Multilayer graphene fundamental wave mixer under DC voltage bias

The converse magnetoelectric effect of an asymmetric Piezo-fiber/Metglas bilayer laminate composite subjected to DC electric voltage and magnetic field biases is presented. The experimental results indicate that positive voltages applied to the Piezo-fiber layer produce large tensile strains in the Piezo-fiber layer with relatively small compressive strains in the Metglas layer. The influence of DC electric voltage bias on the converse magnetoelectric effect is studies and it is found that an optimal DC voltage bias exists to maximize the CME coefficient related to the “jumping” stress/strain in the Metglas. The optimum DC magnetic field bias is shift by applying DC voltage biases and the magnitude of converse magnetoelectric response can be electrically tuned.

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Influence of DC Voltage Bias on the Converse Magnetoelectric Effect Response in PZT/Terfenol-D/PZT Laminate Composites

ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, Volume 2 ◽

10.1115/smasis2010-3812 ◽

2010 ◽

Author(s):

Joshua L. Hockel ◽

Tao Wu ◽

Gregory P. Carman

Keyword(s):

Experimental Data ◽

Mechanical Stress ◽

Applied Voltage ◽

Magnetoelectric Effect ◽

Laminate Composites ◽

Dc Voltage ◽

Voltage Bias

The converse magnetoelectric effect (CME) response of a Pb(Zr0.52Ti0.48)O3 (PZT)/ Tb0.30Dy0.7Fe2 (Terfenol-D)/PZT laminate to applied DC voltage bias has been investigated. Experimental data demonstrates that the CME coefficient αCME is highly dependent on applied voltage bias. The voltage bias is shown to increase the piezomagnetic coefficient δλ/δB of the Terfenol-D and by extension the αCME, however an optimal αCME has yet to be identified. The ME laminate exhibits considerable gains in αCME (up to 100%) due in part to the improved magnetostrictive response of Terfenol-D under piezoelectric-induced mechanical stress.

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In-Situ Contact Potential Measurement in Hard Disk Drives Using Head Disk Interface Voltage Control

2014 Conference on Information Storage and Processing Systems ◽

10.1115/isps2014-6994 ◽

2014 ◽

Cited By ~ 3

Author(s):

Aravind N. Murthy ◽

Remmelt Pit ◽

Karl A. Flechsig

Keyword(s):

Hard Disk Drives ◽

Hard Disk ◽

Flying Height ◽

Disk Drives ◽

Head Disk Interface ◽

Contact Potential ◽

Potential Measurement ◽

Dc Voltage ◽

Disk Interface ◽

Voltage Bias

There is an inherent contact potential difference between the head and the disk surfaces in hard disk drives (HDD’s). Current HDD’s use thermal fly-height control (TFC) during read/write operations. In this study, we show a method to determine the contact potential for the head disk interface (HDI) using TFC technology. We utilize TFC to measure the flying height of the slider via touchdown power by applying a DC voltage bias to either the head or the disk or both. The DC voltage condition where the TFC clearance is maximized corresponds to the balancing of the HDI contact potential. In other words, the opposite polarity of that DC voltage bias condition is the HDI contact potential. Additionally, we show that the contact potential of HDI can be determined by either applying the DC voltage bias to the head or to the disk.

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