-layer multiferroics consisting of single crystal hexagonal SrAlxFe12− xO19 ferrites (hexaferrites, where x= 0, 0.8, 1.2) and PbZrTiO3 (PZT) have been studied. The main objective of the study was to determine the effect of the Al doping concentration on the ME coupling. We experimentally demonstrate that the Al doping improves dramatically the magnetically induced ME voltage. Moreover, our data indicate that the ME response is a linear function of both ac and dc applied magnetic fields. This is in ...
The effects of electrical and mechanical cyclic stress on various PZT materials and devices were ... more The effects of electrical and mechanical cyclic stress on various PZT materials and devices were assessed using several techniques. Material parameters sensitive to the application of cyclic stress include permittivity, dielectric loss, coupling factors and piezoelectric coefficients. The direct observation of the performance of piezoelectric materials and devices, has shown that acoustic emission offers the most promise for an effective monitoring probe. 4 refs.
Journal of Applied Physics, Apr 1, 2011
Springer eBooks, 2014
This chapter provides detail of standards-related activities for piezoelectric materials—mainly b... more This chapter provides detail of standards-related activities for piezoelectric materials—mainly bulk ceramic types. The production of standards, particularly international ones, is a long process. The existence or not of a standard in a particular area is not solely because of the need for such a standard, but is due to the concerted effort of individuals. Documents must be kept current, and may be withdrawn or cancelled if there is nobody prepared to maintain it after publication. There are strong groups for piezoelectric materials standards in Europe (CENELEC) and America (IEEE-UFFC), but some of the most quoted standards have been withdrawn (IEEE 176-1987 [1], IEEE 180-1986, MIL-STD 1376B (SH)). An updated and regularly reviewed set of standards can be found at http://www.piezoinstitute.com.
Advances in Applied Ceramics, Mar 1, 2010
Journal of physics, Nov 29, 2013
ABSTRACT A vertical levitation electrostatic comb drive actuator was manufactured for the purpose... more ABSTRACT A vertical levitation electrostatic comb drive actuator was manufactured for the purpose of measuring piezoelectric coefficients in small-scale materials and devices. Previous modelling work on comb drive levitation has focussed on control of the levitation in standard poly-silicon devices in order to minimize effects on lateral modes of operation required for the accelerometer and gyroscope applications. The actuator developed in this study was manufactured using a 20 μm electroplated Ni process with a 25 μm trench created beneath the released structure through chemical wet etching. A finite element analysis using ZINC was used to model electrostatic potential around a cross section of one static and one movable electrode, from which the net levitation force per unit electrode was calculated. The model was first verified using the electrode geometry from previously studied systems, and then used to study the variation of force as a function of decreasing substrate-electrode distance. With the top electrode surfaces collinear the calculated force density is 0.00651 epsilon0V2Mμm-1, equivalent to a total force for the device of 36.4 μN at an applied voltage of VM=100 V, just 16% larger than the observed value. The measured increase in force with distance was smaller than predicted with the FEA, due to the geometry of the device in which the electrodes at the anchored ends of the supporting spring structure displace by a smaller amount than those at the centre.
Journal of the American Ceramic Society, Apr 1, 2014
ABSTRACT Single crystal (1 − x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 [PMN–xPT] (x = 0.32) is a relaxor-ferroel... more ABSTRACT Single crystal (1 − x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 [PMN–xPT] (x = 0.32) is a relaxor-ferroelectric material known to exhibit ‘giant’ piezoelectric behavior, with achievable strains in excess of 1% for samples of certain particular crystallographic orientations and chemical compositions close to the morphotropic phase boundary. In this study, we investigate the electric field-induced structural phase transitions in single crystal PMN–0.32PT with time-of-flight neutron diffraction and macroscopic electrical polarization measurements, and show that both the frequency of the applied ac field and the temperature of the sample are critical factors in determining these phase transition fields.
Journal of the American Ceramic Society, Jul 1, 2008
Ferroelectrics, Oct 21, 2008
This guide is intended to help people wanting to do finite element analysis of piezoelectric mate... more This guide is intended to help people wanting to do finite element analysis of piezoelectric materials by answering some of the questions that are particular to piezoelectric materials. The document is not intended as a complete beginners guide for finite element analysis in general as it is better dealt with by the individual software producers. The guide is based around the commercial package ANSYS as this is a popular package amongst piezoelectric material users, however much of the information will still be useful to users of other finite element codes.
Advances in Applied Ceramics, Mar 1, 2010
Abstract We present a computer simulation and theoretical study of composite multiferroics acting... more Abstract We present a computer simulation and theoretical study of composite multiferroics acting as magnetic field detectors. Our set? up consists of a layer of piezoelectric sandwiched between two magnetostrictive layers. When magnetic field is applied the magnetostrictive strains and this is passed onto the piezoelectric producing a detectable voltage. We model the device using our own finite element code and calculate open circuit voltage and input impedance. Good agreement is shown with analytical formulas. We then ...
