Browsing by Author "Yang, Su-Chul"
Now showing 1 - 6 of 6
Results Per Page
Sort Options
- Dimensionally gradient magnetoelectric bimorph structure exhibiting wide frequency and magnetic dc bias operating rangePark, Chee-Sung; Ahn, Cheol-Woo; Yang, Su-Chul; Priya, Shashank (American Institute of Physics, 2009-12-01)We report results on a dimensionally gradient magnetoelectric (ME) sensor that demonstrates high performance over a wide frequency range and a magnetic dc bias operating in the longitudinal-transversal mode. The design of the sensor is based on a piezoelectric bimorph structure and utilizes a laminate configuration with Pb(Zn1/3Nb2/3)(0.2)(Zr0.5Ti0.5)(0.8)O-3 and Metglas as material layers. The wide-band behavior was characterized by a flat ME response over a wide range of magnetic dc biases corresponding to 60-215 Oe and frequencies corresponding to 7-22 kHz. By using tip mass, the wide-band frequency response was shifted to a lower frequency range of 5-14 kHz. The results show that the operating frequency range of the sensor can be easily shifted by changing the tip mass at the end of the composite.
- Magnetoelectric Interactions in Lead-Based and Lead-Free CompositesBichurin, Mirza I.; Petrov, Vladimir M.; Zakharov, Anatoly; Kovalenko, Denis; Yang, Su-Chul; Maurya, Deepam; Bedekar, Vishwas; Priya, Shashank (MDPI, 2011-04-06)Magnetoelectric (ME) composites that simultaneously exhibit ferroelectricity and ferromagnetism have recently gained significant attention as evident by the increasing number of publications. These research activities are direct results of the fact that multiferroic magnetoelectrics offer significant technological promise for multiple devices. Appropriate choice of phases with co-firing capability, magnetostriction and piezoelectric coefficient, such as Ni-PZT and NZFO-PZT, has resulted in fabrication of prototype components that promise transition. In this manuscript, we report the properties of Ni-PZT and NZFO-PZT composites in terms of ME voltage coefficients as a function of frequency and magnetic DC bias. In order to overcome the problem of toxicity of lead, we have conducted experiments with Pb-free piezoelectric compositions. Results are presented on the magnetoelectric performance of Ni-NKN, Ni-NBTBT and NZFO-NKN, NZFO-NBTBT systems illustrating their importance as an environmentally friendly alternative.
- Room-temperature magnetoelectric coupling in single-phase BaTiO3-BiFeO3 systemYang, Su-Chul; Kumar, Ashok; Petkov, Valeri; Priya, Shashank (American Institute of Physics, 2013-04-14)In this paper, single-phase multiferroic ceramics of (1 - x) BaTiO3 - x BiFeO3 (BT - x BFO) were synthesized by solid-solution method in the wide range of material composition (x = 0.025 - 1.0). The changes in crystal structure were confirmed via X-ray diffractions (XRD) and atomic pair distribution functions (PDFs). The room-temperature ME coupling was found to exhibit significant magnitude in the narrow composition window (x = 0.71 - 0.8) where the average crystal structure was found to be rhombohedral. Especially, the BT - 0.725 BFO ceramics containing local monoclinic distortions within rhombohedral phase were found to exhibit high room-temperature ME coefficient (alpha(ME)) of 0.87mV/cm.Oe with high piezoelectric properties (g(33) = 18.5 x 10 mV m N-1 and d(33) = 124 pC N-1). We believe that the high room-temperature ME coupling in single-phase lead-free BT-BFO ceramics provides a possibility of developing electrically or magnetically tunable thin-film devices. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4799591]
- Self-biased converse magnetoelectric effectYang, Su-Chul; Cho, Kyung-Hoon; Park, Chee-Sung; Priya, Shashank (AIP Publishing, 2011-11-01)In this letter, we investigate the direct magnetoelectric (DME) and converse magnetoelectric (CME) effects in three-phase metal-ceramic laminate composites. Longitudinally poled and transversely magnetized (L-T) laminate was fabricated by bonding nickel plates between the two particulate magnetoelectric (ME) composite layers of composition 0.8 (0.948 K(0.5)Na(0.5)NbO(3) - 0.052 LiSbO(3)) - 0.2 (Ni(0.8)Zn(0.2)Fe(2)O(4)) (KNNLS-NZF). Under off-resonance condition, the laminates exhibited hysteretic DME and CME responses as a function of applied bias field (H(bias)). Self-biased effect characterized by non-zero ME response at zero H(bias) was observed. The self-biased DME and CME properties were found to be enhanced under resonance conditions. Without external H(bias), magnetic induction switching was possible by applying AC voltage. These results provide the possibility of using self-biased CME effect in electrically controlled memory devices and magnetic flux control devices. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3662420]
- Self-biased magnetoelectric response in three-phase laminatesYang, Su-Chul; Park, Chee-Sung; Cho, Kyung-Hoon; Priya, Shashank (American Institute of Physics, 2010-11-01)This study reports the experimental observation and analysis of self-biased magnetoelectric (ME) effect in three-phase laminates. The 2-2 L-T mode laminates were fabricated by attaching nickel (Ni) plates and ME particulate composite plates having 3-0 connectivity with 0.948Na(0.5)K(0.5)NbO(3)-0.052LiSbO(3) (NKNLS) matrix and Ni(0.8)Zn(0.2)Fe(2)O(4) (NZF) dispersant. The presence of two types of ferromagnetic materials, Ni and NZF, results in built-in magnetic bias due to difference in their magnetic susceptibilities and coercivity. This built-in bias (H(bias)) provides finite ME effect at zero applied magnetic dc field. The ME response of bending mode trilayer laminate NKNLS-NZF/Ni/NKNLS-NZF in off-resonance and on-resonance conditions was shown to be mathematical combination of the trilayers with configuration NKNLS-NZF/Ni/NKNLS-NZF and NKNLS/Ni/NKNLS representing contributions from magnetic interaction and bending strain. (C) 2010 American Institute of Physics. [doi:10.1063/1.3493154]
- Tunable self-biased magnetoelectric response in homogenous laminatesZhou, Yuan; Yang, Su-Chul; Apo, Daniel J.; Maurya, Deepam; Priya, Shashank (AIP Publishing, 2012-12-01)In this study, we demonstrate self-biased magnetoelectric effect in homogenous two-phase magnetostrictive-piezoelectric laminates. Our results illustrate the method for tuning the magnitude of self-bias effect and provide understanding behind the hysteretic changes. We model this phenomenon by considering the magnetization hysteresis with shape-induced demagnetization effect. The self-biased response was found to be directly related to the nature of magnetization and can be tuned by variation in demagnetization state and the resultant differential magnetic flux distribution. These results present significant advancement toward development of AC magnetic field sensor and magnetoelectric composite based on-chip devices by eliminating the need for DC bias. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4769365]