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September 25, 2013

Mtg: Magnetism in Curved Surfaces

by @ 8:15 pm. Filed under ALL, NanoEngineering, Optics/Displays, Semiconductors
 

WEDNESDAY October 2, 2013
OEB Magnetics
Subject:
Speaker: Denys Makarov, Leibniz Institute for Solid State and Materials Research Dresden
Time: 3:00 PM
Cost: none
Place: Lawrence Berkeley Natl Lab, Berkeley
RSVP: Please respond by by Sept 30 by email with name, company to Peter Fischer, peter.fischer@ieee.org,
Web: ewh.ieee.org/r6/oeb/mag

Flexible, stretchable, and printable electronics is a dynamically developing research area with already a variety of commercially available devices.  Shapeable electronics and optoelectronics have been developed already for a few years.  Very recently, we added a new member to this family – shapeable (stretchable and printable) magnetoelectronics.  This development paves the way towards a unique class of devices with important functionality being not only stretchable and fast, but also with the ability to react and respond to a magnetic field.  We sucessfully fabricated layered magnetic structures revealing a giant magnetoresistance (GMR) effect on free-standing elastic Poly(dimethylsiloxane) (PDMS) membranes. The performance of GMR sensors on rigid silicon and on free-standing PDMS is similar and does not change with tensile deformations of up to 29% revealing a top sensitivity of 0.8 %/Oe..  These highly stretchable and highly sensitive elements are demanded for novel application fields like smart skin and flexible and stretchable consumer electronics equipped with magnetic functionalities.  The boost of progress in the fabrication of those shapeable magnetic nanomembranes has triggered the interest in fundamental aspects of magnetism in curved geometries.  Recent advances in nanofabrication allowed us to realize the first artificial complex helimagnetic-like configurations, namely hollow-bar-, corkscrew-, and radial-magnetized 3D micro-helix coils.  From a theoretical point of view, radial magnetized architectures like Swiss roll structures lack inversion- as well as time-reversal symmetry and are therefore characterized by a ferro-toroidic order.  The induction of a finite toroidal moment by nanofabrication techniques could lead to new insights on this elusive type of long-range order and it’s intimately role in mutiferroic behavior.
In this talk, I will review the recent advances in the field of curved magnetic nanomembranes and emergent applications of this novel technology.

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