Journal of Applied Physics, Aug 15, 2010
Journal of Applied Physics, Aug 14, 2014
Applied Physics Letters, Apr 5, 2010
The temperature dependence of the strain, electric field, and polarization of lead zirconate tita... more The temperature dependence of the strain, electric field, and polarization of lead zirconate titanate ceramic under unipolar electric fields up to 1.3 kV mm−1 from −50 °C up to +200 °C is reported. An electrostrictive model is shown to describe the response to high levels of induced polarization and electric field below and above the ferroelectric to paraelectric transition. This is despite nonlinearity and hysteresis in the strain–field response. A linear strain–polarization response is shown to be an approximation to a quadratic electrostriction which is invalid at higher temperatures while the electrostriction holds across the temperature range.
Materials Letters, 2012
Magneto-electric (ME) effects in bi-layer multiferroics consisting of single crystal hexagonal Sr... more Magneto-electric (ME) effects in bi-layer multiferroics consisting of single crystal hexagonal SrAlxFe12− xO19 ferrites (hexaferrites, where x= 0, 0.8, 1.2) and PbZrTiO3 (PZT) have been studied. The main objective of the study was to determine the effect of the Al doping concentration on the ME coupling. We experimentally demonstrate that the Al doping improves dramatically the magnetically induced ME voltage. Moreover, our data indicate that the ME response is a linear function of both ac and dc applied magnetic fields. This is in ...
The effects of electrical and mechanical cyclic stress on various PZT materials and devices were ... more The effects of electrical and mechanical cyclic stress on various PZT materials and devices were assessed using several techniques. Material parameters sensitive to the application of cyclic stress include permittivity, dielectric loss, coupling factors and piezoelectric coefficients. The direct observation of the performance of piezoelectric materials and devices, has shown that acoustic emission offers the most promise for an effective monitoring probe. 4 refs.
Journal of Applied Physics, Apr 1, 2011
Springer eBooks, 2014
This chapter provides detail of standards-related activities for piezoelectric materials—mainly b... more This chapter provides detail of standards-related activities for piezoelectric materials—mainly bulk ceramic types. The production of standards, particularly international ones, is a long process. The existence or not of a standard in a particular area is not solely because of the need for such a standard, but is due to the concerted effort of individuals. Documents must be kept current, and may be withdrawn or cancelled if there is nobody prepared to maintain it after publication. There are strong groups for piezoelectric materials standards in Europe (CENELEC) and America (IEEE-UFFC), but some of the most quoted standards have been withdrawn (IEEE 176-1987 [1], IEEE 180-1986, MIL-STD 1376B (SH)). An updated and regularly reviewed set of standards can be found at http://www.piezoinstitute.com.
Advances in Applied Ceramics, Mar 1, 2010
Journal of physics, Nov 29, 2013
ABSTRACT A vertical levitation electrostatic comb drive actuator was manufactured for the purpose... more ABSTRACT A vertical levitation electrostatic comb drive actuator was manufactured for the purpose of measuring piezoelectric coefficients in small-scale materials and devices. Previous modelling work on comb drive levitation has focussed on control of the levitation in standard poly-silicon devices in order to minimize effects on lateral modes of operation required for the accelerometer and gyroscope applications. The actuator developed in this study was manufactured using a 20 μm electroplated Ni process with a 25 μm trench created beneath the released structure through chemical wet etching. A finite element analysis using ZINC was used to model electrostatic potential around a cross section of one static and one movable electrode, from which the net levitation force per unit electrode was calculated. The model was first verified using the electrode geometry from previously studied systems, and then used to study the variation of force as a function of decreasing substrate-electrode distance. With the top electrode surfaces collinear the calculated force density is 0.00651 epsilon0V2Mμm-1, equivalent to a total force for the device of 36.4 μN at an applied voltage of VM=100 V, just 16% larger than the observed value. The measured increase in force with distance was smaller than predicted with the FEA, due to the geometry of the device in which the electrodes at the anchored ends of the supporting spring structure displace by a smaller amount than those at the centre.
Journal of the American Ceramic Society, Apr 1, 2014
ABSTRACT Single crystal (1 − x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 [PMN–xPT] (x = 0.32) is a relaxor-ferroel... more ABSTRACT Single crystal (1 − x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 [PMN–xPT] (x = 0.32) is a relaxor-ferroelectric material known to exhibit ‘giant’ piezoelectric behavior, with achievable strains in excess of 1% for samples of certain particular crystallographic orientations and chemical compositions close to the morphotropic phase boundary. In this study, we investigate the electric field-induced structural phase transitions in single crystal PMN–0.32PT with time-of-flight neutron diffraction and macroscopic electrical polarization measurements, and show that both the frequency of the applied ac field and the temperature of the sample are critical factors in determining these phase transition fields.
Journal of the American Ceramic Society, Jul 1, 2008
Ferroelectrics, Oct 21, 2008
This guide is intended to help people wanting to do finite element analysis of piezoelectric mate... more This guide is intended to help people wanting to do finite element analysis of piezoelectric materials by answering some of the questions that are particular to piezoelectric materials. The document is not intended as a complete beginners guide for finite element analysis in general as it is better dealt with by the individual software producers. The guide is based around the commercial package ANSYS as this is a popular package amongst piezoelectric material users, however much of the information will still be useful to users of other finite element codes.